diff --git a/.drone.yml b/.drone.yml
index 4f84d7fa..8a9f8877 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -347,3 +347,19 @@ steps:
   image: golang:1.15
   commands:
   - make coverage
+
+---
+kind: pipeline
+name: release-tag
+trigger:
+  event:
+    - tag
+steps:
+- name: release-tag-gitea
+  pull: always
+  image: plugins/gitea-release:latest
+  settings:
+    base_url: https://gitea.com
+    title: '${DRONE_TAG} is released'
+    api_key:
+      from_secret: gitea_token
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 13e721ec..cd567b27 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,41 @@
 This changelog goes through all the changes that have been made in each release
 without substantial changes to our git log.
 
+## [1.1.2](https://gitea.com/xorm/xorm/releases/tag/1.1.2) - 2021-07-04
+
+* BUILD
+  * Add release tag (#1966)
+
+## [1.1.1](https://gitea.com/xorm/xorm/releases/tag/1.1.1) - 2021-07-03
+
+* BUGFIXES
+  * Ignore comments when deciding when to replace question marks. #1954 (#1955)
+  * Fix bug didn't reset statement on update (#1939)
+  * Fix create table with struct missing columns (#1938)
+  * Fix #929 (#1936)
+  * Fix exist (#1921)
+* ENHANCEMENTS
+  * Improve get field value of bean (#1961)
+  * refactor splitTag function (#1960)
+  * Fix #1663 (#1952)
+  * fix pg GetColumns missing comment (#1949)
+  * Support build flag jsoniter to replace default json (#1916)
+  * refactor exprParam (#1825)
+  * Add DBVersion (#1723)
+* TESTING
+  * Add test to confirm #1247 resolved (#1951)
+  * Add test for dump table with default value (#1950)
+  * Test for #1486 (#1942)
+  * Add sync tests to confirm #539 is gone (#1937)
+  * test for unsigned int32 (#1923)
+  * Add tests for array store (#1922)
+* BUILD
+  * Remove mymysql from ci (#1928)
+* MISC
+  * fix lint (#1953)
+  * Compitable with cockroach (#1930)
+  * Replace goracle  with godror (#1914)
+
 ## [1.1.0](https://gitea.com/xorm/xorm/releases/tag/1.1.0) - 2021-05-14
 
 * FEATURES
diff --git a/Makefile b/Makefile
index bf71b0f4..1bdd44c9 100644
--- a/Makefile
+++ b/Makefile
@@ -138,7 +138,7 @@ test: go-check
 test-cockroach: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -db=postgres -schema='$(TEST_COCKROACH_SCHEMA)' -cache=$(TEST_CACHE_ENABLE) \
 	-conn_str="postgres://$(TEST_COCKROACH_USERNAME):$(TEST_COCKROACH_PASSWORD)@$(TEST_COCKROACH_HOST)/$(TEST_COCKROACH_DBNAME)?sslmode=disable&experimental_serial_normalization=sql_sequence" \
-	-ignore_update_limit=true -coverprofile=cockroach.$(TEST_COCKROACH_SCHEMA).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	-ignore_update_limit=true -coverprofile=cockroach.$(TEST_COCKROACH_SCHEMA).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PHONY: test-cockroach\#%
 test-cockroach\#%: go-check
@@ -152,7 +152,7 @@ test-mssql: go-check
 	-conn_str="server=$(TEST_MSSQL_HOST);user id=$(TEST_MSSQL_USERNAME);password=$(TEST_MSSQL_PASSWORD);database=$(TEST_MSSQL_DBNAME)" \
 	-default_varchar=$(TEST_MSSQL_DEFAULT_VARCHAR) -default_char=$(TEST_MSSQL_DEFAULT_CHAR) \
 	-do_nvarchar_override_test=$(TEST_MSSQL_DO_NVARCHAR_OVERRIDE_TEST) \
-	-coverprofile=mssql.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	-coverprofile=mssql.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PNONY: test-mssql\#%
 test-mssql\#%: go-check
@@ -166,7 +166,7 @@ test-mssql\#%: go-check
 test-mymysql: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -db=mymysql -cache=$(TEST_CACHE_ENABLE) -quote=$(TEST_QUOTE_POLICY) \
 	-conn_str="tcp:$(TEST_MYSQL_HOST)*$(TEST_MYSQL_DBNAME)/$(TEST_MYSQL_USERNAME)/$(TEST_MYSQL_PASSWORD)" \
-	-coverprofile=mymysql.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	-coverprofile=mymysql.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PNONY: test-mymysql\#%
 test-mymysql\#%: go-check
@@ -178,7 +178,7 @@ test-mymysql\#%: go-check
 test-mysql: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -db=mysql -cache=$(TEST_CACHE_ENABLE) -quote=$(TEST_QUOTE_POLICY) \
 	-conn_str="$(TEST_MYSQL_USERNAME):$(TEST_MYSQL_PASSWORD)@tcp($(TEST_MYSQL_HOST))/$(TEST_MYSQL_DBNAME)?charset=$(TEST_MYSQL_CHARSET)" \
-	-coverprofile=mysql.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	-coverprofile=mysql.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PHONY: test-mysql\#%
 test-mysql\#%: go-check
@@ -190,7 +190,7 @@ test-mysql\#%: go-check
 test-postgres: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -db=postgres -schema='$(TEST_PGSQL_SCHEMA)' -cache=$(TEST_CACHE_ENABLE) \
 	-conn_str="postgres://$(TEST_PGSQL_USERNAME):$(TEST_PGSQL_PASSWORD)@$(TEST_PGSQL_HOST)/$(TEST_PGSQL_DBNAME)?sslmode=disable" \
-	-quote=$(TEST_QUOTE_POLICY) -coverprofile=postgres.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	-quote=$(TEST_QUOTE_POLICY) -coverprofile=postgres.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PHONY: test-postgres\#%
 test-postgres\#%: go-check
@@ -201,12 +201,12 @@ test-postgres\#%: go-check
 .PHONY: test-sqlite3
 test-sqlite3: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -cache=$(TEST_CACHE_ENABLE) -db=sqlite3 -conn_str="./test.db?cache=shared&mode=rwc" \
-	 -quote=$(TEST_QUOTE_POLICY) -coverprofile=sqlite3.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	 -quote=$(TEST_QUOTE_POLICY) -coverprofile=sqlite3.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PHONY: test-sqlite3-schema
 test-sqlite3-schema: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -schema=xorm -cache=$(TEST_CACHE_ENABLE) -db=sqlite3 -conn_str="./test.db?cache=shared&mode=rwc" \
-	 -quote=$(TEST_QUOTE_POLICY) -coverprofile=sqlite3.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	 -quote=$(TEST_QUOTE_POLICY) -coverprofile=sqlite3.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PHONY: test-sqlite3\#%
 test-sqlite3\#%: go-check
@@ -216,12 +216,12 @@ test-sqlite3\#%: go-check
 .PHONY: test-sqlite
 test-sqlite: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -cache=$(TEST_CACHE_ENABLE) -db=sqlite -conn_str="./test.db?cache=shared&mode=rwc" \
-	 -quote=$(TEST_QUOTE_POLICY) -coverprofile=sqlite.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	 -quote=$(TEST_QUOTE_POLICY) -coverprofile=sqlite.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PHONY: test-sqlite-schema
 test-sqlite-schema: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -schema=xorm -cache=$(TEST_CACHE_ENABLE) -db=sqlite -conn_str="./test.db?cache=shared&mode=rwc" \
-	 -quote=$(TEST_QUOTE_POLICY) -coverprofile=sqlite.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	 -quote=$(TEST_QUOTE_POLICY) -coverprofile=sqlite.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PHONY: test-sqlite\#%
 test-sqlite\#%: go-check
@@ -233,7 +233,7 @@ test-sqlite\#%: go-check
 test-tidb: go-check
 	$(GO) test $(INTEGRATION_PACKAGES) -v -race -db=mysql -cache=$(TEST_CACHE_ENABLE) -ignore_select_update=true \
 	-conn_str="$(TEST_TIDB_USERNAME):$(TEST_TIDB_PASSWORD)@tcp($(TEST_TIDB_HOST))/$(TEST_TIDB_DBNAME)" \
-	-quote=$(TEST_QUOTE_POLICY) -coverprofile=tidb.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic
+	-quote=$(TEST_QUOTE_POLICY) -coverprofile=tidb.$(TEST_QUOTE_POLICY).$(TEST_CACHE_ENABLE).coverage.out -covermode=atomic -timeout=20m
 
 .PHONY: test-tidb\#%
 test-tidb\#%: go-check
diff --git a/README.md b/README.md
index 67380839..40826f13 100644
--- a/README.md
+++ b/README.md
@@ -245,35 +245,38 @@ for rows.Next() {
 
 ```Go
 affected, err := engine.ID(1).Update(&user)
-// UPDATE user SET ... Where id = ?
+// UPDATE user SET ... WHERE id = ?
 
 affected, err := engine.Update(&user, &User{Name:name})
-// UPDATE user SET ... Where name = ?
+// UPDATE user SET ... WHERE name = ?
 
 var ids = []int64{1, 2, 3}
 affected, err := engine.In("id", ids).Update(&user)
-// UPDATE user SET ... Where id IN (?, ?, ?)
+// UPDATE user SET ... WHERE id IN (?, ?, ?)
 
 // force update indicated columns by Cols
 affected, err := engine.ID(1).Cols("age").Update(&User{Name:name, Age: 12})
-// UPDATE user SET age = ?, updated=? Where id = ?
+// UPDATE user SET age = ?, updated=? WHERE id = ?
 
 // force NOT update indicated columns by Omit
 affected, err := engine.ID(1).Omit("name").Update(&User{Name:name, Age: 12})
-// UPDATE user SET age = ?, updated=? Where id = ?
+// UPDATE user SET age = ?, updated=? WHERE id = ?
 
 affected, err := engine.ID(1).AllCols().Update(&user)
-// UPDATE user SET name=?,age=?,salt=?,passwd=?,updated=? Where id = ?
+// UPDATE user SET name=?,age=?,salt=?,passwd=?,updated=? WHERE id = ?
 ```
 
 * `Delete` delete one or more records, Delete MUST have condition
 
 ```Go
 affected, err := engine.Where(...).Delete(&user)
-// DELETE FROM user Where ...
+// DELETE FROM user WHERE ...
 
 affected, err := engine.ID(2).Delete(&user)
-// DELETE FROM user Where id = ?
+// DELETE FROM user WHERE id = ?
+
+affected, err := engine.Table("user").Where(...).Delete()
+// DELETE FROM user WHERE ...
 ```
 
 * `Count` count records
diff --git a/README_CN.md b/README_CN.md
index 80245dd3..06706417 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -271,6 +271,9 @@ affected, err := engine.Where(...).Delete(&user)
 
 affected, err := engine.ID(2).Delete(&user)
 // DELETE FROM user Where id = ?
+
+affected, err := engine.Table("user").Where(...).Delete()
+// DELETE FROM user WHERE ...
 ```
 
 * `Count` 获取记录条数
diff --git a/convert.go b/convert.go
index b7f30cad..c3eb4de9 100644
--- a/convert.go
+++ b/convert.go
@@ -5,12 +5,17 @@
 package xorm
 
 import (
+	"database/sql"
 	"database/sql/driver"
+	"encoding/json"
 	"errors"
 	"fmt"
+	"math/big"
 	"reflect"
 	"strconv"
 	"time"
+
+	"xorm.io/xorm/convert"
 )
 
 var errNilPtr = errors.New("destination pointer is nil") // embedded in descriptive error
@@ -37,6 +42,12 @@ func asString(src interface{}) string {
 		return v
 	case []byte:
 		return string(v)
+	case *sql.NullString:
+		return v.String
+	case *sql.NullInt32:
+		return fmt.Sprintf("%d", v.Int32)
+	case *sql.NullInt64:
+		return fmt.Sprintf("%d", v.Int64)
 	}
 	rv := reflect.ValueOf(src)
 	switch rv.Kind() {
@@ -54,31 +65,326 @@ func asString(src interface{}) string {
 	return fmt.Sprintf("%v", src)
 }
 
-func asBytes(buf []byte, rv reflect.Value) (b []byte, ok bool) {
+func asInt64(src interface{}) (int64, error) {
+	switch v := src.(type) {
+	case int:
+		return int64(v), nil
+	case int16:
+		return int64(v), nil
+	case int32:
+		return int64(v), nil
+	case int8:
+		return int64(v), nil
+	case int64:
+		return v, nil
+	case uint:
+		return int64(v), nil
+	case uint8:
+		return int64(v), nil
+	case uint16:
+		return int64(v), nil
+	case uint32:
+		return int64(v), nil
+	case uint64:
+		return int64(v), nil
+	case []byte:
+		return strconv.ParseInt(string(v), 10, 64)
+	case string:
+		return strconv.ParseInt(v, 10, 64)
+	case *sql.NullString:
+		return strconv.ParseInt(v.String, 10, 64)
+	case *sql.NullInt32:
+		return int64(v.Int32), nil
+	case *sql.NullInt64:
+		return int64(v.Int64), nil
+	}
+
+	rv := reflect.ValueOf(src)
 	switch rv.Kind() {
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return strconv.AppendInt(buf, rv.Int(), 10), true
+		return rv.Int(), nil
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
-		return strconv.AppendUint(buf, rv.Uint(), 10), true
-	case reflect.Float32:
-		return strconv.AppendFloat(buf, rv.Float(), 'g', -1, 32), true
-	case reflect.Float64:
-		return strconv.AppendFloat(buf, rv.Float(), 'g', -1, 64), true
-	case reflect.Bool:
-		return strconv.AppendBool(buf, rv.Bool()), true
+		return int64(rv.Uint()), nil
+	case reflect.Float64, reflect.Float32:
+		return int64(rv.Float()), nil
 	case reflect.String:
-		s := rv.String()
-		return append(buf, s...), true
+		return strconv.ParseInt(rv.String(), 10, 64)
 	}
-	return
+	return 0, fmt.Errorf("unsupported value %T as int64", src)
+}
+
+func asUint64(src interface{}) (uint64, error) {
+	switch v := src.(type) {
+	case int:
+		return uint64(v), nil
+	case int16:
+		return uint64(v), nil
+	case int32:
+		return uint64(v), nil
+	case int8:
+		return uint64(v), nil
+	case int64:
+		return uint64(v), nil
+	case uint:
+		return uint64(v), nil
+	case uint8:
+		return uint64(v), nil
+	case uint16:
+		return uint64(v), nil
+	case uint32:
+		return uint64(v), nil
+	case uint64:
+		return v, nil
+	case []byte:
+		return strconv.ParseUint(string(v), 10, 64)
+	case string:
+		return strconv.ParseUint(v, 10, 64)
+	case *sql.NullString:
+		return strconv.ParseUint(v.String, 10, 64)
+	case *sql.NullInt32:
+		return uint64(v.Int32), nil
+	case *sql.NullInt64:
+		return uint64(v.Int64), nil
+	}
+
+	rv := reflect.ValueOf(src)
+	switch rv.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return uint64(rv.Int()), nil
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return uint64(rv.Uint()), nil
+	case reflect.Float64, reflect.Float32:
+		return uint64(rv.Float()), nil
+	case reflect.String:
+		return strconv.ParseUint(rv.String(), 10, 64)
+	}
+	return 0, fmt.Errorf("unsupported value %T as uint64", src)
+}
+
+func asFloat64(src interface{}) (float64, error) {
+	switch v := src.(type) {
+	case int:
+		return float64(v), nil
+	case int16:
+		return float64(v), nil
+	case int32:
+		return float64(v), nil
+	case int8:
+		return float64(v), nil
+	case int64:
+		return float64(v), nil
+	case uint:
+		return float64(v), nil
+	case uint8:
+		return float64(v), nil
+	case uint16:
+		return float64(v), nil
+	case uint32:
+		return float64(v), nil
+	case uint64:
+		return float64(v), nil
+	case []byte:
+		return strconv.ParseFloat(string(v), 64)
+	case string:
+		return strconv.ParseFloat(v, 64)
+	case *sql.NullString:
+		return strconv.ParseFloat(v.String, 64)
+	case *sql.NullInt32:
+		return float64(v.Int32), nil
+	case *sql.NullInt64:
+		return float64(v.Int64), nil
+	case *sql.NullFloat64:
+		return v.Float64, nil
+	}
+
+	rv := reflect.ValueOf(src)
+	switch rv.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return float64(rv.Int()), nil
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return float64(rv.Uint()), nil
+	case reflect.Float64, reflect.Float32:
+		return float64(rv.Float()), nil
+	case reflect.String:
+		return strconv.ParseFloat(rv.String(), 64)
+	}
+	return 0, fmt.Errorf("unsupported value %T as int64", src)
+}
+
+func asBigFloat(src interface{}) (*big.Float, error) {
+	res := big.NewFloat(0)
+	switch v := src.(type) {
+	case int:
+		res.SetInt64(int64(v))
+		return res, nil
+	case int16:
+		res.SetInt64(int64(v))
+		return res, nil
+	case int32:
+		res.SetInt64(int64(v))
+		return res, nil
+	case int8:
+		res.SetInt64(int64(v))
+		return res, nil
+	case int64:
+		res.SetInt64(int64(v))
+		return res, nil
+	case uint:
+		res.SetUint64(uint64(v))
+		return res, nil
+	case uint8:
+		res.SetUint64(uint64(v))
+		return res, nil
+	case uint16:
+		res.SetUint64(uint64(v))
+		return res, nil
+	case uint32:
+		res.SetUint64(uint64(v))
+		return res, nil
+	case uint64:
+		res.SetUint64(uint64(v))
+		return res, nil
+	case []byte:
+		res.SetString(string(v))
+		return res, nil
+	case string:
+		res.SetString(v)
+		return res, nil
+	case *sql.NullString:
+		if v.Valid {
+			res.SetString(v.String)
+			return res, nil
+		}
+		return nil, nil
+	case *sql.NullInt32:
+		if v.Valid {
+			res.SetInt64(int64(v.Int32))
+			return res, nil
+		}
+		return nil, nil
+	case *sql.NullInt64:
+		if v.Valid {
+			res.SetInt64(int64(v.Int64))
+			return res, nil
+		}
+		return nil, nil
+	}
+
+	rv := reflect.ValueOf(src)
+	switch rv.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		res.SetInt64(rv.Int())
+		return res, nil
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		res.SetUint64(rv.Uint())
+		return res, nil
+	case reflect.Float64, reflect.Float32:
+		res.SetFloat64(rv.Float())
+		return res, nil
+	case reflect.String:
+		res.SetString(rv.String())
+		return res, nil
+	}
+	return nil, fmt.Errorf("unsupported value %T as big.Float", src)
+}
+
+func asBytes(src interface{}) ([]byte, bool) {
+	switch t := src.(type) {
+	case []byte:
+		return t, true
+	case *sql.NullString:
+		if !t.Valid {
+			return nil, true
+		}
+		return []byte(t.String), true
+	case *sql.RawBytes:
+		return *t, true
+	}
+
+	rv := reflect.ValueOf(src)
+
+	switch rv.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return strconv.AppendInt(nil, rv.Int(), 10), true
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return strconv.AppendUint(nil, rv.Uint(), 10), true
+	case reflect.Float32:
+		return strconv.AppendFloat(nil, rv.Float(), 'g', -1, 32), true
+	case reflect.Float64:
+		return strconv.AppendFloat(nil, rv.Float(), 'g', -1, 64), true
+	case reflect.Bool:
+		return strconv.AppendBool(nil, rv.Bool()), true
+	case reflect.String:
+		return []byte(rv.String()), true
+	}
+	return nil, false
+}
+
+func asTime(src interface{}, dbLoc *time.Location, uiLoc *time.Location) (*time.Time, error) {
+	switch t := src.(type) {
+	case string:
+		return convert.String2Time(t, dbLoc, uiLoc)
+	case *sql.NullString:
+		if !t.Valid {
+			return nil, nil
+		}
+		return convert.String2Time(t.String, dbLoc, uiLoc)
+	case []uint8:
+		if t == nil {
+			return nil, nil
+		}
+		return convert.String2Time(string(t), dbLoc, uiLoc)
+	case *sql.NullTime:
+		if !t.Valid {
+			return nil, nil
+		}
+		z, _ := t.Time.Zone()
+		if len(z) == 0 || t.Time.Year() == 0 || t.Time.Location().String() != dbLoc.String() {
+			tm := time.Date(t.Time.Year(), t.Time.Month(), t.Time.Day(), t.Time.Hour(),
+				t.Time.Minute(), t.Time.Second(), t.Time.Nanosecond(), dbLoc).In(uiLoc)
+			return &tm, nil
+		}
+		tm := t.Time.In(uiLoc)
+		return &tm, nil
+	case *time.Time:
+		z, _ := t.Zone()
+		if len(z) == 0 || t.Year() == 0 || t.Location().String() != dbLoc.String() {
+			tm := time.Date(t.Year(), t.Month(), t.Day(), t.Hour(),
+				t.Minute(), t.Second(), t.Nanosecond(), dbLoc).In(uiLoc)
+			return &tm, nil
+		}
+		tm := t.In(uiLoc)
+		return &tm, nil
+	case time.Time:
+		z, _ := t.Zone()
+		if len(z) == 0 || t.Year() == 0 || t.Location().String() != dbLoc.String() {
+			tm := time.Date(t.Year(), t.Month(), t.Day(), t.Hour(),
+				t.Minute(), t.Second(), t.Nanosecond(), dbLoc).In(uiLoc)
+			return &tm, nil
+		}
+		tm := t.In(uiLoc)
+		return &tm, nil
+	case int:
+		tm := time.Unix(int64(t), 0).In(uiLoc)
+		return &tm, nil
+	case int64:
+		tm := time.Unix(t, 0).In(uiLoc)
+		return &tm, nil
+	case *sql.NullInt64:
+		tm := time.Unix(t.Int64, 0).In(uiLoc)
+		return &tm, nil
+	}
+	return nil, fmt.Errorf("unsupported value %#v as time", src)
 }
 
 // convertAssign copies to dest the value in src, converting it if possible.
 // An error is returned if the copy would result in loss of information.
 // dest should be a pointer type.
-func convertAssign(dest, src interface{}) error {
+func convertAssign(dest, src interface{}, originalLocation *time.Location, convertedLocation *time.Location) error {
 	// Common cases, without reflect.
 	switch s := src.(type) {
+	case *interface{}:
+		return convertAssign(dest, *s, originalLocation, convertedLocation)
 	case string:
 		switch d := dest.(type) {
 		case *string:
@@ -115,7 +421,6 @@ func convertAssign(dest, src interface{}) error {
 			*d = cloneBytes(s)
 			return nil
 		}
-
 	case time.Time:
 		switch d := dest.(type) {
 		case *string:
@@ -143,6 +448,174 @@ func convertAssign(dest, src interface{}) error {
 			*d = nil
 			return nil
 		}
+	case *sql.NullString:
+		switch d := dest.(type) {
+		case *int:
+			if s.Valid {
+				*d, _ = strconv.Atoi(s.String)
+			}
+			return nil
+		case *int64:
+			if s.Valid {
+				*d, _ = strconv.ParseInt(s.String, 10, 64)
+			}
+			return nil
+		case *string:
+			if s.Valid {
+				*d = s.String
+			}
+			return nil
+		case *time.Time:
+			if s.Valid {
+				var err error
+				dt, err := convert.String2Time(s.String, originalLocation, convertedLocation)
+				if err != nil {
+					return err
+				}
+				*d = *dt
+			}
+			return nil
+		case *sql.NullTime:
+			if s.Valid {
+				var err error
+				dt, err := convert.String2Time(s.String, originalLocation, convertedLocation)
+				if err != nil {
+					return err
+				}
+				d.Valid = true
+				d.Time = *dt
+			}
+			return nil
+		case *big.Float:
+			if s.Valid {
+				if d == nil {
+					d = big.NewFloat(0)
+				}
+				d.SetString(s.String)
+			}
+			return nil
+		}
+	case *sql.NullInt32:
+		switch d := dest.(type) {
+		case *int:
+			if s.Valid {
+				*d = int(s.Int32)
+			}
+			return nil
+		case *int8:
+			if s.Valid {
+				*d = int8(s.Int32)
+			}
+			return nil
+		case *int16:
+			if s.Valid {
+				*d = int16(s.Int32)
+			}
+			return nil
+		case *int32:
+			if s.Valid {
+				*d = s.Int32
+			}
+			return nil
+		case *int64:
+			if s.Valid {
+				*d = int64(s.Int32)
+			}
+			return nil
+		}
+	case *sql.NullInt64:
+		switch d := dest.(type) {
+		case *int:
+			if s.Valid {
+				*d = int(s.Int64)
+			}
+			return nil
+		case *int8:
+			if s.Valid {
+				*d = int8(s.Int64)
+			}
+			return nil
+		case *int16:
+			if s.Valid {
+				*d = int16(s.Int64)
+			}
+			return nil
+		case *int32:
+			if s.Valid {
+				*d = int32(s.Int64)
+			}
+			return nil
+		case *int64:
+			if s.Valid {
+				*d = s.Int64
+			}
+			return nil
+		}
+	case *sql.NullFloat64:
+		switch d := dest.(type) {
+		case *int:
+			if s.Valid {
+				*d = int(s.Float64)
+			}
+			return nil
+		case *float64:
+			if s.Valid {
+				*d = s.Float64
+			}
+			return nil
+		}
+	case *sql.NullBool:
+		switch d := dest.(type) {
+		case *bool:
+			if s.Valid {
+				*d = s.Bool
+			}
+			return nil
+		}
+	case *sql.NullTime:
+		switch d := dest.(type) {
+		case *time.Time:
+			if s.Valid {
+				*d = s.Time
+			}
+			return nil
+		case *string:
+			if s.Valid {
+				*d = s.Time.In(convertedLocation).Format("2006-01-02 15:04:05")
+			}
+			return nil
+		}
+	case *NullUint32:
+		switch d := dest.(type) {
+		case *uint8:
+			if s.Valid {
+				*d = uint8(s.Uint32)
+			}
+			return nil
+		case *uint16:
+			if s.Valid {
+				*d = uint16(s.Uint32)
+			}
+			return nil
+		case *uint:
+			if s.Valid {
+				*d = uint(s.Uint32)
+			}
+			return nil
+		}
+	case *NullUint64:
+		switch d := dest.(type) {
+		case *uint64:
+			if s.Valid {
+				*d = s.Uint64
+			}
+			return nil
+		}
+	case *sql.RawBytes:
+		switch d := dest.(type) {
+		case convert.Conversion:
+			return d.FromDB(*s)
+		}
 	}
 
 	var sv reflect.Value
@@ -159,8 +632,7 @@ func convertAssign(dest, src interface{}) error {
 			return nil
 		}
 	case *[]byte:
-		sv = reflect.ValueOf(src)
-		if b, ok := asBytes(nil, sv); ok {
+		if b, ok := asBytes(src); ok {
 			*d = b
 			return nil
 		}
@@ -178,78 +650,76 @@ func convertAssign(dest, src interface{}) error {
 	return convertAssignV(reflect.ValueOf(dest), src)
 }
 
-func convertAssignV(dpv reflect.Value, src interface{}) error {
-	if dpv.Kind() != reflect.Ptr {
-		return errors.New("destination not a pointer")
-	}
-	if dpv.IsNil() {
-		return errNilPtr
-	}
-
-	var sv = reflect.ValueOf(src)
-
-	dv := reflect.Indirect(dpv)
-	if sv.IsValid() && sv.Type().AssignableTo(dv.Type()) {
-		switch b := src.(type) {
-		case []byte:
-			dv.Set(reflect.ValueOf(cloneBytes(b)))
-		default:
-			dv.Set(sv)
-		}
+func convertAssignV(dv reflect.Value, src interface{}) error {
+	if src == nil {
 		return nil
 	}
 
-	if dv.Kind() == sv.Kind() && sv.Type().ConvertibleTo(dv.Type()) {
-		dv.Set(sv.Convert(dv.Type()))
-		return nil
+	if dv.Type().Implements(scannerType) {
+		return dv.Interface().(sql.Scanner).Scan(src)
 	}
 
 	switch dv.Kind() {
 	case reflect.Ptr:
-		if src == nil {
-			dv.Set(reflect.Zero(dv.Type()))
-			return nil
+		if dv.IsNil() {
+			dv.Set(reflect.New(dv.Type().Elem()))
 		}
-
-		dv.Set(reflect.New(dv.Type().Elem()))
-		return convertAssign(dv.Interface(), src)
+		return convertAssignV(dv.Elem(), src)
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		s := asString(src)
-		i64, err := strconv.ParseInt(s, 10, dv.Type().Bits())
+		i64, err := asInt64(src)
 		if err != nil {
 			err = strconvErr(err)
-			return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
+			return fmt.Errorf("converting driver.Value type %T to a %s: %v", src, dv.Kind(), err)
 		}
 		dv.SetInt(i64)
 		return nil
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
-		s := asString(src)
-		u64, err := strconv.ParseUint(s, 10, dv.Type().Bits())
+		u64, err := asUint64(src)
 		if err != nil {
 			err = strconvErr(err)
-			return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
+			return fmt.Errorf("converting driver.Value type %T to a %s: %v", src, dv.Kind(), err)
 		}
 		dv.SetUint(u64)
 		return nil
 	case reflect.Float32, reflect.Float64:
-		s := asString(src)
-		f64, err := strconv.ParseFloat(s, dv.Type().Bits())
+		f64, err := asFloat64(src)
 		if err != nil {
 			err = strconvErr(err)
-			return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
+			return fmt.Errorf("converting driver.Value type %T to a %s: %v", src, dv.Kind(), err)
 		}
 		dv.SetFloat(f64)
 		return nil
 	case reflect.String:
 		dv.SetString(asString(src))
 		return nil
+	case reflect.Bool:
+		b, err := asBool(src)
+		if err != nil {
+			return err
+		}
+		dv.SetBool(b)
+		return nil
+	case reflect.Slice, reflect.Map, reflect.Struct, reflect.Array:
+		data, ok := asBytes(src)
+		if !ok {
+			return fmt.Errorf("onvertAssignV: src cannot be as bytes %#v", src)
+		}
+		if data == nil {
+			return nil
+		}
+		if dv.Kind() != reflect.Ptr {
+			dv = dv.Addr()
+		}
+		return json.Unmarshal(data, dv.Interface())
+	default:
+		return fmt.Errorf("convertAssignV: unsupported Scan, storing driver.Value type %T into type %T", src, dv.Interface())
 	}
-
-	return fmt.Errorf("unsupported Scan, storing driver.Value type %T into type %T", src, dpv.Interface())
 }
 
 func asKind(vv reflect.Value, tp reflect.Type) (interface{}, error) {
 	switch tp.Kind() {
+	case reflect.Ptr:
+		return asKind(vv.Elem(), tp.Elem())
 	case reflect.Int64:
 		return vv.Int(), nil
 	case reflect.Int:
@@ -280,21 +750,47 @@ func asKind(vv reflect.Value, tp reflect.Type) (interface{}, error) {
 			}
 			return v, nil
 		}
-
 	}
 	return nil, fmt.Errorf("unsupported primary key type: %v, %v", tp, vv)
 }
 
-func asBool(bs []byte) (bool, error) {
-	if len(bs) == 0 {
-		return false, nil
+func asBool(src interface{}) (bool, error) {
+	switch v := src.(type) {
+	case bool:
+		return v, nil
+	case *bool:
+		return *v, nil
+	case *sql.NullBool:
+		return v.Bool, nil
+	case int64:
+		return v > 0, nil
+	case int:
+		return v > 0, nil
+	case int8:
+		return v > 0, nil
+	case int16:
+		return v > 0, nil
+	case int32:
+		return v > 0, nil
+	case []byte:
+		if len(v) == 0 {
+			return false, nil
+		}
+		if v[0] == 0x00 {
+			return false, nil
+		} else if v[0] == 0x01 {
+			return true, nil
+		}
+		return strconv.ParseBool(string(v))
+	case string:
+		return strconv.ParseBool(v)
+	case *sql.NullInt64:
+		return v.Int64 > 0, nil
+	case *sql.NullInt32:
+		return v.Int32 > 0, nil
+	default:
+		return false, fmt.Errorf("unknow type %T as bool", src)
 	}
-	if bs[0] == 0x00 {
-		return false, nil
-	} else if bs[0] == 0x01 {
-		return true, nil
-	}
-	return strconv.ParseBool(string(bs))
 }
 
 // str2PK convert string value to primary key value according to tp
@@ -376,3 +872,82 @@ func str2PK(s string, tp reflect.Type) (interface{}, error) {
 	}
 	return v.Interface(), nil
 }
+
+var (
+	_ sql.Scanner = &NullUint64{}
+)
+
+// NullUint64 represents an uint64 that may be null.
+// NullUint64 implements the Scanner interface so
+// it can be used as a scan destination, similar to NullString.
+type NullUint64 struct {
+	Uint64 uint64
+	Valid  bool
+}
+
+// Scan implements the Scanner interface.
+func (n *NullUint64) Scan(value interface{}) error {
+	if value == nil {
+		n.Uint64, n.Valid = 0, false
+		return nil
+	}
+	n.Valid = true
+	var err error
+	n.Uint64, err = asUint64(value)
+	return err
+}
+
+// Value implements the driver Valuer interface.
+func (n NullUint64) Value() (driver.Value, error) {
+	if !n.Valid {
+		return nil, nil
+	}
+	return n.Uint64, nil
+}
+
+var (
+	_ sql.Scanner = &NullUint32{}
+)
+
+// NullUint32 represents an uint32 that may be null.
+// NullUint32 implements the Scanner interface so
+// it can be used as a scan destination, similar to NullString.
+type NullUint32 struct {
+	Uint32 uint32
+	Valid  bool // Valid is true if Uint32 is not NULL
+}
+
+// Scan implements the Scanner interface.
+func (n *NullUint32) Scan(value interface{}) error {
+	if value == nil {
+		n.Uint32, n.Valid = 0, false
+		return nil
+	}
+	n.Valid = true
+	i64, err := asUint64(value)
+	if err != nil {
+		return err
+	}
+	n.Uint32 = uint32(i64)
+	return nil
+}
+
+// Value implements the driver Valuer interface.
+func (n NullUint32) Value() (driver.Value, error) {
+	if !n.Valid {
+		return nil, nil
+	}
+	return int64(n.Uint32), nil
+}
+
+var (
+	_ sql.Scanner = &EmptyScanner{}
+)
+
+// EmptyScanner represents an empty scanner which will ignore the scan
+type EmptyScanner struct{}
+
+// Scan implements sql.Scanner
+func (EmptyScanner) Scan(value interface{}) error {
+	return nil
+}
diff --git a/convert/interface.go b/convert/interface.go
new file mode 100644
index 00000000..b0f28c81
--- /dev/null
+++ b/convert/interface.go
@@ -0,0 +1,49 @@
+// Copyright 2021 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package convert
+
+import (
+	"database/sql"
+	"fmt"
+	"time"
+)
+
+// Interface2Interface converts interface of pointer as interface of value
+func Interface2Interface(userLocation *time.Location, v interface{}) (interface{}, error) {
+	if v == nil {
+		return nil, nil
+	}
+	switch vv := v.(type) {
+	case *int64:
+		return *vv, nil
+	case *int8:
+		return *vv, nil
+	case *sql.NullString:
+		return vv.String, nil
+	case *sql.RawBytes:
+		if len([]byte(*vv)) > 0 {
+			return []byte(*vv), nil
+		}
+		return nil, nil
+	case *sql.NullInt32:
+		return vv.Int32, nil
+	case *sql.NullInt64:
+		return vv.Int64, nil
+	case *sql.NullFloat64:
+		return vv.Float64, nil
+	case *sql.NullBool:
+		if vv.Valid {
+			return vv.Bool, nil
+		}
+		return nil, nil
+	case *sql.NullTime:
+		if vv.Valid {
+			return vv.Time.In(userLocation).Format("2006-01-02 15:04:05"), nil
+		}
+		return "", nil
+	default:
+		return "", fmt.Errorf("convert assign string unsupported type: %#v", vv)
+	}
+}
diff --git a/convert/time.go b/convert/time.go
new file mode 100644
index 00000000..6a53171b
--- /dev/null
+++ b/convert/time.go
@@ -0,0 +1,49 @@
+// Copyright 2021 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package convert
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+
+	"xorm.io/xorm/internal/utils"
+)
+
+// String2Time converts a string to time with original location
+func String2Time(s string, originalLocation *time.Location, convertedLocation *time.Location) (*time.Time, error) {
+	if len(s) == 19 {
+		if s == utils.ZeroTime0 || s == utils.ZeroTime1 {
+			return &time.Time{}, nil
+		}
+		dt, err := time.ParseInLocation("2006-01-02 15:04:05", s, originalLocation)
+		if err != nil {
+			return nil, err
+		}
+		dt = dt.In(convertedLocation)
+		return &dt, nil
+	} else if len(s) == 20 && s[10] == 'T' && s[19] == 'Z' {
+		dt, err := time.ParseInLocation("2006-01-02T15:04:05", s[:19], originalLocation)
+		if err != nil {
+			return nil, err
+		}
+		dt = dt.In(convertedLocation)
+		return &dt, nil
+	} else if len(s) == 25 && s[10] == 'T' && s[19] == '+' && s[22] == ':' {
+		dt, err := time.Parse(time.RFC3339, s)
+		if err != nil {
+			return nil, err
+		}
+		dt = dt.In(convertedLocation)
+		return &dt, nil
+	} else {
+		i, err := strconv.ParseInt(s, 10, 64)
+		if err == nil {
+			tm := time.Unix(i, 0).In(convertedLocation)
+			return &tm, nil
+		}
+	}
+	return nil, fmt.Errorf("unsupported conversion from %s to time", s)
+}
diff --git a/convert/time_test.go b/convert/time_test.go
new file mode 100644
index 00000000..ef01b362
--- /dev/null
+++ b/convert/time_test.go
@@ -0,0 +1,30 @@
+// Copyright 2021 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package convert
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestString2Time(t *testing.T) {
+	expectedLoc, err := time.LoadLocation("Asia/Shanghai")
+	assert.NoError(t, err)
+
+	var kases = map[string]time.Time{
+		"2021-06-06T22:58:20+08:00": time.Date(2021, 6, 6, 22, 58, 20, 0, expectedLoc),
+		"2021-07-11 10:44:00":       time.Date(2021, 7, 11, 18, 44, 0, 0, expectedLoc),
+		"2021-08-10T10:33:04Z":      time.Date(2021, 8, 10, 18, 33, 04, 0, expectedLoc),
+	}
+	for layout, tm := range kases {
+		t.Run(layout, func(t *testing.T) {
+			target, err := String2Time(layout, time.UTC, expectedLoc)
+			assert.NoError(t, err)
+			assert.EqualValues(t, tm, *target)
+		})
+	}
+}
diff --git a/dialects/dialect.go b/dialects/dialect.go
index 325836b4..fc11eac1 100644
--- a/dialects/dialect.go
+++ b/dialects/dialect.go
@@ -42,10 +42,12 @@ func (uri *URI) SetSchema(schema string) {
 type Dialect interface {
 	Init(*URI) error
 	URI() *URI
-	SQLType(*schemas.Column) string
-	FormatBytes(b []byte) string
 	Version(ctx context.Context, queryer core.Queryer) (*schemas.Version, error)
 
+	SQLType(*schemas.Column) string
+	Alias(string) string       // return what a sql type's alias of
+	ColumnTypeKind(string) int // database column type kind
+
 	IsReserved(string) bool
 	Quoter() schemas.Quoter
 	SetQuotePolicy(quotePolicy QuotePolicy)
@@ -80,6 +82,11 @@ type Base struct {
 	quoter  schemas.Quoter
 }
 
+// Alias returned col itself
+func (db *Base) Alias(col string) string {
+	return col
+}
+
 // Quoter returns the current database Quoter
 func (db *Base) Quoter() schemas.Quoter {
 	return db.quoter
@@ -96,11 +103,6 @@ func (db *Base) URI() *URI {
 	return db.uri
 }
 
-// FormatBytes formats bytes
-func (db *Base) FormatBytes(bs []byte) string {
-	return fmt.Sprintf("0x%x", bs)
-}
-
 // DropTableSQL returns drop table SQL
 func (db *Base) DropTableSQL(tableName string) (string, bool) {
 	quote := db.dialect.Quoter().Quote
@@ -118,7 +120,7 @@ func (db *Base) HasRecords(queryer core.Queryer, ctx context.Context, query stri
 	if rows.Next() {
 		return true, nil
 	}
-	return false, nil
+	return false, rows.Err()
 }
 
 // IsColumnExist returns true if the column of the table exist
diff --git a/dialects/driver.go b/dialects/driver.go
index bb46a936..c511b665 100644
--- a/dialects/driver.go
+++ b/dialects/driver.go
@@ -5,12 +5,24 @@
 package dialects
 
 import (
+	"database/sql"
 	"fmt"
+	"time"
+
+	"xorm.io/xorm/core"
 )
 
+// ScanContext represents a context when Scan
+type ScanContext struct {
+	DBLocation   *time.Location
+	UserLocation *time.Location
+}
+
 // Driver represents a database driver
 type Driver interface {
 	Parse(string, string) (*URI, error)
+	GenScanResult(string) (interface{}, error) // according given column type generating a suitable scan interface
+	Scan(*ScanContext, *core.Rows, []*sql.ColumnType, ...interface{}) error
 }
 
 var (
@@ -59,3 +71,9 @@ func OpenDialect(driverName, connstr string) (Dialect, error) {
 
 	return dialect, nil
 }
+
+type baseDriver struct{}
+
+func (b *baseDriver) Scan(ctx *ScanContext, rows *core.Rows, types []*sql.ColumnType, v ...interface{}) error {
+	return rows.Scan(v...)
+}
diff --git a/dialects/mssql.go b/dialects/mssql.go
index 0533288e..9d314523 100644
--- a/dialects/mssql.go
+++ b/dialects/mssql.go
@@ -6,6 +6,7 @@ package dialects
 
 import (
 	"context"
+	"database/sql"
 	"errors"
 	"fmt"
 	"net/url"
@@ -263,6 +264,9 @@ func (db *mssql) Version(ctx context.Context, queryer core.Queryer) (*schemas.Ve
 
 	var version, level, edition string
 	if !rows.Next() {
+		if rows.Err() != nil {
+			return nil, rows.Err()
+		}
 		return nil, errors.New("unknow version")
 	}
 
@@ -363,6 +367,19 @@ func (db *mssql) SQLType(c *schemas.Column) string {
 	return res
 }
 
+func (db *mssql) ColumnTypeKind(t string) int {
+	switch strings.ToUpper(t) {
+	case "DATE", "DATETIME", "DATETIME2", "TIME":
+		return schemas.TIME_TYPE
+	case "VARCHAR", "TEXT", "CHAR", "NVARCHAR", "NCHAR", "NTEXT":
+		return schemas.TEXT_TYPE
+	case "FLOAT", "REAL", "BIGINT", "DATETIMEOFFSET", "TINYINT", "SMALLINT", "INT":
+		return schemas.NUMERIC_TYPE
+	default:
+		return schemas.UNKNOW_TYPE
+	}
+}
+
 func (db *mssql) IsReserved(name string) bool {
 	_, ok := mssqlReservedWords[strings.ToUpper(name)]
 	return ok
@@ -495,6 +512,9 @@ func (db *mssql) GetColumns(queryer core.Queryer, ctx context.Context, tableName
 		cols[col.Name] = col
 		colSeq = append(colSeq, col.Name)
 	}
+	if rows.Err() != nil {
+		return nil, nil, rows.Err()
+	}
 	return colSeq, cols, nil
 }
 
@@ -519,6 +539,9 @@ func (db *mssql) GetTables(queryer core.Queryer, ctx context.Context) ([]*schema
 		table.Name = strings.Trim(name, "` ")
 		tables = append(tables, table)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return tables, nil
 }
 
@@ -542,7 +565,7 @@ WHERE IXS.TYPE_DESC='NONCLUSTERED' and OBJECT_NAME(IXS.OBJECT_ID) =?
 	}
 	defer rows.Close()
 
-	indexes := make(map[string]*schemas.Index, 0)
+	indexes := make(map[string]*schemas.Index)
 	for rows.Next() {
 		var indexType int
 		var indexName, colName, isUnique string
@@ -581,6 +604,9 @@ WHERE IXS.TYPE_DESC='NONCLUSTERED' and OBJECT_NAME(IXS.OBJECT_ID) =?
 		}
 		index.AddColumn(colName)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return indexes, nil
 }
 
@@ -624,6 +650,7 @@ func (db *mssql) Filters() []Filter {
 }
 
 type odbcDriver struct {
+	baseDriver
 }
 
 func (p *odbcDriver) Parse(driverName, dataSourceName string) (*URI, error) {
@@ -640,8 +667,7 @@ func (p *odbcDriver) Parse(driverName, dataSourceName string) (*URI, error) {
 		for _, c := range kv {
 			vv := strings.Split(strings.TrimSpace(c), "=")
 			if len(vv) == 2 {
-				switch strings.ToLower(vv[0]) {
-				case "database":
+				if strings.ToLower(vv[0]) == "database" {
 					dbName = vv[1]
 				}
 			}
@@ -652,3 +678,26 @@ func (p *odbcDriver) Parse(driverName, dataSourceName string) (*URI, error) {
 	}
 	return &URI{DBName: dbName, DBType: schemas.MSSQL}, nil
 }
+
+func (p *odbcDriver) GenScanResult(colType string) (interface{}, error) {
+	switch colType {
+	case "VARCHAR", "TEXT", "CHAR", "NVARCHAR", "NCHAR", "NTEXT":
+		fallthrough
+	case "DATE", "DATETIME", "DATETIME2", "TIME":
+		var s sql.NullString
+		return &s, nil
+	case "FLOAT", "REAL":
+		var s sql.NullFloat64
+		return &s, nil
+	case "BIGINT", "DATETIMEOFFSET":
+		var s sql.NullInt64
+		return &s, nil
+	case "TINYINT", "SMALLINT", "INT":
+		var s sql.NullInt32
+		return &s, nil
+
+	default:
+		var r sql.RawBytes
+		return &r, nil
+	}
+}
diff --git a/dialects/mysql.go b/dialects/mysql.go
index a169b901..71ee3864 100644
--- a/dialects/mysql.go
+++ b/dialects/mysql.go
@@ -7,6 +7,7 @@ package dialects
 import (
 	"context"
 	"crypto/tls"
+	"database/sql"
 	"errors"
 	"fmt"
 	"regexp"
@@ -188,6 +189,21 @@ func (db *mysql) Init(uri *URI) error {
 	return db.Base.Init(db, uri)
 }
 
+var (
+	mysqlColAliases = map[string]string{
+		"numeric": "decimal",
+	}
+)
+
+// Alias returns a alias of column
+func (db *mysql) Alias(col string) string {
+	v, ok := mysqlColAliases[strings.ToLower(col)]
+	if ok {
+		return v
+	}
+	return col
+}
+
 func (db *mysql) Version(ctx context.Context, queryer core.Queryer) (*schemas.Version, error) {
 	rows, err := queryer.QueryContext(ctx, "SELECT @@VERSION")
 	if err != nil {
@@ -197,7 +213,10 @@ func (db *mysql) Version(ctx context.Context, queryer core.Queryer) (*schemas.Ve
 
 	var version string
 	if !rows.Next() {
-		return nil, errors.New("Unknow version")
+		if rows.Err() != nil {
+			return nil, rows.Err()
+		}
+		return nil, errors.New("unknow version")
 	}
 
 	if err := rows.Scan(&version); err != nil {
@@ -238,9 +257,6 @@ func (db *mysql) SetParams(params map[string]string) {
 			fallthrough
 		case "COMPRESSED":
 			db.rowFormat = t
-			break
-		default:
-			break
 		}
 	}
 }
@@ -320,6 +336,21 @@ func (db *mysql) SQLType(c *schemas.Column) string {
 	return res
 }
 
+func (db *mysql) ColumnTypeKind(t string) int {
+	switch strings.ToUpper(t) {
+	case "DATETIME":
+		return schemas.TIME_TYPE
+	case "CHAR", "VARCHAR", "TINYTEXT", "TEXT", "MEDIUMTEXT", "LONGTEXT", "ENUM", "SET":
+		return schemas.TEXT_TYPE
+	case "BIGINT", "TINYINT", "SMALLINT", "MEDIUMINT", "INT", "FLOAT", "REAL", "DOUBLE PRECISION", "DECIMAL", "NUMERIC", "BIT":
+		return schemas.NUMERIC_TYPE
+	case "BINARY", "VARBINARY", "TINYBLOB", "BLOB", "MEDIUMBLOB", "LONGBLOB":
+		return schemas.BLOB_TYPE
+	default:
+		return schemas.UNKNOW_TYPE
+	}
+}
+
 func (db *mysql) IsReserved(name string) bool {
 	_, ok := mysqlReservedWords[strings.ToUpper(name)]
 	return ok
@@ -472,6 +503,9 @@ func (db *mysql) GetColumns(queryer core.Queryer, ctx context.Context, tableName
 		cols[col.Name] = col
 		colSeq = append(colSeq, col.Name)
 	}
+	if rows.Err() != nil {
+		return nil, nil, rows.Err()
+	}
 	return colSeq, cols, nil
 }
 
@@ -503,6 +537,9 @@ func (db *mysql) GetTables(queryer core.Queryer, ctx context.Context) ([]*schema
 		table.StoreEngine = engine
 		tables = append(tables, table)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return tables, nil
 }
 
@@ -533,7 +570,7 @@ func (db *mysql) GetIndexes(queryer core.Queryer, ctx context.Context, tableName
 	}
 	defer rows.Close()
 
-	indexes := make(map[string]*schemas.Index, 0)
+	indexes := make(map[string]*schemas.Index)
 	for rows.Next() {
 		var indexType int
 		var indexName, colName, nonUnique string
@@ -546,7 +583,7 @@ func (db *mysql) GetIndexes(queryer core.Queryer, ctx context.Context, tableName
 			continue
 		}
 
-		if "YES" == nonUnique || nonUnique == "1" {
+		if nonUnique == "YES" || nonUnique == "1" {
 			indexType = schemas.IndexType
 		} else {
 			indexType = schemas.UniqueType
@@ -570,6 +607,9 @@ func (db *mysql) GetIndexes(queryer core.Queryer, ctx context.Context, tableName
 		}
 		index.AddColumn(colName)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return indexes, nil
 }
 
@@ -630,7 +670,77 @@ func (db *mysql) Filters() []Filter {
 	return []Filter{}
 }
 
+type mysqlDriver struct {
+	baseDriver
+}
+
+func (p *mysqlDriver) Parse(driverName, dataSourceName string) (*URI, error) {
+	dsnPattern := regexp.MustCompile(
+		`^(?:(?P<user>.*?)(?::(?P<passwd>.*))?@)?` + // [user[:password]@]
+			`(?:(?P<net>[^\(]*)(?:\((?P<addr>[^\)]*)\))?)?` + // [net[(addr)]]
+			`\/(?P<dbname>.*?)` + // /dbname
+			`(?:\?(?P<params>[^\?]*))?$`) // [?param1=value1&paramN=valueN]
+	matches := dsnPattern.FindStringSubmatch(dataSourceName)
+	// tlsConfigRegister := make(map[string]*tls.Config)
+	names := dsnPattern.SubexpNames()
+
+	uri := &URI{DBType: schemas.MYSQL}
+
+	for i, match := range matches {
+		switch names[i] {
+		case "dbname":
+			uri.DBName = match
+		case "params":
+			if len(match) > 0 {
+				kvs := strings.Split(match, "&")
+				for _, kv := range kvs {
+					splits := strings.Split(kv, "=")
+					if len(splits) == 2 {
+						if splits[0] == "charset" {
+							uri.Charset = splits[1]
+						}
+					}
+				}
+			}
+		}
+	}
+	return uri, nil
+}
+
+func (p *mysqlDriver) GenScanResult(colType string) (interface{}, error) {
+	switch colType {
+	case "CHAR", "VARCHAR", "TINYTEXT", "TEXT", "MEDIUMTEXT", "LONGTEXT", "ENUM", "SET":
+		var s sql.NullString
+		return &s, nil
+	case "BIGINT":
+		var s sql.NullInt64
+		return &s, nil
+	case "TINYINT", "SMALLINT", "MEDIUMINT", "INT":
+		var s sql.NullInt32
+		return &s, nil
+	case "FLOAT", "REAL", "DOUBLE PRECISION", "DOUBLE":
+		var s sql.NullFloat64
+		return &s, nil
+	case "DECIMAL", "NUMERIC":
+		var s sql.NullString
+		return &s, nil
+	case "DATETIME", "TIMESTAMP":
+		var s sql.NullTime
+		return &s, nil
+	case "BIT":
+		var s sql.RawBytes
+		return &s, nil
+	case "BINARY", "VARBINARY", "TINYBLOB", "BLOB", "MEDIUMBLOB", "LONGBLOB":
+		var r sql.RawBytes
+		return &r, nil
+	default:
+		var r sql.RawBytes
+		return &r, nil
+	}
+}
+
 type mymysqlDriver struct {
+	mysqlDriver
 }
 
 func (p *mymysqlDriver) Parse(driverName, dataSourceName string) (*URI, error) {
@@ -681,41 +791,3 @@ func (p *mymysqlDriver) Parse(driverName, dataSourceName string) (*URI, error) {
 
 	return uri, nil
 }
-
-type mysqlDriver struct {
-}
-
-func (p *mysqlDriver) Parse(driverName, dataSourceName string) (*URI, error) {
-	dsnPattern := regexp.MustCompile(
-		`^(?:(?P<user>.*?)(?::(?P<passwd>.*))?@)?` + // [user[:password]@]
-			`(?:(?P<net>[^\(]*)(?:\((?P<addr>[^\)]*)\))?)?` + // [net[(addr)]]
-			`\/(?P<dbname>.*?)` + // /dbname
-			`(?:\?(?P<params>[^\?]*))?$`) // [?param1=value1&paramN=valueN]
-	matches := dsnPattern.FindStringSubmatch(dataSourceName)
-	// tlsConfigRegister := make(map[string]*tls.Config)
-	names := dsnPattern.SubexpNames()
-
-	uri := &URI{DBType: schemas.MYSQL}
-
-	for i, match := range matches {
-		switch names[i] {
-		case "dbname":
-			uri.DBName = match
-		case "params":
-			if len(match) > 0 {
-				kvs := strings.Split(match, "&")
-				for _, kv := range kvs {
-					splits := strings.Split(kv, "=")
-					if len(splits) == 2 {
-						switch splits[0] {
-						case "charset":
-							uri.Charset = splits[1]
-						}
-					}
-				}
-			}
-
-		}
-	}
-	return uri, nil
-}
diff --git a/dialects/oracle.go b/dialects/oracle.go
index 0b06c4c6..902e0c66 100644
--- a/dialects/oracle.go
+++ b/dialects/oracle.go
@@ -6,6 +6,7 @@ package dialects
 
 import (
 	"context"
+	"database/sql"
 	"errors"
 	"fmt"
 	"regexp"
@@ -524,6 +525,9 @@ func (db *oracle) Version(ctx context.Context, queryer core.Queryer) (*schemas.V
 
 	var version string
 	if !rows.Next() {
+		if rows.Err() != nil {
+			return nil, rows.Err()
+		}
 		return nil, errors.New("unknow version")
 	}
 
@@ -567,6 +571,21 @@ func (db *oracle) SQLType(c *schemas.Column) string {
 	return res
 }
 
+func (db *oracle) ColumnTypeKind(t string) int {
+	switch strings.ToUpper(t) {
+	case "DATE":
+		return schemas.TIME_TYPE
+	case "CHAR", "NCHAR", "VARCHAR", "VARCHAR2", "NVARCHAR2", "LONG", "CLOB", "NCLOB":
+		return schemas.TEXT_TYPE
+	case "NUMBER":
+		return schemas.NUMERIC_TYPE
+	case "BLOB":
+		return schemas.BLOB_TYPE
+	default:
+		return schemas.UNKNOW_TYPE
+	}
+}
+
 func (db *oracle) AutoIncrStr() string {
 	return "AUTO_INCREMENT"
 }
@@ -740,6 +759,9 @@ func (db *oracle) GetColumns(queryer core.Queryer, ctx context.Context, tableNam
 		cols[col.Name] = col
 		colSeq = append(colSeq, col.Name)
 	}
+	if rows.Err() != nil {
+		return nil, nil, rows.Err()
+	}
 
 	return colSeq, cols, nil
 }
@@ -764,6 +786,9 @@ func (db *oracle) GetTables(queryer core.Queryer, ctx context.Context) ([]*schem
 
 		tables = append(tables, table)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return tables, nil
 }
 
@@ -778,7 +803,7 @@ func (db *oracle) GetIndexes(queryer core.Queryer, ctx context.Context, tableNam
 	}
 	defer rows.Close()
 
-	indexes := make(map[string]*schemas.Index, 0)
+	indexes := make(map[string]*schemas.Index)
 	for rows.Next() {
 		var indexType int
 		var indexName, colName, uniqueness string
@@ -813,6 +838,9 @@ func (db *oracle) GetIndexes(queryer core.Queryer, ctx context.Context, tableNam
 		}
 		index.AddColumn(colName)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return indexes, nil
 }
 
@@ -823,9 +851,10 @@ func (db *oracle) Filters() []Filter {
 }
 
 type godrorDriver struct {
+	baseDriver
 }
 
-func (cfg *godrorDriver) Parse(driverName, dataSourceName string) (*URI, error) {
+func (g *godrorDriver) Parse(driverName, dataSourceName string) (*URI, error) {
 	db := &URI{DBType: schemas.ORACLE}
 	dsnPattern := regexp.MustCompile(
 		`^(?:(?P<user>.*?)(?::(?P<passwd>.*))?@)?` + // [user[:password]@]
@@ -837,8 +866,7 @@ func (cfg *godrorDriver) Parse(driverName, dataSourceName string) (*URI, error)
 	names := dsnPattern.SubexpNames()
 
 	for i, match := range matches {
-		switch names[i] {
-		case "dbname":
+		if names[i] == "dbname" {
 			db.DBName = match
 		}
 	}
@@ -848,12 +876,33 @@ func (cfg *godrorDriver) Parse(driverName, dataSourceName string) (*URI, error)
 	return db, nil
 }
 
+func (g *godrorDriver) GenScanResult(colType string) (interface{}, error) {
+	switch colType {
+	case "CHAR", "NCHAR", "VARCHAR", "VARCHAR2", "NVARCHAR2", "LONG", "CLOB", "NCLOB":
+		var s sql.NullString
+		return &s, nil
+	case "NUMBER":
+		var s sql.NullString
+		return &s, nil
+	case "DATE":
+		var s sql.NullTime
+		return &s, nil
+	case "BLOB":
+		var r sql.RawBytes
+		return &r, nil
+	default:
+		var r sql.RawBytes
+		return &r, nil
+	}
+}
+
 type oci8Driver struct {
+	godrorDriver
 }
 
 // dataSourceName=user/password@ipv4:port/dbname
 // dataSourceName=user/password@[ipv6]:port/dbname
-func (p *oci8Driver) Parse(driverName, dataSourceName string) (*URI, error) {
+func (o *oci8Driver) Parse(driverName, dataSourceName string) (*URI, error) {
 	db := &URI{DBType: schemas.ORACLE}
 	dsnPattern := regexp.MustCompile(
 		`^(?P<user>.*)\/(?P<password>.*)@` + // user:password@
@@ -862,8 +911,7 @@ func (p *oci8Driver) Parse(driverName, dataSourceName string) (*URI, error) {
 	matches := dsnPattern.FindStringSubmatch(dataSourceName)
 	names := dsnPattern.SubexpNames()
 	for i, match := range matches {
-		switch names[i] {
-		case "dbname":
+		if names[i] == "dbname" {
 			db.DBName = match
 		}
 	}
diff --git a/dialects/postgres.go b/dialects/postgres.go
index 9acf763a..6462982d 100644
--- a/dialects/postgres.go
+++ b/dialects/postgres.go
@@ -6,6 +6,7 @@ package dialects
 
 import (
 	"context"
+	"database/sql"
 	"errors"
 	"fmt"
 	"net/url"
@@ -777,12 +778,24 @@ var (
 var (
 	// DefaultPostgresSchema default postgres schema
 	DefaultPostgresSchema = "public"
+	postgresColAliases    = map[string]string{
+		"numeric": "decimal",
+	}
 )
 
 type postgres struct {
 	Base
 }
 
+// Alias returns a alias of column
+func (db *postgres) Alias(col string) string {
+	v, ok := postgresColAliases[strings.ToLower(col)]
+	if ok {
+		return v
+	}
+	return col
+}
+
 func (db *postgres) Init(uri *URI) error {
 	db.quoter = postgresQuoter
 	return db.Base.Init(db, uri)
@@ -797,7 +810,10 @@ func (db *postgres) Version(ctx context.Context, queryer core.Queryer) (*schemas
 
 	var version string
 	if !rows.Next() {
-		return nil, errors.New("Unknow version")
+		if rows.Err() != nil {
+			return nil, rows.Err()
+		}
+		return nil, errors.New("unknow version")
 	}
 
 	if err := rows.Scan(&version); err != nil {
@@ -860,11 +876,6 @@ func (db *postgres) SetQuotePolicy(quotePolicy QuotePolicy) {
 	}
 }
 
-// FormatBytes formats bytes
-func (db *postgres) FormatBytes(bs []byte) string {
-	return fmt.Sprintf("E'\\x%x'", bs)
-}
-
 func (db *postgres) SQLType(c *schemas.Column) string {
 	var res string
 	switch t := c.SQLType.Name; t {
@@ -930,6 +941,21 @@ func (db *postgres) SQLType(c *schemas.Column) string {
 	return res
 }
 
+func (db *postgres) ColumnTypeKind(t string) int {
+	switch strings.ToUpper(t) {
+	case "DATETIME", "TIMESTAMP":
+		return schemas.TIME_TYPE
+	case "VARCHAR", "TEXT":
+		return schemas.TEXT_TYPE
+	case "BIGINT", "BIGSERIAL", "SMALLINT", "INT", "INT8", "INT4", "INTEGER", "SERIAL", "FLOAT", "FLOAT4", "REAL", "DOUBLE PRECISION":
+		return schemas.NUMERIC_TYPE
+	case "BOOL":
+		return schemas.BOOL_TYPE
+	default:
+		return schemas.UNKNOW_TYPE
+	}
+}
+
 func (db *postgres) IsReserved(name string) bool {
 	_, ok := postgresReservedWords[strings.ToUpper(name)]
 	return ok
@@ -1039,7 +1065,10 @@ func (db *postgres) IsColumnExist(queryer core.Queryer, ctx context.Context, tab
 	}
 	defer rows.Close()
 
-	return rows.Next(), nil
+	if rows.Next() {
+		return true, nil
+	}
+	return false, rows.Err()
 }
 
 func (db *postgres) GetColumns(queryer core.Queryer, ctx context.Context, tableName string) ([]string, map[string]*schemas.Column, error) {
@@ -1169,7 +1198,7 @@ WHERE n.nspname= s.table_schema AND c.relkind = 'r'::char AND c.relname = $1%s A
 			}
 		}
 		if _, ok := schemas.SqlTypes[col.SQLType.Name]; !ok {
-			return nil, nil, fmt.Errorf("Unknown colType: %s - %s", dataType, col.SQLType.Name)
+			return nil, nil, fmt.Errorf("unknown colType: %s - %s", dataType, col.SQLType.Name)
 		}
 
 		col.Length = maxLen
@@ -1177,19 +1206,22 @@ WHERE n.nspname= s.table_schema AND c.relkind = 'r'::char AND c.relname = $1%s A
 		if !col.DefaultIsEmpty {
 			if col.SQLType.IsText() {
 				if strings.HasSuffix(col.Default, "::character varying") {
-					col.Default = strings.TrimRight(col.Default, "::character varying")
+					col.Default = strings.TrimSuffix(col.Default, "::character varying")
 				} else if !strings.HasPrefix(col.Default, "'") {
 					col.Default = "'" + col.Default + "'"
 				}
 			} else if col.SQLType.IsTime() {
 				if strings.HasSuffix(col.Default, "::timestamp without time zone") {
-					col.Default = strings.TrimRight(col.Default, "::timestamp without time zone")
+					col.Default = strings.TrimSuffix(col.Default, "::timestamp without time zone")
 				}
 			}
 		}
 		cols[col.Name] = col
 		colSeq = append(colSeq, col.Name)
 	}
+	if rows.Err() != nil {
+		return nil, nil, rows.Err()
+	}
 
 	return colSeq, cols, nil
 }
@@ -1220,6 +1252,9 @@ func (db *postgres) GetTables(queryer core.Queryer, ctx context.Context) ([]*sch
 		table.Name = name
 		tables = append(tables, table)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return tables, nil
 }
 
@@ -1236,7 +1271,7 @@ func getIndexColName(indexdef string) []string {
 
 func (db *postgres) GetIndexes(queryer core.Queryer, ctx context.Context, tableName string) (map[string]*schemas.Index, error) {
 	args := []interface{}{tableName}
-	s := fmt.Sprintf("SELECT indexname, indexdef FROM pg_indexes WHERE tablename=$1")
+	s := "SELECT indexname, indexdef FROM pg_indexes WHERE tablename=$1"
 	if len(db.getSchema()) != 0 {
 		args = append(args, db.getSchema())
 		s = s + " AND schemaname=$2"
@@ -1248,7 +1283,7 @@ func (db *postgres) GetIndexes(queryer core.Queryer, ctx context.Context, tableN
 	}
 	defer rows.Close()
 
-	indexes := make(map[string]*schemas.Index, 0)
+	indexes := make(map[string]*schemas.Index)
 	for rows.Next() {
 		var indexType int
 		var indexName, indexdef string
@@ -1290,6 +1325,9 @@ func (db *postgres) GetIndexes(queryer core.Queryer, ctx context.Context, tableN
 		index.IsRegular = isRegular
 		indexes[index.Name] = index
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return indexes, nil
 }
 
@@ -1298,6 +1336,7 @@ func (db *postgres) Filters() []Filter {
 }
 
 type pqDriver struct {
+	baseDriver
 }
 
 type values map[string]string
@@ -1374,6 +1413,32 @@ func (p *pqDriver) Parse(driverName, dataSourceName string) (*URI, error) {
 	return db, nil
 }
 
+func (p *pqDriver) GenScanResult(colType string) (interface{}, error) {
+	switch colType {
+	case "VARCHAR", "TEXT":
+		var s sql.NullString
+		return &s, nil
+	case "BIGINT", "BIGSERIAL":
+		var s sql.NullInt64
+		return &s, nil
+	case "SMALLINT", "INT", "INT8", "INT4", "INTEGER", "SERIAL":
+		var s sql.NullInt32
+		return &s, nil
+	case "FLOAT", "FLOAT4", "REAL", "DOUBLE PRECISION":
+		var s sql.NullFloat64
+		return &s, nil
+	case "DATETIME", "TIMESTAMP":
+		var s sql.NullTime
+		return &s, nil
+	case "BOOL":
+		var s sql.NullBool
+		return &s, nil
+	default:
+		var r sql.RawBytes
+		return &r, nil
+	}
+}
+
 type pqDriverPgx struct {
 	pqDriver
 }
@@ -1401,6 +1466,9 @@ func QueryDefaultPostgresSchema(ctx context.Context, queryer core.Queryer) (stri
 		parts := strings.Split(defaultSchema, ",")
 		return strings.TrimSpace(parts[len(parts)-1]), nil
 	}
+	if rows.Err() != nil {
+		return "", rows.Err()
+	}
 
-	return "", errors.New("No default schema")
+	return "", errors.New("no default schema")
 }
diff --git a/dialects/postgres_test.go b/dialects/postgres_test.go
index c0a8eb6f..e0c36f92 100644
--- a/dialects/postgres_test.go
+++ b/dialects/postgres_test.go
@@ -76,9 +76,7 @@ func TestParsePgx(t *testing.T) {
 		} else if err == nil && !reflect.DeepEqual(test.expected, uri.DBName) {
 			t.Errorf("%q got: %#v want: %#v", test.in, uri.DBName, test.expected)
 		}
-
 	}
-
 }
 
 func TestGetIndexColName(t *testing.T) {
diff --git a/dialects/sqlite3.go b/dialects/sqlite3.go
index a42aad48..89f86147 100644
--- a/dialects/sqlite3.go
+++ b/dialects/sqlite3.go
@@ -169,7 +169,10 @@ func (db *sqlite3) Version(ctx context.Context, queryer core.Queryer) (*schemas.
 
 	var version string
 	if !rows.Next() {
-		return nil, errors.New("Unknow version")
+		if rows.Err() != nil {
+			return nil, rows.Err()
+		}
+		return nil, errors.New("unknow version")
 	}
 
 	if err := rows.Scan(&version); err != nil {
@@ -233,8 +236,19 @@ func (db *sqlite3) SQLType(c *schemas.Column) string {
 	}
 }
 
-func (db *sqlite3) FormatBytes(bs []byte) string {
-	return fmt.Sprintf("X'%x'", bs)
+func (db *sqlite3) ColumnTypeKind(t string) int {
+	switch strings.ToUpper(t) {
+	case "DATETIME":
+		return schemas.TIME_TYPE
+	case "TEXT":
+		return schemas.TEXT_TYPE
+	case "INTEGER", "REAL", "NUMERIC", "DECIMAL":
+		return schemas.NUMERIC_TYPE
+	case "BLOB":
+		return schemas.BLOB_TYPE
+	default:
+		return schemas.UNKNOW_TYPE
+	}
 }
 
 func (db *sqlite3) IsReserved(name string) bool {
@@ -404,12 +418,14 @@ func (db *sqlite3) GetColumns(queryer core.Queryer, ctx context.Context, tableNa
 	defer rows.Close()
 
 	var name string
-	for rows.Next() {
+	if rows.Next() {
 		err = rows.Scan(&name)
 		if err != nil {
 			return nil, nil, err
 		}
-		break
+	}
+	if rows.Err() != nil {
+		return nil, nil, rows.Err()
 	}
 
 	if name == "" {
@@ -472,6 +488,9 @@ func (db *sqlite3) GetTables(queryer core.Queryer, ctx context.Context) ([]*sche
 		}
 		tables = append(tables, table)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 	return tables, nil
 }
 
@@ -485,7 +504,7 @@ func (db *sqlite3) GetIndexes(queryer core.Queryer, ctx context.Context, tableNa
 	}
 	defer rows.Close()
 
-	indexes := make(map[string]*schemas.Index, 0)
+	indexes := make(map[string]*schemas.Index)
 	for rows.Next() {
 		var tmpSQL sql.NullString
 		err = rows.Scan(&tmpSQL)
@@ -531,6 +550,9 @@ func (db *sqlite3) GetIndexes(queryer core.Queryer, ctx context.Context, tableNa
 		index.IsRegular = isRegular
 		indexes[index.Name] = index
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 
 	return indexes, nil
 }
@@ -540,6 +562,7 @@ func (db *sqlite3) Filters() []Filter {
 }
 
 type sqlite3Driver struct {
+	baseDriver
 }
 
 func (p *sqlite3Driver) Parse(driverName, dataSourceName string) (*URI, error) {
@@ -549,3 +572,29 @@ func (p *sqlite3Driver) Parse(driverName, dataSourceName string) (*URI, error) {
 
 	return &URI{DBType: schemas.SQLITE, DBName: dataSourceName}, nil
 }
+
+func (p *sqlite3Driver) GenScanResult(colType string) (interface{}, error) {
+	switch colType {
+	case "TEXT":
+		var s sql.NullString
+		return &s, nil
+	case "INTEGER":
+		var s sql.NullInt64
+		return &s, nil
+	case "DATETIME":
+		var s sql.NullTime
+		return &s, nil
+	case "REAL":
+		var s sql.NullFloat64
+		return &s, nil
+	case "NUMERIC", "DECIMAL":
+		var s sql.NullString
+		return &s, nil
+	case "BLOB":
+		var s sql.RawBytes
+		return &s, nil
+	default:
+		var r sql.NullString
+		return &r, nil
+	}
+}
diff --git a/engine.go b/engine.go
index 76ce8f1a..20c07e13 100644
--- a/engine.go
+++ b/engine.go
@@ -13,7 +13,6 @@ import (
 	"os"
 	"reflect"
 	"runtime"
-	"strconv"
 	"strings"
 	"time"
 
@@ -21,7 +20,6 @@ import (
 	"xorm.io/xorm/contexts"
 	"xorm.io/xorm/core"
 	"xorm.io/xorm/dialects"
-	"xorm.io/xorm/internal/json"
 	"xorm.io/xorm/internal/utils"
 	"xorm.io/xorm/log"
 	"xorm.io/xorm/names"
@@ -35,6 +33,7 @@ type Engine struct {
 	cacherMgr      *caches.Manager
 	defaultContext context.Context
 	dialect        dialects.Dialect
+	driver         dialects.Driver
 	engineGroup    *EngineGroup
 	logger         log.ContextLogger
 	tagParser      *tags.Parser
@@ -72,6 +71,7 @@ func newEngine(driverName, dataSourceName string, dialect dialects.Dialect, db *
 
 	engine := &Engine{
 		dialect:        dialect,
+		driver:         dialects.QueryDriver(driverName),
 		TZLocation:     time.Local,
 		defaultContext: context.Background(),
 		cacherMgr:      cacherMgr,
@@ -444,95 +444,14 @@ func (engine *Engine) DumpTables(tables []*schemas.Table, w io.Writer, tp ...sch
 	return engine.dumpTables(tables, w, tp...)
 }
 
-func formatColumnValue(dstDialect dialects.Dialect, d interface{}, col *schemas.Column) string {
-	if d == nil {
-		return "NULL"
-	}
-
-	if dq, ok := d.(bool); ok && (dstDialect.URI().DBType == schemas.SQLITE ||
-		dstDialect.URI().DBType == schemas.MSSQL) {
-		if dq {
+func formatBool(s string, dstDialect dialects.Dialect) string {
+	if dstDialect.URI().DBType == schemas.MSSQL {
+		switch s {
+		case "true":
 			return "1"
+		case "false":
+			return "0"
 		}
-		return "0"
-	}
-
-	if col.SQLType.IsText() {
-		var v string
-		switch reflect.TypeOf(d).Kind() {
-		case reflect.Struct, reflect.Array, reflect.Slice, reflect.Map:
-			bytes, err := json.DefaultJSONHandler.Marshal(d)
-			if err != nil {
-				v = fmt.Sprintf("%s", d)
-			} else {
-				v = string(bytes)
-			}
-		default:
-			v = fmt.Sprintf("%s", d)
-		}
-
-		return "'" + strings.Replace(v, "'", "''", -1) + "'"
-	} else if col.SQLType.IsTime() {
-		if dstDialect.URI().DBType == schemas.MSSQL && col.SQLType.Name == schemas.DateTime {
-			if t, ok := d.(time.Time); ok {
-				return "'" + t.UTC().Format("2006-01-02 15:04:05") + "'"
-			}
-		}
-		var v = fmt.Sprintf("%s", d)
-		if strings.HasSuffix(v, " +0000 UTC") {
-			return fmt.Sprintf("'%s'", v[0:len(v)-len(" +0000 UTC")])
-		} else if strings.HasSuffix(v, " +0000 +0000") {
-			return fmt.Sprintf("'%s'", v[0:len(v)-len(" +0000 +0000")])
-		}
-		return "'" + strings.Replace(v, "'", "''", -1) + "'"
-	} else if col.SQLType.IsBlob() {
-		if reflect.TypeOf(d).Kind() == reflect.Slice {
-			return fmt.Sprintf("%s", dstDialect.FormatBytes(d.([]byte)))
-		} else if reflect.TypeOf(d).Kind() == reflect.String {
-			return fmt.Sprintf("'%s'", d.(string))
-		}
-	} else if col.SQLType.IsNumeric() {
-		switch reflect.TypeOf(d).Kind() {
-		case reflect.Slice:
-			if col.SQLType.Name == schemas.Bool {
-				return fmt.Sprintf("%v", strconv.FormatBool(d.([]byte)[0] != byte('0')))
-			}
-			return fmt.Sprintf("%s", string(d.([]byte)))
-		case reflect.Int16, reflect.Int8, reflect.Int32, reflect.Int64, reflect.Int:
-			if col.SQLType.Name == schemas.Bool {
-				v := reflect.ValueOf(d).Int() > 0
-				if dstDialect.URI().DBType == schemas.SQLITE {
-					if v {
-						return "1"
-					}
-					return "0"
-				}
-				return fmt.Sprintf("%v", strconv.FormatBool(v))
-			}
-			return fmt.Sprintf("%d", d)
-		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
-			if col.SQLType.Name == schemas.Bool {
-				v := reflect.ValueOf(d).Uint() > 0
-				if dstDialect.URI().DBType == schemas.SQLITE {
-					if v {
-						return "1"
-					}
-					return "0"
-				}
-				return fmt.Sprintf("%v", strconv.FormatBool(v))
-			}
-			return fmt.Sprintf("%d", d)
-		default:
-			return fmt.Sprintf("%v", d)
-		}
-	}
-
-	s := fmt.Sprintf("%v", d)
-	if strings.Contains(s, ":") || strings.Contains(s, "-") {
-		if strings.HasSuffix(s, " +0000 UTC") {
-			return fmt.Sprintf("'%s'", s[0:len(s)-len(" +0000 UTC")])
-		}
-		return fmt.Sprintf("'%s'", s)
 	}
 	return s
 }
@@ -545,7 +464,7 @@ func (engine *Engine) dumpTables(tables []*schemas.Table, w io.Writer, tp ...sch
 	} else {
 		dstDialect = dialects.QueryDialect(tp[0])
 		if dstDialect == nil {
-			return errors.New("Unsupported database type")
+			return fmt.Errorf("unsupported database type %v", tp[0])
 		}
 
 		uri := engine.dialect.URI()
@@ -619,75 +538,78 @@ func (engine *Engine) dumpTables(tables []*schemas.Table, w io.Writer, tp ...sch
 		}
 		defer rows.Close()
 
-		if table.Type != nil {
-			sess := engine.NewSession()
-			defer sess.Close()
-			for rows.Next() {
-				beanValue := reflect.New(table.Type)
-				bean := beanValue.Interface()
-				fields, err := rows.Columns()
-				if err != nil {
-					return err
-				}
-				scanResults, err := sess.row2Slice(rows, fields, bean)
-				if err != nil {
-					return err
-				}
+		types, err := rows.ColumnTypes()
+		if err != nil {
+			return err
+		}
 
-				dataStruct := utils.ReflectValue(bean)
-				_, err = sess.slice2Bean(scanResults, fields, bean, &dataStruct, table)
-				if err != nil {
-					return err
-				}
+		fields, err := rows.Columns()
+		if err != nil {
+			return err
+		}
 
-				_, err = io.WriteString(w, "INSERT INTO "+dstDialect.Quoter().Quote(dstTableName)+" ("+destColNames+") VALUES (")
-				if err != nil {
-					return err
-				}
+		sess := engine.NewSession()
+		defer sess.Close()
+		for rows.Next() {
+			_, err = io.WriteString(w, "INSERT INTO "+dstDialect.Quoter().Quote(dstTableName)+" ("+destColNames+") VALUES (")
+			if err != nil {
+				return err
+			}
 
-				var temp string
-				for _, d := range dstCols {
-					col := table.GetColumn(d)
-					if col == nil {
-						return errors.New("unknown column error")
+			scanResults, err := sess.engine.scanStringInterface(rows, fields, types)
+			if err != nil {
+				return err
+			}
+			for i, scanResult := range scanResults {
+				stp := schemas.SQLType{Name: types[i].DatabaseTypeName()}
+				if stp.IsNumeric() {
+					s := scanResult.(*sql.NullString)
+					if s.Valid {
+						if _, err = io.WriteString(w, formatBool(s.String, dstDialect)); err != nil {
+							return err
+						}
+					} else {
+						if _, err = io.WriteString(w, "NULL"); err != nil {
+							return err
+						}
+					}
+				} else if stp.IsBool() {
+					s := scanResult.(*sql.NullString)
+					if s.Valid {
+						if _, err = io.WriteString(w, formatBool(s.String, dstDialect)); err != nil {
+							return err
+						}
+					} else {
+						if _, err = io.WriteString(w, "NULL"); err != nil {
+							return err
+						}
+					}
+				} else {
+					s := scanResult.(*sql.NullString)
+					if s.Valid {
+						if _, err = io.WriteString(w, "'"+strings.ReplaceAll(s.String, "'", "''")+"'"); err != nil {
+							return err
+						}
+					} else {
+						if _, err = io.WriteString(w, "NULL"); err != nil {
+							return err
+						}
 					}
-
-					field := dataStruct.FieldByIndex(col.FieldIndex)
-					temp += "," + formatColumnValue(dstDialect, field.Interface(), col)
 				}
-				_, err = io.WriteString(w, temp[1:]+");\n")
-				if err != nil {
-					return err
+				if i < len(scanResults)-1 {
+					if _, err = io.WriteString(w, ","); err != nil {
+						return err
+					}
 				}
 			}
-		} else {
-			for rows.Next() {
-				dest := make([]interface{}, len(cols))
-				err = rows.ScanSlice(&dest)
-				if err != nil {
-					return err
-				}
-
-				_, err = io.WriteString(w, "INSERT INTO "+dstDialect.Quoter().Quote(dstTableName)+" ("+destColNames+") VALUES (")
-				if err != nil {
-					return err
-				}
-
-				var temp string
-				for i, d := range dest {
-					col := table.GetColumn(cols[i])
-					if col == nil {
-						return errors.New("unknow column error")
-					}
-
-					temp += "," + formatColumnValue(dstDialect, d, col)
-				}
-				_, err = io.WriteString(w, temp[1:]+");\n")
-				if err != nil {
-					return err
-				}
+			_, err = io.WriteString(w, ");\n")
+			if err != nil {
+				return err
 			}
 		}
+		if rows.Err() != nil {
+			return rows.Err()
+		}
 
 		// FIXME: Hack for postgres
 		if dstDialect.URI().DBType == schemas.POSTGRES && table.AutoIncrColumn() != nil {
@@ -1202,10 +1124,10 @@ func (engine *Engine) Update(bean interface{}, condiBeans ...interface{}) (int64
 }
 
 // Delete records, bean's non-empty fields are conditions
-func (engine *Engine) Delete(bean interface{}) (int64, error) {
+func (engine *Engine) Delete(beans ...interface{}) (int64, error) {
 	session := engine.NewSession()
 	defer session.Close()
-	return session.Delete(bean)
+	return session.Delete(beans...)
 }
 
 // Get retrieve one record from table, bean's non-empty fields
diff --git a/go.mod b/go.mod
index f6e4af90..1b3baf0c 100644
--- a/go.mod
+++ b/go.mod
@@ -3,14 +3,17 @@ module xorm.io/xorm
 go 1.13
 
 require (
-	github.com/denisenkom/go-mssqldb v0.9.0
-	github.com/go-sql-driver/mysql v1.5.0
+	github.com/denisenkom/go-mssqldb v0.10.0
+	github.com/go-sql-driver/mysql v1.6.0
+	github.com/goccy/go-json v0.7.4
 	github.com/json-iterator/go v1.1.11
-	github.com/lib/pq v1.7.0
-	github.com/mattn/go-sqlite3 v1.14.6
-	github.com/stretchr/testify v1.4.0
+	github.com/lib/pq v1.10.2
+	github.com/mattn/go-sqlite3 v1.14.8
+	github.com/shopspring/decimal v1.2.0
+	github.com/stretchr/testify v1.7.0
 	github.com/syndtr/goleveldb v1.0.0
 	github.com/ziutek/mymysql v1.5.4
-	modernc.org/sqlite v1.10.1-0.20210314190707-798bbeb9bb84
-	xorm.io/builder v0.3.8
+	gopkg.in/yaml.v2 v2.2.2 // indirect
+	modernc.org/sqlite v1.11.2
+	xorm.io/builder v0.3.9
 )
diff --git a/go.sum b/go.sum
index 3c79850c..3d4b72a6 100644
--- a/go.sum
+++ b/go.sum
@@ -5,12 +5,18 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/denisenkom/go-mssqldb v0.9.0 h1:RSohk2RsiZqLZ0zCjtfn3S4Gp4exhpBWHyQ7D0yGjAk=
 github.com/denisenkom/go-mssqldb v0.9.0/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU=
+github.com/denisenkom/go-mssqldb v0.10.0 h1:QykgLZBorFE95+gO3u9esLd0BmbvpWp0/waNNZfHBM8=
+github.com/denisenkom/go-mssqldb v0.10.0/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU=
 github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/go-sql-driver/mysql v1.5.0 h1:ozyZYNQW3x3HtqT1jira07DN2PArx2v7/mN66gGcHOs=
 github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfCHuOE=
+github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/goccy/go-json v0.7.4 h1:B44qRUFwz/vxPKPISQ1KhvzRi9kZ28RAf6YtjriBZ5k=
+github.com/goccy/go-json v0.7.4/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe h1:lXe2qZdvpiX5WZkZR4hgp4KJVfY3nMkvmwbVkpv1rVY=
 github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0=
 github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
@@ -28,10 +34,14 @@ github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNU
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
 github.com/lib/pq v1.7.0 h1:h93mCPfUSkaul3Ka/VG8uZdmW1uMHDGxzu0NWHuJmHY=
 github.com/lib/pq v1.7.0/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
+github.com/lib/pq v1.10.2 h1:AqzbZs4ZoCBp+GtejcpCpcxM3zlSMx29dXbUSeVtJb8=
+github.com/lib/pq v1.10.2/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
 github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
+github.com/mattn/go-sqlite3 v1.14.8 h1:gDp86IdQsN/xWjIEmr9MF6o9mpksUgh0fu+9ByFxzIU=
+github.com/mattn/go-sqlite3 v1.14.8/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 h1:ZqeYNhU3OHLH3mGKHDcjJRFFRrJa6eAM5H+CtDdOsPc=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 h1:Esafd1046DLDQ0W1YjYsBW+p8U2u7vzgW2SQVmlNazg=
@@ -45,10 +55,15 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 h1:OdAsTTz6OkFY5QxjkYwrChwuRruF69c169dPK26NUlk=
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/shopspring/decimal v1.2.0 h1:abSATXmQEYyShuxI4/vyW3tV1MrKAJzCZ/0zLUXYbsQ=
+github.com/shopspring/decimal v1.2.0/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/syndtr/goleveldb v1.0.0 h1:fBdIW9lB4Iz0n9khmH8w27SJ3QEJ7+IgjPEwGSZiFdE=
 github.com/syndtr/goleveldb v1.0.0/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpPAyBWyWuQ=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
@@ -99,28 +114,46 @@ gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWD
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+lukechampine.com/uint128 v1.1.1 h1:pnxCASz787iMf+02ssImqk6OLt+Z5QHMoZyUXR4z6JU=
+lukechampine.com/uint128 v1.1.1/go.mod h1:c4eWIwlEGaxC/+H1VguhU4PHXNWDCDMUlWdIWl2j1gk=
 modernc.org/cc/v3 v3.31.5-0.20210308123301-7a3e9dab9009 h1:u0oCo5b9wyLr++HF3AN9JicGhkUxJhMz51+8TIZH9N0=
 modernc.org/cc/v3 v3.31.5-0.20210308123301-7a3e9dab9009/go.mod h1:0R6jl1aZlIl2avnYfbfHBS1QB6/f+16mihBObaBC878=
+modernc.org/cc/v3 v3.33.6 h1:r63dgSzVzRxUpAJFPQWHy1QeZeY1ydNENUDaBx1GqYc=
+modernc.org/cc/v3 v3.33.6/go.mod h1:iPJg1pkwXqAV16SNgFBVYmggfMg6xhs+2oiO0vclK3g=
 modernc.org/ccgo/v3 v3.9.0 h1:JbcEIqjw4Agf+0g3Tc85YvfYqkkFOv6xBwS4zkfqSoA=
 modernc.org/ccgo/v3 v3.9.0/go.mod h1:nQbgkn8mwzPdp4mm6BT6+p85ugQ7FrGgIcYaE7nSrpY=
+modernc.org/ccgo/v3 v3.9.5 h1:dEuUSf8WN51rDkprFuAqjfchKEzN0WttP/Py3enBwjk=
+modernc.org/ccgo/v3 v3.9.5/go.mod h1:umuo2EP2oDSBnD3ckjaVUXMrmeAw8C8OSICVa0iFf60=
 modernc.org/httpfs v1.0.6 h1:AAgIpFZRXuYnkjftxTAZwMIiwEqAfk8aVB2/oA6nAeM=
 modernc.org/httpfs v1.0.6/go.mod h1:7dosgurJGp0sPaRanU53W4xZYKh14wfzX420oZADeHM=
 modernc.org/libc v1.7.13-0.20210308123627-12f642a52bb8/go.mod h1:U1eq8YWr/Kc1RWCMFUWEdkTg8OTcfLw2kY8EDwl039w=
 modernc.org/libc v1.8.0 h1:Pp4uv9g0csgBMpGPABKtkieF6O5MGhfGo6ZiOdlYfR8=
 modernc.org/libc v1.8.0/go.mod h1:U1eq8YWr/Kc1RWCMFUWEdkTg8OTcfLw2kY8EDwl039w=
+modernc.org/libc v1.9.8/go.mod h1:U1eq8YWr/Kc1RWCMFUWEdkTg8OTcfLw2kY8EDwl039w=
+modernc.org/libc v1.9.11 h1:QUxZMs48Ahg2F7SN41aERvMfGLY2HU/ADnB9DC4Yts8=
+modernc.org/libc v1.9.11/go.mod h1:NyF3tsA5ArIjJ83XB0JlqhjTabTCHm9aX4XMPHyQn0Q=
 modernc.org/mathutil v1.1.1/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
 modernc.org/mathutil v1.2.2 h1:+yFk8hBprV+4c0U9GjFtL+dV3N8hOJ8JCituQcMShFY=
 modernc.org/mathutil v1.2.2/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
+modernc.org/mathutil v1.4.0 h1:GCjoRaBew8ECCKINQA2nYjzvufFW9YiEuuB+rQ9bn2E=
+modernc.org/mathutil v1.4.0/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
 modernc.org/memory v1.0.4 h1:utMBrFcpnQDdNsmM6asmyH/FM9TqLPS7XF7otpJmrwM=
 modernc.org/memory v1.0.4/go.mod h1:nV2OApxradM3/OVbs2/0OsP6nPfakXpi50C7dcoHXlc=
 modernc.org/opt v0.1.1 h1:/0RX92k9vwVeDXj+Xn23DKp2VJubL7k8qNffND6qn3A=
 modernc.org/opt v0.1.1/go.mod h1:WdSiB5evDcignE70guQKxYUl14mgWtbClRi5wmkkTX0=
 modernc.org/sqlite v1.10.1-0.20210314190707-798bbeb9bb84 h1:rgEUzE849tFlHSoeCrKyS9cZAljC+DY7MdMHKq6R6sY=
 modernc.org/sqlite v1.10.1-0.20210314190707-798bbeb9bb84/go.mod h1:PGzq6qlhyYjL6uVbSgS6WoF7ZopTW/sI7+7p+mb4ZVU=
+modernc.org/sqlite v1.11.2 h1:ShWQpeD3ag/bmx6TqidBlIWonWmQaSQKls3aenCbt+w=
+modernc.org/sqlite v1.11.2/go.mod h1:+mhs/P1ONd+6G7hcAs6irwDi/bjTQ7nLW6LHRBsEa3A=
 modernc.org/strutil v1.1.0 h1:+1/yCzZxY2pZwwrsbH+4T7BQMoLQ9QiBshRC9eicYsc=
 modernc.org/strutil v1.1.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs=
+modernc.org/strutil v1.1.1 h1:xv+J1BXY3Opl2ALrBwyfEikFAj8pmqcpnfmuwUwcozs=
+modernc.org/strutil v1.1.1/go.mod h1:DE+MQQ/hjKBZS2zNInV5hhcipt5rLPWkmpbGeW5mmdw=
 modernc.org/tcl v1.5.0 h1:euZSUNfE0Fd4W8VqXI1Ly1v7fqDJoBuAV88Ea+SnaSs=
 modernc.org/tcl v1.5.0/go.mod h1:gb57hj4pO8fRrK54zveIfFXBaMHK3SKJNWcmRw1cRzc=
+modernc.org/tcl v1.5.5/go.mod h1:ADkaTUuwukkrlhqwERyq0SM8OvyXo7+TjFz7yAF56EI=
 modernc.org/token v1.0.0 h1:a0jaWiNMDhDUtqOj09wvjWWAqd3q7WpBulmL9H2egsk=
 modernc.org/token v1.0.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
 modernc.org/z v1.0.1-0.20210308123920-1f282aa71362/go.mod h1:8/SRk5C/HgiQWCgXdfpb+1RvhORdkz5sw72d3jjtyqA=
@@ -128,3 +161,5 @@ modernc.org/z v1.0.1 h1:WyIDpEpAIx4Hel6q/Pcgj/VhaQV5XPJ2I6ryIYbjnpc=
 modernc.org/z v1.0.1/go.mod h1:8/SRk5C/HgiQWCgXdfpb+1RvhORdkz5sw72d3jjtyqA=
 xorm.io/builder v0.3.8 h1:P/wPgRqa9kX5uE0aA1/ukJ23u9KH0aSRpHLwDKXigSE=
 xorm.io/builder v0.3.8/go.mod h1:aUW0S9eb9VCaPohFCH3j7czOx1PMW3i1HrSzbLYGBSE=
+xorm.io/builder v0.3.9 h1:Sd65/LdWyO7LR8+Cbd+e7mm3sK/7U9k0jS3999IDHMc=
+xorm.io/builder v0.3.9/go.mod h1:aUW0S9eb9VCaPohFCH3j7czOx1PMW3i1HrSzbLYGBSE=
diff --git a/integrations/engine_test.go b/integrations/engine_test.go
index a06d91aa..b5ecb2c2 100644
--- a/integrations/engine_test.go
+++ b/integrations/engine_test.go
@@ -174,6 +174,18 @@ func TestDumpTables(t *testing.T) {
 			assert.NoError(t, testEngine.(*xorm.Engine).DumpTablesToFile([]*schemas.Table{tb}, name, tp))
 		})
 	}
+
+	assert.NoError(t, testEngine.DropTables(new(TestDumpTableStruct)))
+
+	importPath := fmt.Sprintf("dump_%v-table.sql", testEngine.Dialect().URI().DBType)
+	t.Run("import_"+importPath, func(t *testing.T) {
+		sess := testEngine.NewSession()
+		defer sess.Close()
+		assert.NoError(t, sess.Begin())
+		_, err = sess.ImportFile(importPath)
+		assert.NoError(t, err)
+		assert.NoError(t, sess.Commit())
+	})
 }
 
 func TestDumpTables2(t *testing.T) {
diff --git a/integrations/performance_test.go b/integrations/performance_test.go
new file mode 100644
index 00000000..4b54b40c
--- /dev/null
+++ b/integrations/performance_test.go
@@ -0,0 +1,104 @@
+// Copyright 2021 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package integrations
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func BenchmarkGetVars(b *testing.B) {
+	b.StopTimer()
+
+	assert.NoError(b, PrepareEngine())
+	testEngine.ShowSQL(false)
+
+	type BenchmarkGetVars struct {
+		Id   int64
+		Name string
+	}
+
+	assert.NoError(b, testEngine.Sync2(new(BenchmarkGetVars)))
+
+	var v = BenchmarkGetVars{
+		Name: "myname",
+	}
+	_, err := testEngine.Insert(&v)
+	assert.NoError(b, err)
+
+	b.StartTimer()
+	var myname string
+	for i := 0; i < b.N; i++ {
+		has, err := testEngine.Cols("name").Table("benchmark_get_vars").Where("id=?", v.Id).Get(&myname)
+		b.StopTimer()
+		myname = ""
+		assert.True(b, has)
+		assert.NoError(b, err)
+		b.StartTimer()
+	}
+}
+
+func BenchmarkGetStruct(b *testing.B) {
+	b.StopTimer()
+
+	assert.NoError(b, PrepareEngine())
+	testEngine.ShowSQL(false)
+
+	type BenchmarkGetStruct struct {
+		Id   int64
+		Name string
+	}
+
+	assert.NoError(b, testEngine.Sync2(new(BenchmarkGetStruct)))
+
+	var v = BenchmarkGetStruct{
+		Name: "myname",
+	}
+	_, err := testEngine.Insert(&v)
+	assert.NoError(b, err)
+
+	b.StartTimer()
+	var myname BenchmarkGetStruct
+	for i := 0; i < b.N; i++ {
+		has, err := testEngine.ID(v.Id).Get(&myname)
+		b.StopTimer()
+		myname.Id = 0
+		myname.Name = ""
+		assert.True(b, has)
+		assert.NoError(b, err)
+		b.StartTimer()
+	}
+}
+
+func BenchmarkFindStruct(b *testing.B) {
+	b.StopTimer()
+
+	assert.NoError(b, PrepareEngine())
+	testEngine.ShowSQL(false)
+
+	type BenchmarkFindStruct struct {
+		Id   int64
+		Name string
+	}
+
+	assert.NoError(b, testEngine.Sync2(new(BenchmarkFindStruct)))
+
+	var v = BenchmarkFindStruct{
+		Name: "myname",
+	}
+	_, err := testEngine.Insert(&v)
+	assert.NoError(b, err)
+
+	b.StartTimer()
+	var mynames = make([]BenchmarkFindStruct, 0, 1)
+	for i := 0; i < b.N; i++ {
+		err := testEngine.Find(&mynames)
+		b.StopTimer()
+		mynames = make([]BenchmarkFindStruct, 0, 1)
+		assert.NoError(b, err)
+		b.StartTimer()
+	}
+}
diff --git a/integrations/session_delete_test.go b/integrations/session_delete_test.go
index cc7e861d..56f6f5b8 100644
--- a/integrations/session_delete_test.go
+++ b/integrations/session_delete_test.go
@@ -241,3 +241,28 @@ func TestUnscopeDelete(t *testing.T) {
 	assert.NoError(t, err)
 	assert.False(t, has)
 }
+
+func TestDelete2(t *testing.T) {
+	assert.NoError(t, PrepareEngine())
+
+	type UserinfoDelete2 struct {
+		Uid   int64 `xorm:"id pk not null autoincr"`
+		IsMan bool
+	}
+
+	assert.NoError(t, testEngine.Sync2(new(UserinfoDelete2)))
+
+	user := UserinfoDelete2{}
+	cnt, err := testEngine.Insert(&user)
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	cnt, err = testEngine.Table("userinfo_delete2").In("id", []int{1}).Delete()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	user2 := UserinfoDelete2{}
+	has, err := testEngine.ID(1).Get(&user2)
+	assert.NoError(t, err)
+	assert.False(t, has)
+}
diff --git a/integrations/session_find_test.go b/integrations/session_find_test.go
index 0ea12e26..80f3b72c 100644
--- a/integrations/session_find_test.go
+++ b/integrations/session_find_test.go
@@ -406,16 +406,16 @@ func TestFindMapPtrString(t *testing.T) {
 	assert.NoError(t, err)
 }
 
-func TestFindBit(t *testing.T) {
-	type FindBitStruct struct {
+func TestFindBool(t *testing.T) {
+	type FindBoolStruct struct {
 		Id  int64
-		Msg bool `xorm:"bit"`
+		Msg bool
 	}
 
 	assert.NoError(t, PrepareEngine())
-	assertSync(t, new(FindBitStruct))
+	assertSync(t, new(FindBoolStruct))
 
-	cnt, err := testEngine.Insert([]FindBitStruct{
+	cnt, err := testEngine.Insert([]FindBoolStruct{
 		{
 			Msg: false,
 		},
@@ -426,14 +426,13 @@ func TestFindBit(t *testing.T) {
 	assert.NoError(t, err)
 	assert.EqualValues(t, 2, cnt)
 
-	var results = make([]FindBitStruct, 0, 2)
+	var results = make([]FindBoolStruct, 0, 2)
 	err = testEngine.Find(&results)
 	assert.NoError(t, err)
 	assert.EqualValues(t, 2, len(results))
 }
 
 func TestFindMark(t *testing.T) {
-
 	type Mark struct {
 		Mark1 string `xorm:"VARCHAR(1)"`
 		Mark2 string `xorm:"VARCHAR(1)"`
@@ -468,7 +467,7 @@ func TestFindAndCountOneFunc(t *testing.T) {
 	type FindAndCountStruct struct {
 		Id      int64
 		Content string
-		Msg     bool `xorm:"bit"`
+		Msg     bool
 	}
 
 	assert.NoError(t, PrepareEngine())
diff --git a/integrations/session_get_test.go b/integrations/session_get_test.go
index 99db98fc..d3ce2a11 100644
--- a/integrations/session_get_test.go
+++ b/integrations/session_get_test.go
@@ -8,6 +8,7 @@ import (
 	"database/sql"
 	"errors"
 	"fmt"
+	"math/big"
 	"strconv"
 	"testing"
 	"time"
@@ -16,6 +17,7 @@ import (
 	"xorm.io/xorm/contexts"
 	"xorm.io/xorm/schemas"
 
+	"github.com/shopspring/decimal"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -345,6 +347,29 @@ func TestGetSlice(t *testing.T) {
 	assert.Error(t, err)
 }
 
+func TestGetMap(t *testing.T) {
+	assert.NoError(t, PrepareEngine())
+
+	type UserinfoMap struct {
+		Uid   int `xorm:"pk autoincr"`
+		IsMan bool
+	}
+
+	assertSync(t, new(UserinfoMap))
+
+	tableName := testEngine.Quote(testEngine.TableName("userinfo_map", true))
+	_, err := testEngine.Exec(fmt.Sprintf("INSERT INTO %s (is_man) VALUES (NULL)", tableName))
+	assert.NoError(t, err)
+
+	var valuesString = make(map[string]string)
+	has, err := testEngine.Table("userinfo_map").Get(&valuesString)
+	assert.NoError(t, err)
+	assert.Equal(t, true, has)
+	assert.Equal(t, 2, len(valuesString))
+	assert.Equal(t, "1", valuesString["uid"])
+	assert.Equal(t, "", valuesString["is_man"])
+}
+
 func TestGetError(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 
@@ -766,3 +791,141 @@ func TestGetNil(t *testing.T) {
 	assert.True(t, errors.Is(err, xorm.ErrObjectIsNil))
 	assert.False(t, has)
 }
+
+func TestGetBigFloat(t *testing.T) {
+	type GetBigFloat struct {
+		Id    int64
+		Money *big.Float `xorm:"numeric(22,2)"`
+	}
+
+	assert.NoError(t, PrepareEngine())
+	assertSync(t, new(GetBigFloat))
+
+	{
+		var gf = GetBigFloat{
+			Money: big.NewFloat(999999.99),
+		}
+		_, err := testEngine.Insert(&gf)
+		assert.NoError(t, err)
+
+		var m big.Float
+		has, err := testEngine.Table("get_big_float").Cols("money").Where("id=?", gf.Id).Get(&m)
+		assert.NoError(t, err)
+		assert.True(t, has)
+		assert.True(t, m.String() == gf.Money.String(), "%v != %v", m.String(), gf.Money.String())
+		//fmt.Println(m.Cmp(gf.Money))
+		//assert.True(t, m.Cmp(gf.Money) == 0, "%v != %v", m.String(), gf.Money.String())
+	}
+
+	type GetBigFloat2 struct {
+		Id     int64
+		Money  *big.Float `xorm:"decimal(22,2)"`
+		Money2 big.Float  `xorm:"decimal(22,2)"`
+	}
+
+	assert.NoError(t, PrepareEngine())
+	assertSync(t, new(GetBigFloat2))
+
+	{
+		var gf2 = GetBigFloat2{
+			Money:  big.NewFloat(9999999.99),
+			Money2: *big.NewFloat(99.99),
+		}
+		_, err := testEngine.Insert(&gf2)
+		assert.NoError(t, err)
+
+		var m2 big.Float
+		has, err := testEngine.Table("get_big_float2").Cols("money").Where("id=?", gf2.Id).Get(&m2)
+		assert.NoError(t, err)
+		assert.True(t, has)
+		assert.True(t, m2.String() == gf2.Money.String(), "%v != %v", m2.String(), gf2.Money.String())
+		//fmt.Println(m.Cmp(gf.Money))
+		//assert.True(t, m.Cmp(gf.Money) == 0, "%v != %v", m.String(), gf.Money.String())
+
+		var gf3 GetBigFloat2
+		has, err = testEngine.ID(gf2.Id).Get(&gf3)
+		assert.NoError(t, err)
+		assert.True(t, has)
+		assert.True(t, gf3.Money.String() == gf2.Money.String(), "%v != %v", gf3.Money.String(), gf2.Money.String())
+		assert.True(t, gf3.Money2.String() == gf2.Money2.String(), "%v != %v", gf3.Money2.String(), gf2.Money2.String())
+
+		var gfs []GetBigFloat2
+		err = testEngine.Find(&gfs)
+		assert.NoError(t, err)
+		assert.EqualValues(t, 1, len(gfs))
+		assert.True(t, gfs[0].Money.String() == gf2.Money.String(), "%v != %v", gfs[0].Money.String(), gf2.Money.String())
+		assert.True(t, gfs[0].Money2.String() == gf2.Money2.String(), "%v != %v", gfs[0].Money2.String(), gf2.Money2.String())
+	}
+}
+
+func TestGetDecimal(t *testing.T) {
+	type GetDecimal struct {
+		Id    int64
+		Money decimal.Decimal `xorm:"decimal(22,2)"`
+	}
+
+	assert.NoError(t, PrepareEngine())
+	assertSync(t, new(GetDecimal))
+
+	{
+		var gf = GetDecimal{
+			Money: decimal.NewFromFloat(999999.99),
+		}
+		_, err := testEngine.Insert(&gf)
+		assert.NoError(t, err)
+
+		var m decimal.Decimal
+		has, err := testEngine.Table("get_decimal").Cols("money").Where("id=?", gf.Id).Get(&m)
+		assert.NoError(t, err)
+		assert.True(t, has)
+		assert.True(t, m.String() == gf.Money.String(), "%v != %v", m.String(), gf.Money.String())
+		//fmt.Println(m.Cmp(gf.Money))
+		//assert.True(t, m.Cmp(gf.Money) == 0, "%v != %v", m.String(), gf.Money.String())
+	}
+
+	type GetDecimal2 struct {
+		Id    int64
+		Money *decimal.Decimal `xorm:"decimal(22,2)"`
+	}
+
+	assert.NoError(t, PrepareEngine())
+	assertSync(t, new(GetDecimal2))
+
+	{
+		v := decimal.NewFromFloat(999999.99)
+		var gf = GetDecimal2{
+			Money: &v,
+		}
+		_, err := testEngine.Insert(&gf)
+		assert.NoError(t, err)
+
+		var m decimal.Decimal
+		has, err := testEngine.Table("get_decimal2").Cols("money").Where("id=?", gf.Id).Get(&m)
+		assert.NoError(t, err)
+		assert.True(t, has)
+		assert.True(t, m.String() == gf.Money.String(), "%v != %v", m.String(), gf.Money.String())
+		//fmt.Println(m.Cmp(gf.Money))
+		//assert.True(t, m.Cmp(gf.Money) == 0, "%v != %v", m.String(), gf.Money.String())
+	}
+}
+func TestGetTime(t *testing.T) {
+	type GetTimeStruct struct {
+		Id         int64
+		CreateTime time.Time
+	}
+
+	assert.NoError(t, PrepareEngine())
+	assertSync(t, new(GetTimeStruct))
+
+	var gts = GetTimeStruct{
+		CreateTime: time.Now().In(testEngine.GetTZLocation()),
+	}
+	_, err := testEngine.Insert(&gts)
+	assert.NoError(t, err)
+
+	var gn time.Time
+	has, err := testEngine.Table("get_time_struct").Cols(colMapper.Obj2Table("CreateTime")).Get(&gn)
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.EqualValues(t, gts.CreateTime.Format(time.RFC3339), gn.Format(time.RFC3339))
+}
diff --git a/integrations/session_insert_test.go b/integrations/session_insert_test.go
index e5d880ae..ce52d3c4 100644
--- a/integrations/session_insert_test.go
+++ b/integrations/session_insert_test.go
@@ -168,17 +168,17 @@ func TestInsertAutoIncr(t *testing.T) {
 	assert.Greater(t, user.Uid, int64(0))
 }
 
-type DefaultInsert struct {
-	Id      int64
-	Status  int `xorm:"default -1"`
-	Name    string
-	Created time.Time `xorm:"created"`
-	Updated time.Time `xorm:"updated"`
-}
-
 func TestInsertDefault(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 
+	type DefaultInsert struct {
+		Id      int64
+		Status  int `xorm:"default -1"`
+		Name    string
+		Created time.Time `xorm:"created"`
+		Updated time.Time `xorm:"updated"`
+	}
+
 	di := new(DefaultInsert)
 	err := testEngine.Sync2(di)
 	assert.NoError(t, err)
@@ -195,16 +195,16 @@ func TestInsertDefault(t *testing.T) {
 	assert.EqualValues(t, di2.Created.Unix(), di.Created.Unix())
 }
 
-type DefaultInsert2 struct {
-	Id        int64
-	Name      string
-	Url       string    `xorm:"text"`
-	CheckTime time.Time `xorm:"not null default '2000-01-01 00:00:00' TIMESTAMP"`
-}
-
 func TestInsertDefault2(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 
+	type DefaultInsert2 struct {
+		Id        int64
+		Name      string
+		Url       string    `xorm:"text"`
+		CheckTime time.Time `xorm:"not null default '2000-01-01 00:00:00'"`
+	}
+
 	di := new(DefaultInsert2)
 	err := testEngine.Sync2(di)
 	assert.NoError(t, err)
@@ -1024,3 +1024,44 @@ func TestInsertIntSlice(t *testing.T) {
 	assert.True(t, has)
 	assert.EqualValues(t, v3, v4)
 }
+
+func TestInsertDeleted(t *testing.T) {
+	assert.NoError(t, PrepareEngine())
+
+	type InsertDeletedStructNotRight struct {
+		ID        uint64    `xorm:"'ID' pk autoincr"`
+		DeletedAt time.Time `xorm:"'DELETED_AT' deleted notnull"`
+	}
+	// notnull tag will be ignored
+	err := testEngine.Sync2(new(InsertDeletedStructNotRight))
+	assert.NoError(t, err)
+
+	type InsertDeletedStruct struct {
+		ID        uint64    `xorm:"'ID' pk autoincr"`
+		DeletedAt time.Time `xorm:"'DELETED_AT' deleted"`
+	}
+
+	assert.NoError(t, testEngine.Sync2(new(InsertDeletedStruct)))
+
+	var v InsertDeletedStruct
+	_, err = testEngine.Insert(&v)
+	assert.NoError(t, err)
+
+	var v2 InsertDeletedStruct
+	has, err := testEngine.Get(&v2)
+	assert.NoError(t, err)
+	assert.True(t, has)
+
+	_, err = testEngine.ID(v.ID).Delete(new(InsertDeletedStruct))
+	assert.NoError(t, err)
+
+	var v3 InsertDeletedStruct
+	has, err = testEngine.Get(&v3)
+	assert.NoError(t, err)
+	assert.False(t, has)
+
+	var v4 InsertDeletedStruct
+	has, err = testEngine.Unscoped().Get(&v4)
+	assert.NoError(t, err)
+	assert.True(t, has)
+}
diff --git a/integrations/session_pk_test.go b/integrations/session_pk_test.go
index d5f23491..8f7dcb55 100644
--- a/integrations/session_pk_test.go
+++ b/integrations/session_pk_test.go
@@ -173,6 +173,16 @@ func TestUintId(t *testing.T) {
 	err = testEngine.CreateTables(&UintId{})
 	assert.NoError(t, err)
 
+	tables, err := testEngine.DBMetas()
+	assert.NoError(t, err)
+
+	assert.EqualValues(t, 1, len(tables))
+	cols := tables[0].PKColumns()
+	assert.EqualValues(t, 1, len(cols))
+	if testEngine.Dialect().URI().DBType == schemas.MYSQL {
+		assert.EqualValues(t, "UNSIGNED INT", cols[0].SQLType.Name)
+	}
+
 	cnt, err := testEngine.Insert(&UintId{Name: "test"})
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, cnt)
diff --git a/integrations/session_query_test.go b/integrations/session_query_test.go
index 30f2e6ab..ed03ff3e 100644
--- a/integrations/session_query_test.go
+++ b/integrations/session_query_test.go
@@ -52,7 +52,7 @@ func TestQueryString2(t *testing.T) {
 
 	type GetVar3 struct {
 		Id  int64 `xorm:"autoincr pk"`
-		Msg bool  `xorm:"bit"`
+		Msg bool
 	}
 
 	assert.NoError(t, testEngine.Sync2(new(GetVar3)))
@@ -107,6 +107,16 @@ func toFloat64(i interface{}) float64 {
 	return 0
 }
 
+func toBool(i interface{}) bool {
+	switch t := i.(type) {
+	case int32:
+		return t > 0
+	case bool:
+		return t
+	}
+	return false
+}
+
 func TestQueryInterface(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 
@@ -132,10 +142,10 @@ func TestQueryInterface(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, 1, len(records))
 	assert.Equal(t, 5, len(records[0]))
-	assert.EqualValues(t, 1, toInt64(records[0]["id"]))
-	assert.Equal(t, "hi", toString(records[0]["msg"]))
-	assert.EqualValues(t, 28, toInt64(records[0]["age"]))
-	assert.EqualValues(t, 1.5, toFloat64(records[0]["money"]))
+	assert.EqualValues(t, int64(1), records[0]["id"])
+	assert.Equal(t, "hi", records[0]["msg"])
+	assert.EqualValues(t, 28, records[0]["age"])
+	assert.EqualValues(t, 1.5, records[0]["money"])
 }
 
 func TestQueryNoParams(t *testing.T) {
@@ -192,7 +202,7 @@ func TestQueryStringNoParam(t *testing.T) {
 
 	type GetVar4 struct {
 		Id  int64 `xorm:"autoincr pk"`
-		Msg bool  `xorm:"bit"`
+		Msg bool
 	}
 
 	assert.NoError(t, testEngine.Sync2(new(GetVar4)))
@@ -229,7 +239,7 @@ func TestQuerySliceStringNoParam(t *testing.T) {
 
 	type GetVar6 struct {
 		Id  int64 `xorm:"autoincr pk"`
-		Msg bool  `xorm:"bit"`
+		Msg bool
 	}
 
 	assert.NoError(t, testEngine.Sync2(new(GetVar6)))
@@ -266,7 +276,7 @@ func TestQueryInterfaceNoParam(t *testing.T) {
 
 	type GetVar5 struct {
 		Id  int64 `xorm:"autoincr pk"`
-		Msg bool  `xorm:"bit"`
+		Msg bool
 	}
 
 	assert.NoError(t, testEngine.Sync2(new(GetVar5)))
@@ -280,14 +290,14 @@ func TestQueryInterfaceNoParam(t *testing.T) {
 	records, err := testEngine.Table("get_var5").Limit(1).QueryInterface()
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, len(records))
-	assert.EqualValues(t, 1, toInt64(records[0]["id"]))
-	assert.EqualValues(t, 0, toInt64(records[0]["msg"]))
+	assert.EqualValues(t, 1, records[0]["id"])
+	assert.False(t, toBool(records[0]["msg"]))
 
 	records, err = testEngine.Table("get_var5").Where(builder.Eq{"id": 1}).QueryInterface()
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, len(records))
-	assert.EqualValues(t, 1, toInt64(records[0]["id"]))
-	assert.EqualValues(t, 0, toInt64(records[0]["msg"]))
+	assert.EqualValues(t, 1, records[0]["id"])
+	assert.False(t, toBool(records[0]["msg"]))
 }
 
 func TestQueryWithBuilder(t *testing.T) {
diff --git a/integrations/session_raw_test.go b/integrations/session_raw_test.go
index 8b9d6766..36677683 100644
--- a/integrations/session_raw_test.go
+++ b/integrations/session_raw_test.go
@@ -7,6 +7,7 @@ package integrations
 import (
 	"strconv"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -35,3 +36,32 @@ func TestExecAndQuery(t *testing.T) {
 	assert.EqualValues(t, 1, id)
 	assert.Equal(t, "user", string(results[0]["name"]))
 }
+
+func TestExecTime(t *testing.T) {
+	assert.NoError(t, PrepareEngine())
+
+	type UserinfoExecTime struct {
+		Uid     int
+		Name    string
+		Created time.Time
+	}
+
+	assert.NoError(t, testEngine.Sync2(new(UserinfoExecTime)))
+	now := time.Now()
+	res, err := testEngine.Exec("INSERT INTO "+testEngine.TableName("`userinfo_exec_time`", true)+" (uid, name, created) VALUES (?, ?, ?)", 1, "user", now)
+	assert.NoError(t, err)
+	cnt, err := res.RowsAffected()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	results, err := testEngine.QueryString("SELECT * FROM " + testEngine.TableName("`userinfo_exec_time`", true))
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, len(results))
+	assert.EqualValues(t, now.In(testEngine.GetTZLocation()).Format("2006-01-02 15:04:05"), results[0]["created"])
+
+	var uet UserinfoExecTime
+	has, err := testEngine.Where("uid=?", 1).Get(&uet)
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.EqualValues(t, now.In(testEngine.GetTZLocation()).Format("2006-01-02 15:04:05"), uet.Created.Format("2006-01-02 15:04:05"))
+}
diff --git a/integrations/session_schema_test.go b/integrations/session_schema_test.go
index 28c75119..9cbebcbf 100644
--- a/integrations/session_schema_test.go
+++ b/integrations/session_schema_test.go
@@ -286,6 +286,19 @@ func TestSyncTable3(t *testing.T) {
 	}
 }
 
+func TestSyncTable4(t *testing.T) {
+	type SyncTable6 struct {
+		Id  int64
+		Qty float64 `xorm:"numeric(36,2)"`
+	}
+
+	assert.NoError(t, PrepareEngine())
+
+	assert.NoError(t, testEngine.Sync2(new(SyncTable6)))
+
+	assert.NoError(t, testEngine.Sync2(new(SyncTable6)))
+}
+
 func TestIsTableExist(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 
diff --git a/integrations/session_update_test.go b/integrations/session_update_test.go
index 796bfa0a..cc1042b6 100644
--- a/integrations/session_update_test.go
+++ b/integrations/session_update_test.go
@@ -1313,7 +1313,6 @@ func TestUpdateIgnoreOnlyFromDBFields(t *testing.T) {
 		assert.EqualValues(t, true, has)
 		assert.EqualValues(t, "", record.OnlyFromDBField)
 		return &record
-
 	}
 	assert.NoError(t, PrepareEngine())
 	assertSync(t, new(TestOnlyFromDBField))
@@ -1396,15 +1395,22 @@ func TestNilFromDB(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 	assertSync(t, new(TestTable1))
 
-	cnt, err := testEngine.Insert(&TestTable1{
+	var tt0 = TestTable1{
 		Field1: &TestFieldType1{
 			cb: []byte("string"),
 		},
 		UpdateTime: time.Now(),
-	})
+	}
+	cnt, err := testEngine.Insert(&tt0)
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, cnt)
 
+	var tt1 TestTable1
+	has, err := testEngine.ID(tt0.Id).Get(&tt1)
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.EqualValues(t, "string", string(tt1.Field1.cb))
+
 	cnt, err = testEngine.Update(TestTable1{
 		UpdateTime: time.Now().Add(time.Second),
 	}, TestTable1{
@@ -1418,4 +1424,37 @@ func TestNilFromDB(t *testing.T) {
 	})
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, cnt)
+
+	var tt = TestTable1{
+		UpdateTime: time.Now(),
+		Field1: &TestFieldType1{
+			cb: nil,
+		},
+	}
+	cnt, err = testEngine.Insert(&tt)
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	var tt2 TestTable1
+	has, err = testEngine.ID(tt.Id).Get(&tt2)
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.Nil(t, tt2.Field1)
+
+	var tt3 = TestTable1{
+		UpdateTime: time.Now(),
+		Field1: &TestFieldType1{
+			cb: []byte{},
+		},
+	}
+	cnt, err = testEngine.Insert(&tt3)
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	var tt4 TestTable1
+	has, err = testEngine.ID(tt3.Id).Get(&tt4)
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.NotNil(t, tt4.Field1)
+	assert.NotNil(t, tt4.Field1.cb)
 }
diff --git a/integrations/time_test.go b/integrations/time_test.go
index 6d8d812c..50fd1847 100644
--- a/integrations/time_test.go
+++ b/integrations/time_test.go
@@ -53,9 +53,18 @@ func TestTimeUserTimeDiffLoc(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 	loc, err := time.LoadLocation("Asia/Shanghai")
 	assert.NoError(t, err)
+	oldTZLoc := testEngine.GetTZLocation()
+	defer func() {
+		testEngine.SetTZLocation(oldTZLoc)
+	}()
 	testEngine.SetTZLocation(loc)
+
 	dbLoc, err := time.LoadLocation("America/New_York")
 	assert.NoError(t, err)
+	oldDBLoc := testEngine.GetTZDatabase()
+	defer func() {
+		testEngine.SetTZDatabase(oldDBLoc)
+	}()
 	testEngine.SetTZDatabase(dbLoc)
 
 	type TimeUser2 struct {
@@ -118,9 +127,18 @@ func TestTimeUserCreatedDiffLoc(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 	loc, err := time.LoadLocation("Asia/Shanghai")
 	assert.NoError(t, err)
+	oldTZLoc := testEngine.GetTZLocation()
+	defer func() {
+		testEngine.SetTZLocation(oldTZLoc)
+	}()
 	testEngine.SetTZLocation(loc)
+
 	dbLoc, err := time.LoadLocation("America/New_York")
 	assert.NoError(t, err)
+	oldDBLoc := testEngine.GetTZDatabase()
+	defer func() {
+		testEngine.SetTZDatabase(oldDBLoc)
+	}()
 	testEngine.SetTZDatabase(dbLoc)
 
 	type UserCreated2 struct {
@@ -204,9 +222,18 @@ func TestTimeUserUpdatedDiffLoc(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 	loc, err := time.LoadLocation("Asia/Shanghai")
 	assert.NoError(t, err)
+	oldTZLoc := testEngine.GetTZLocation()
+	defer func() {
+		testEngine.SetTZLocation(oldTZLoc)
+	}()
 	testEngine.SetTZLocation(loc)
+
 	dbLoc, err := time.LoadLocation("America/New_York")
 	assert.NoError(t, err)
+	oldDBLoc := testEngine.GetTZDatabase()
+	defer func() {
+		testEngine.SetTZDatabase(oldDBLoc)
+	}()
 	testEngine.SetTZDatabase(dbLoc)
 
 	type UserUpdated2 struct {
@@ -311,9 +338,18 @@ func TestTimeUserDeletedDiffLoc(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 	loc, err := time.LoadLocation("Asia/Shanghai")
 	assert.NoError(t, err)
+	oldTZLoc := testEngine.GetTZLocation()
+	defer func() {
+		testEngine.SetTZLocation(oldTZLoc)
+	}()
 	testEngine.SetTZLocation(loc)
+
 	dbLoc, err := time.LoadLocation("America/New_York")
 	assert.NoError(t, err)
+	oldDBLoc := testEngine.GetTZDatabase()
+	defer func() {
+		testEngine.SetTZDatabase(oldDBLoc)
+	}()
 	testEngine.SetTZDatabase(dbLoc)
 
 	type UserDeleted2 struct {
@@ -435,9 +471,18 @@ func TestCustomTimeUserDeletedDiffLoc(t *testing.T) {
 	assert.NoError(t, PrepareEngine())
 	loc, err := time.LoadLocation("Asia/Shanghai")
 	assert.NoError(t, err)
+	oldTZLoc := testEngine.GetTZLocation()
+	defer func() {
+		testEngine.SetTZLocation(oldTZLoc)
+	}()
 	testEngine.SetTZLocation(loc)
+
 	dbLoc, err := time.LoadLocation("America/New_York")
 	assert.NoError(t, err)
+	oldDBLoc := testEngine.GetTZDatabase()
+	defer func() {
+		testEngine.SetTZDatabase(oldDBLoc)
+	}()
 	testEngine.SetTZDatabase(dbLoc)
 
 	type UserDeleted4 struct {
diff --git a/integrations/types_null_test.go b/integrations/types_null_test.go
index 98bd86b9..86ce1939 100644
--- a/integrations/types_null_test.go
+++ b/integrations/types_null_test.go
@@ -7,7 +7,6 @@ package integrations
 import (
 	"database/sql"
 	"database/sql/driver"
-	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -42,15 +41,22 @@ func (m *CustomStruct) Scan(value interface{}) error {
 		return nil
 	}
 
-	if s, ok := value.([]byte); ok {
-		seps := strings.Split(string(s), "/")
+	var s string
+	switch t := value.(type) {
+	case string:
+		s = t
+	case []byte:
+		s = string(t)
+	}
+	if len(s) > 0 {
+		seps := strings.Split(s, "/")
 		m.Year, _ = strconv.Atoi(seps[0])
 		m.Month, _ = strconv.Atoi(seps[1])
 		m.Day, _ = strconv.Atoi(seps[2])
 		return nil
 	}
 
-	return errors.New("scan data not fit []byte")
+	return fmt.Errorf("scan data %#v not fit []byte", value)
 }
 
 func (m CustomStruct) Value() (driver.Value, error) {
diff --git a/integrations/types_test.go b/integrations/types_test.go
index af923cbc..2e2cf97e 100644
--- a/integrations/types_test.go
+++ b/integrations/types_test.go
@@ -176,13 +176,39 @@ func (s *SliceType) ToDB() ([]byte, error) {
 	return json.DefaultJSONHandler.Marshal(s)
 }
 
+type Nullable struct {
+	Data string
+}
+
+func (s *Nullable) FromDB(data []byte) error {
+	if data == nil {
+		return nil
+	}
+
+	*s = Nullable{
+		Data: string(data),
+	}
+
+	return nil
+}
+
+func (s *Nullable) ToDB() ([]byte, error) {
+	if s == nil {
+		return nil, nil
+	}
+
+	return []byte(s.Data), nil
+}
+
 type ConvStruct struct {
-	Conv  ConvString
-	Conv2 *ConvString
-	Cfg1  ConvConfig
-	Cfg2  *ConvConfig        `xorm:"TEXT"`
-	Cfg3  convert.Conversion `xorm:"BLOB"`
-	Slice SliceType
+	Conv      ConvString
+	Conv2     *ConvString
+	Cfg1      ConvConfig
+	Cfg2      *ConvConfig        `xorm:"TEXT"`
+	Cfg3      convert.Conversion `xorm:"BLOB"`
+	Slice     SliceType
+	Nullable1 *Nullable `xorm:"null"`
+	Nullable2 *Nullable `xorm:"null"`
 }
 
 func (c *ConvStruct) BeforeSet(name string, cell xorm.Cell) {
@@ -205,8 +231,10 @@ func TestConversion(t *testing.T) {
 	c.Cfg2 = &ConvConfig{"xx", 2}
 	c.Cfg3 = &ConvConfig{"zz", 3}
 	c.Slice = []*ConvConfig{{"yy", 4}, {"ff", 5}}
+	c.Nullable1 = &Nullable{Data: "test"}
+	c.Nullable2 = nil
 
-	_, err := testEngine.Insert(c)
+	_, err := testEngine.Nullable("nullable2").Insert(c)
 	assert.NoError(t, err)
 
 	c1 := new(ConvStruct)
@@ -248,6 +276,9 @@ func TestConversion(t *testing.T) {
 	assert.EqualValues(t, 2, len(c2.Slice))
 	assert.EqualValues(t, *c.Slice[0], *c2.Slice[0])
 	assert.EqualValues(t, *c.Slice[1], *c2.Slice[1])
+	assert.NotNil(t, c1.Nullable1)
+	assert.Equal(t, c1.Nullable1.Data, "test")
+	assert.Nil(t, c1.Nullable2)
 }
 
 type MyInt int
diff --git a/interface.go b/interface.go
index d31323ff..5d68f536 100644
--- a/interface.go
+++ b/interface.go
@@ -30,7 +30,7 @@ type Interface interface {
 	CreateUniques(bean interface{}) error
 	Decr(column string, arg ...interface{}) *Session
 	Desc(...string) *Session
-	Delete(interface{}) (int64, error)
+	Delete(...interface{}) (int64, error)
 	Distinct(columns ...string) *Session
 	DropIndexes(bean interface{}) error
 	Exec(sqlOrArgs ...interface{}) (sql.Result, error)
@@ -51,6 +51,7 @@ type Interface interface {
 	MustCols(columns ...string) *Session
 	NoAutoCondition(...bool) *Session
 	NotIn(string, ...interface{}) *Session
+	Nullable(...string) *Session
 	Join(joinOperator string, tablename interface{}, condition string, args ...interface{}) *Session
 	Omit(columns ...string) *Session
 	OrderBy(order string) *Session
diff --git a/internal/json/gojson.go b/internal/json/gojson.go
new file mode 100644
index 00000000..4f1448e7
--- /dev/null
+++ b/internal/json/gojson.go
@@ -0,0 +1,28 @@
+// Copyright 2021 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build gojson
+
+package json
+
+import (
+	gojson "github.com/goccy/go-json"
+)
+
+func init() {
+	DefaultJSONHandler = GOjson{}
+}
+
+// GOjson implements JSONInterface via gojson
+type GOjson struct{}
+
+// Marshal implements JSONInterface
+func (GOjson) Marshal(v interface{}) ([]byte, error) {
+	return gojson.Marshal(v)
+}
+
+// Unmarshal implements JSONInterface
+func (GOjson) Unmarshal(data []byte, v interface{}) error {
+	return gojson.Unmarshal(data, v)
+}
diff --git a/internal/statements/insert.go b/internal/statements/insert.go
index 367dbdc9..4e43c5bd 100644
--- a/internal/statements/insert.go
+++ b/internal/statements/insert.go
@@ -17,7 +17,7 @@ func (statement *Statement) writeInsertOutput(buf *strings.Builder, table *schem
 		if _, err := buf.WriteString(" OUTPUT Inserted."); err != nil {
 			return err
 		}
-		if _, err := buf.WriteString(table.AutoIncrement); err != nil {
+		if err := statement.dialect.Quoter().QuoteTo(buf, table.AutoIncrement); err != nil {
 			return err
 		}
 	}
diff --git a/internal/statements/query.go b/internal/statements/query.go
index a972a8e0..69f48e73 100644
--- a/internal/statements/query.go
+++ b/internal/statements/query.go
@@ -314,7 +314,7 @@ func (statement *Statement) genSelectSQL(columnStr string, needLimit, needOrderB
 				fmt.Fprint(&buf, " LIMIT ", *pLimitN)
 			}
 		} else if dialect.URI().DBType == schemas.ORACLE {
-			if statement.Start != 0 || pLimitN != nil {
+			if statement.Start != 0 && pLimitN != nil {
 				oldString := buf.String()
 				buf.Reset()
 				rawColStr := columnStr
diff --git a/internal/statements/statement.go b/internal/statements/statement.go
index b1a5ed3c..0e245a96 100644
--- a/internal/statements/statement.go
+++ b/internal/statements/statement.go
@@ -8,6 +8,7 @@ import (
 	"database/sql/driver"
 	"errors"
 	"fmt"
+	"math/big"
 	"reflect"
 	"strings"
 	"time"
@@ -662,10 +663,6 @@ func (statement *Statement) GenIndexSQL() []string {
 	return sqls
 }
 
-func uniqueName(tableName, uqeName string) string {
-	return fmt.Sprintf("UQE_%v_%v", tableName, uqeName)
-}
-
 // GenUniqueSQL generates unique SQL
 func (statement *Statement) GenUniqueSQL() []string {
 	var sqls []string
@@ -693,6 +690,138 @@ func (statement *Statement) GenDelIndexSQL() []string {
 	return sqls
 }
 
+func (statement *Statement) asDBCond(fieldValue reflect.Value, fieldType reflect.Type, col *schemas.Column, allUseBool, requiredField bool) (interface{}, bool, error) {
+	switch fieldType.Kind() {
+	case reflect.Ptr:
+		if fieldValue.IsNil() {
+			return nil, true, nil
+		}
+		return statement.asDBCond(fieldValue.Elem(), fieldType.Elem(), col, allUseBool, requiredField)
+	case reflect.Bool:
+		if allUseBool || requiredField {
+			return fieldValue.Interface(), true, nil
+		}
+		// if a bool in a struct, it will not be as a condition because it default is false,
+		// please use Where() instead
+		return nil, false, nil
+	case reflect.String:
+		if !requiredField && fieldValue.String() == "" {
+			return nil, false, nil
+		}
+		// for MyString, should convert to string or panic
+		if fieldType.String() != reflect.String.String() {
+			return fieldValue.String(), true, nil
+		}
+		return fieldValue.Interface(), true, nil
+	case reflect.Int8, reflect.Int16, reflect.Int, reflect.Int32, reflect.Int64:
+		if !requiredField && fieldValue.Int() == 0 {
+			return nil, false, nil
+		}
+		return fieldValue.Interface(), true, nil
+	case reflect.Float32, reflect.Float64:
+		if !requiredField && fieldValue.Float() == 0.0 {
+			return nil, false, nil
+		}
+		return fieldValue.Interface(), true, nil
+	case reflect.Uint8, reflect.Uint16, reflect.Uint, reflect.Uint32, reflect.Uint64:
+		if !requiredField && fieldValue.Uint() == 0 {
+			return nil, false, nil
+		}
+		return fieldValue.Interface(), true, nil
+	case reflect.Struct:
+		if fieldType.ConvertibleTo(schemas.TimeType) {
+			t := fieldValue.Convert(schemas.TimeType).Interface().(time.Time)
+			if !requiredField && (t.IsZero() || !fieldValue.IsValid()) {
+				return nil, false, nil
+			}
+			return dialects.FormatColumnTime(statement.dialect, statement.defaultTimeZone, col, t), true, nil
+		} else if fieldType.ConvertibleTo(schemas.BigFloatType) {
+			t := fieldValue.Convert(schemas.BigFloatType).Interface().(big.Float)
+			v := t.String()
+			if v == "0" {
+				return nil, false, nil
+			}
+			return t.String(), true, nil
+		} else if _, ok := reflect.New(fieldType).Interface().(convert.Conversion); ok {
+			return nil, false, nil
+		} else if valNul, ok := fieldValue.Interface().(driver.Valuer); ok {
+			val, _ := valNul.Value()
+			if val == nil && !requiredField {
+				return nil, false, nil
+			}
+			return val, true, nil
+		} else {
+			if col.IsJSON {
+				if col.SQLType.IsText() {
+					bytes, err := json.DefaultJSONHandler.Marshal(fieldValue.Interface())
+					if err != nil {
+						return nil, false, err
+					}
+					return string(bytes), true, nil
+				} else if col.SQLType.IsBlob() {
+					var bytes []byte
+					var err error
+					bytes, err = json.DefaultJSONHandler.Marshal(fieldValue.Interface())
+					if err != nil {
+						return nil, false, err
+					}
+					return bytes, true, nil
+				}
+			} else {
+				table, err := statement.tagParser.ParseWithCache(fieldValue)
+				if err != nil {
+					return fieldValue.Interface(), true, nil
+				}
+
+				if len(table.PrimaryKeys) == 1 {
+					pkField := reflect.Indirect(fieldValue).FieldByName(table.PKColumns()[0].FieldName)
+					// fix non-int pk issues
+					//if pkField.Int() != 0 {
+					if pkField.IsValid() && !utils.IsZero(pkField.Interface()) {
+						return pkField.Interface(), true, nil
+					}
+					return nil, false, nil
+				}
+				return nil, false, fmt.Errorf("not supported %v as %v", fieldValue.Interface(), table.PrimaryKeys)
+			}
+		}
+	case reflect.Array:
+		return nil, false, nil
+	case reflect.Slice, reflect.Map:
+		if fieldValue == reflect.Zero(fieldType) {
+			return nil, false, nil
+		}
+		if fieldValue.IsNil() || !fieldValue.IsValid() || fieldValue.Len() == 0 {
+			return nil, false, nil
+		}
+
+		if col.SQLType.IsText() {
+			bytes, err := json.DefaultJSONHandler.Marshal(fieldValue.Interface())
+			if err != nil {
+				return nil, false, err
+			}
+			return string(bytes), true, nil
+		} else if col.SQLType.IsBlob() {
+			var bytes []byte
+			var err error
+			if (fieldType.Kind() == reflect.Array || fieldType.Kind() == reflect.Slice) &&
+				fieldType.Elem().Kind() == reflect.Uint8 {
+				if fieldValue.Len() > 0 {
+					return fieldValue.Bytes(), true, nil
+				}
+				return nil, false, nil
+			}
+			bytes, err = json.DefaultJSONHandler.Marshal(fieldValue.Interface())
+			if err != nil {
+				return nil, false, err
+			}
+			return bytes, true, nil
+		}
+		return nil, false, nil
+	}
+	return fieldValue.Interface(), true, nil
+}
+
 func (statement *Statement) buildConds2(table *schemas.Table, bean interface{},
 	includeVersion bool, includeUpdated bool, includeNil bool,
 	includeAutoIncr bool, allUseBool bool, useAllCols bool, unscoped bool,
@@ -747,9 +876,7 @@ func (statement *Statement) buildConds2(table *schemas.Table, bean interface{},
 			continue
 		}
 
-		fieldType := reflect.TypeOf(fieldValue.Interface())
 		requiredField := useAllCols
-
 		if b, ok := getFlagForColumn(mustColumnMap, col); ok {
 			if b {
 				requiredField = true
@@ -758,6 +885,7 @@ func (statement *Statement) buildConds2(table *schemas.Table, bean interface{},
 			}
 		}
 
+		fieldType := reflect.TypeOf(fieldValue.Interface())
 		if fieldType.Kind() == reflect.Ptr {
 			if fieldValue.IsNil() {
 				if includeNil {
@@ -774,131 +902,12 @@ func (statement *Statement) buildConds2(table *schemas.Table, bean interface{},
 			}
 		}
 
-		var val interface{}
-		switch fieldType.Kind() {
-		case reflect.Bool:
-			if allUseBool || requiredField {
-				val = fieldValue.Interface()
-			} else {
-				// if a bool in a struct, it will not be as a condition because it default is false,
-				// please use Where() instead
-				continue
-			}
-		case reflect.String:
-			if !requiredField && fieldValue.String() == "" {
-				continue
-			}
-			// for MyString, should convert to string or panic
-			if fieldType.String() != reflect.String.String() {
-				val = fieldValue.String()
-			} else {
-				val = fieldValue.Interface()
-			}
-		case reflect.Int8, reflect.Int16, reflect.Int, reflect.Int32, reflect.Int64:
-			if !requiredField && fieldValue.Int() == 0 {
-				continue
-			}
-			val = fieldValue.Interface()
-		case reflect.Float32, reflect.Float64:
-			if !requiredField && fieldValue.Float() == 0.0 {
-				continue
-			}
-			val = fieldValue.Interface()
-		case reflect.Uint8, reflect.Uint16, reflect.Uint, reflect.Uint32, reflect.Uint64:
-			if !requiredField && fieldValue.Uint() == 0 {
-				continue
-			}
-			val = fieldValue.Interface()
-		case reflect.Struct:
-			if fieldType.ConvertibleTo(schemas.TimeType) {
-				t := fieldValue.Convert(schemas.TimeType).Interface().(time.Time)
-				if !requiredField && (t.IsZero() || !fieldValue.IsValid()) {
-					continue
-				}
-				val = dialects.FormatColumnTime(statement.dialect, statement.defaultTimeZone, col, t)
-			} else if _, ok := reflect.New(fieldType).Interface().(convert.Conversion); ok {
-				continue
-			} else if valNul, ok := fieldValue.Interface().(driver.Valuer); ok {
-				val, _ = valNul.Value()
-				if val == nil && !requiredField {
-					continue
-				}
-			} else {
-				if col.IsJSON {
-					if col.SQLType.IsText() {
-						bytes, err := json.DefaultJSONHandler.Marshal(fieldValue.Interface())
-						if err != nil {
-							return nil, err
-						}
-						val = string(bytes)
-					} else if col.SQLType.IsBlob() {
-						var bytes []byte
-						var err error
-						bytes, err = json.DefaultJSONHandler.Marshal(fieldValue.Interface())
-						if err != nil {
-							return nil, err
-						}
-						val = bytes
-					}
-				} else {
-					table, err := statement.tagParser.ParseWithCache(fieldValue)
-					if err != nil {
-						val = fieldValue.Interface()
-					} else {
-						if len(table.PrimaryKeys) == 1 {
-							pkField := reflect.Indirect(fieldValue).FieldByName(table.PKColumns()[0].FieldName)
-							// fix non-int pk issues
-							//if pkField.Int() != 0 {
-							if pkField.IsValid() && !utils.IsZero(pkField.Interface()) {
-								val = pkField.Interface()
-							} else {
-								continue
-							}
-						} else {
-							//TODO: how to handler?
-							return nil, fmt.Errorf("not supported %v as %v", fieldValue.Interface(), table.PrimaryKeys)
-						}
-					}
-				}
-			}
-		case reflect.Array:
+		val, ok, err := statement.asDBCond(fieldValue, fieldType, col, allUseBool, requiredField)
+		if err != nil {
+			return nil, err
+		}
+		if !ok {
 			continue
-		case reflect.Slice, reflect.Map:
-			if fieldValue == reflect.Zero(fieldType) {
-				continue
-			}
-			if fieldValue.IsNil() || !fieldValue.IsValid() || fieldValue.Len() == 0 {
-				continue
-			}
-
-			if col.SQLType.IsText() {
-				bytes, err := json.DefaultJSONHandler.Marshal(fieldValue.Interface())
-				if err != nil {
-					return nil, err
-				}
-				val = string(bytes)
-			} else if col.SQLType.IsBlob() {
-				var bytes []byte
-				var err error
-				if (fieldType.Kind() == reflect.Array || fieldType.Kind() == reflect.Slice) &&
-					fieldType.Elem().Kind() == reflect.Uint8 {
-					if fieldValue.Len() > 0 {
-						val = fieldValue.Bytes()
-					} else {
-						continue
-					}
-				} else {
-					bytes, err = json.DefaultJSONHandler.Marshal(fieldValue.Interface())
-					if err != nil {
-						return nil, err
-					}
-					val = bytes
-				}
-			} else {
-				continue
-			}
-		default:
-			val = fieldValue.Interface()
 		}
 
 		conds = append(conds, builder.Eq{colName: val})
@@ -942,16 +951,29 @@ func (statement *Statement) quoteColumnStr(columnStr string) string {
 
 // ConvertSQLOrArgs converts sql or args
 func (statement *Statement) ConvertSQLOrArgs(sqlOrArgs ...interface{}) (string, []interface{}, error) {
-	sql, args, err := convertSQLOrArgs(sqlOrArgs...)
+	sql, args, err := statement.convertSQLOrArgs(sqlOrArgs...)
 	if err != nil {
 		return "", nil, err
 	}
 	return statement.ReplaceQuote(sql), args, nil
 }
 
-func convertSQLOrArgs(sqlOrArgs ...interface{}) (string, []interface{}, error) {
+func (statement *Statement) convertSQLOrArgs(sqlOrArgs ...interface{}) (string, []interface{}, error) {
 	switch sqlOrArgs[0].(type) {
 	case string:
+		if len(sqlOrArgs) > 1 {
+			var newArgs = make([]interface{}, 0, len(sqlOrArgs)-1)
+			for _, arg := range sqlOrArgs[1:] {
+				if v, ok := arg.(*time.Time); ok {
+					newArgs = append(newArgs, v.In(statement.defaultTimeZone).Format("2006-01-02 15:04:05"))
+				} else if v, ok := arg.(time.Time); ok {
+					newArgs = append(newArgs, v.In(statement.defaultTimeZone).Format("2006-01-02 15:04:05"))
+				} else {
+					newArgs = append(newArgs, arg)
+				}
+			}
+			return sqlOrArgs[0].(string), newArgs, nil
+		}
 		return sqlOrArgs[0].(string), sqlOrArgs[1:], nil
 	case *builder.Builder:
 		return sqlOrArgs[0].(*builder.Builder).ToSQL()
@@ -978,7 +1000,7 @@ func (statement *Statement) joinColumns(cols []*schemas.Column, includeTableName
 
 // CondDeleted returns the conditions whether a record is soft deleted.
 func (statement *Statement) CondDeleted(col *schemas.Column) builder.Cond {
-	var colName = col.Name
+	var colName = statement.quote(col.Name)
 	if statement.JoinStr != "" {
 		var prefix string
 		if statement.TableAlias != "" {
diff --git a/internal/statements/update.go b/internal/statements/update.go
index 06cf0689..3020595b 100644
--- a/internal/statements/update.go
+++ b/internal/statements/update.go
@@ -127,8 +127,9 @@ func (statement *Statement) BuildUpdates(tableValue reflect.Value,
 				if err != nil {
 					return nil, nil, err
 				}
-
-				val = data
+				if data != nil {
+					val = data
+				}
 				goto APPEND
 			}
 		}
@@ -138,8 +139,9 @@ func (statement *Statement) BuildUpdates(tableValue reflect.Value,
 			if err != nil {
 				return nil, nil, err
 			}
-
-			val = data
+			if data != nil {
+				val = data
+			}
 			goto APPEND
 		}
 
diff --git a/internal/statements/values.go b/internal/statements/values.go
index 71327c55..c572ead5 100644
--- a/internal/statements/values.go
+++ b/internal/statements/values.go
@@ -8,6 +8,7 @@ import (
 	"database/sql"
 	"database/sql/driver"
 	"fmt"
+	"math/big"
 	"reflect"
 	"time"
 
@@ -19,9 +20,10 @@ import (
 
 var (
 	nullFloatType = reflect.TypeOf(sql.NullFloat64{})
+	bigFloatType  = reflect.TypeOf(big.Float{})
 )
 
-// Value2Interface convert a field value of a struct to interface for puting into database
+// Value2Interface convert a field value of a struct to interface for putting into database
 func (statement *Statement) Value2Interface(col *schemas.Column, fieldValue reflect.Value) (interface{}, error) {
 	if fieldValue.CanAddr() {
 		if fieldConvert, ok := fieldValue.Addr().Interface().(convert.Conversion); ok {
@@ -29,6 +31,12 @@ func (statement *Statement) Value2Interface(col *schemas.Column, fieldValue refl
 			if err != nil {
 				return nil, err
 			}
+			if data == nil {
+				if col.Nullable {
+					return nil, nil
+				}
+				data = []byte{}
+			}
 			if col.SQLType.IsBlob() {
 				return data, nil
 			}
@@ -43,12 +51,15 @@ func (statement *Statement) Value2Interface(col *schemas.Column, fieldValue refl
 			if err != nil {
 				return nil, err
 			}
+			if data == nil {
+				if col.Nullable {
+					return nil, nil
+				}
+				data = []byte{}
+			}
 			if col.SQLType.IsBlob() {
 				return data, nil
 			}
-			if nil == data {
-				return nil, nil
-			}
 			return string(data), nil
 		}
 	}
@@ -84,6 +95,9 @@ func (statement *Statement) Value2Interface(col *schemas.Column, fieldValue refl
 				return nil, nil
 			}
 			return t.Float64, nil
+		} else if fieldType.ConvertibleTo(bigFloatType) {
+			t := fieldValue.Convert(bigFloatType).Interface().(big.Float)
+			return t.String(), nil
 		}
 
 		if !col.IsJSON {
diff --git a/internal/utils/strings.go b/internal/utils/strings.go
index 86469c0f..159e2876 100644
--- a/internal/utils/strings.go
+++ b/internal/utils/strings.go
@@ -13,7 +13,7 @@ func IndexNoCase(s, sep string) int {
 	return strings.Index(strings.ToLower(s), strings.ToLower(sep))
 }
 
-// SplitNoCase split a string by a seperator with no care of capitalize
+// SplitNoCase split a string by a separator with no care of capitalize
 func SplitNoCase(s, sep string) []string {
 	idx := IndexNoCase(s, sep)
 	if idx < 0 {
@@ -22,7 +22,7 @@ func SplitNoCase(s, sep string) []string {
 	return strings.Split(s, s[idx:idx+len(sep)])
 }
 
-// SplitNNoCase split n by a seperator with no care of capitalize
+// SplitNNoCase split n by a separator with no care of capitalize
 func SplitNNoCase(s, sep string, n int) []string {
 	idx := IndexNoCase(s, sep)
 	if idx < 0 {
diff --git a/names/mapper.go b/names/mapper.go
index b0ce8076..69f67171 100644
--- a/names/mapper.go
+++ b/names/mapper.go
@@ -79,7 +79,7 @@ func (m SameMapper) Table2Obj(t string) string {
 	return t
 }
 
-// SnakeMapper implements IMapper and provides name transaltion between
+// SnakeMapper implements IMapper and provides name translation between
 // struct and database table
 type SnakeMapper struct {
 }
diff --git a/rows.go b/rows.go
index a56ea1c9..8e7cc075 100644
--- a/rows.go
+++ b/rows.go
@@ -5,7 +5,6 @@
 package xorm
 
 import (
-	"database/sql"
 	"errors"
 	"fmt"
 	"reflect"
@@ -17,10 +16,9 @@ import (
 
 // Rows rows wrapper a rows to
 type Rows struct {
-	session   *Session
-	rows      *core.Rows
-	beanType  reflect.Type
-	lastError error
+	session  *Session
+	rows     *core.Rows
+	beanType reflect.Type
 }
 
 func newRows(session *Session, bean interface{}) (*Rows, error) {
@@ -62,15 +60,6 @@ func newRows(session *Session, bean interface{}) (*Rows, error) {
 			// !oinume! Add "<col> IS NULL" to WHERE whatever condiBean is given.
 			// See https://gitea.com/xorm/xorm/issues/179
 			if col := table.DeletedColumn(); col != nil && !session.statement.GetUnscoped() { // tag "deleted" is enabled
-				var colName = session.engine.Quote(col.Name)
-				if addedTableName {
-					var nm = session.statement.TableName()
-					if len(session.statement.TableAlias) > 0 {
-						nm = session.statement.TableAlias
-					}
-					colName = session.engine.Quote(nm) + "." + colName
-				}
-
 				autoCond = session.statement.CondDeleted(col)
 			}
 		}
@@ -86,7 +75,6 @@ func newRows(session *Session, bean interface{}) (*Rows, error) {
 
 	rows.rows, err = rows.session.queryRows(sqlStr, args...)
 	if err != nil {
-		rows.lastError = err
 		rows.Close()
 		return nil, err
 	}
@@ -96,25 +84,18 @@ func newRows(session *Session, bean interface{}) (*Rows, error) {
 
 // Next move cursor to next record, return false if end has reached
 func (rows *Rows) Next() bool {
-	if rows.lastError == nil && rows.rows != nil {
-		hasNext := rows.rows.Next()
-		if !hasNext {
-			rows.lastError = sql.ErrNoRows
-		}
-		return hasNext
-	}
-	return false
+	return rows.rows.Next()
 }
 
 // Err returns the error, if any, that was encountered during iteration. Err may be called after an explicit or implicit Close.
 func (rows *Rows) Err() error {
-	return rows.lastError
+	return rows.rows.Err()
 }
 
 // Scan row record to bean properties
 func (rows *Rows) Scan(bean interface{}) error {
-	if rows.lastError != nil {
-		return rows.lastError
+	if rows.Err() != nil {
+		return rows.Err()
 	}
 
 	if reflect.Indirect(reflect.ValueOf(bean)).Type() != rows.beanType {
@@ -129,8 +110,12 @@ func (rows *Rows) Scan(bean interface{}) error {
 	if err != nil {
 		return err
 	}
+	types, err := rows.rows.ColumnTypes()
+	if err != nil {
+		return err
+	}
 
-	scanResults, err := rows.session.row2Slice(rows.rows, fields, bean)
+	scanResults, err := rows.session.row2Slice(rows.rows, fields, types, bean)
 	if err != nil {
 		return err
 	}
@@ -154,5 +139,5 @@ func (rows *Rows) Close() error {
 		return rows.rows.Close()
 	}
 
-	return rows.lastError
+	return rows.Err()
 }
diff --git a/scan.go b/scan.go
new file mode 100644
index 00000000..ccd6938d
--- /dev/null
+++ b/scan.go
@@ -0,0 +1,320 @@
+// Copyright 2021 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package xorm
+
+import (
+	"database/sql"
+	"fmt"
+	"math/big"
+	"reflect"
+	"time"
+
+	"xorm.io/xorm/convert"
+	"xorm.io/xorm/core"
+	"xorm.io/xorm/dialects"
+	"xorm.io/xorm/schemas"
+)
+
+// genScanResultsByBeanNullabale generates scan result
+func genScanResultsByBeanNullable(bean interface{}) (interface{}, bool, error) {
+	switch t := bean.(type) {
+	case *interface{}:
+		return t, false, nil
+	case *sql.NullInt64, *sql.NullBool, *sql.NullFloat64, *sql.NullString, *sql.RawBytes:
+		return t, false, nil
+	case *time.Time:
+		return &sql.NullString{}, true, nil
+	case *sql.NullTime:
+		return &sql.NullString{}, true, nil
+	case *string:
+		return &sql.NullString{}, true, nil
+	case *int, *int8, *int16, *int32:
+		return &sql.NullInt32{}, true, nil
+	case *int64:
+		return &sql.NullInt64{}, true, nil
+	case *uint, *uint8, *uint16, *uint32:
+		return &NullUint32{}, true, nil
+	case *uint64:
+		return &NullUint64{}, true, nil
+	case *float32, *float64:
+		return &sql.NullFloat64{}, true, nil
+	case *bool:
+		return &sql.NullBool{}, true, nil
+	case sql.NullInt64, sql.NullBool, sql.NullFloat64, sql.NullString,
+		time.Time,
+		string,
+		int, int8, int16, int32, int64,
+		uint, uint8, uint16, uint32, uint64,
+		float32, float64,
+		bool:
+		return nil, false, fmt.Errorf("unsupported scan type: %t", t)
+	case convert.Conversion:
+		return &sql.RawBytes{}, true, nil
+	}
+
+	tp := reflect.TypeOf(bean).Elem()
+	switch tp.Kind() {
+	case reflect.String:
+		return &sql.NullString{}, true, nil
+	case reflect.Int64:
+		return &sql.NullInt64{}, true, nil
+	case reflect.Int32, reflect.Int, reflect.Int16, reflect.Int8:
+		return &sql.NullInt32{}, true, nil
+	case reflect.Uint64:
+		return &NullUint64{}, true, nil
+	case reflect.Uint32, reflect.Uint, reflect.Uint16, reflect.Uint8:
+		return &NullUint32{}, true, nil
+	default:
+		return nil, false, fmt.Errorf("unsupported type: %#v", bean)
+	}
+}
+
+func genScanResultsByBean(bean interface{}) (interface{}, bool, error) {
+	switch t := bean.(type) {
+	case *interface{}:
+		return t, false, nil
+	case *sql.NullInt64, *sql.NullBool, *sql.NullFloat64, *sql.NullString,
+		*sql.RawBytes,
+		*string,
+		*int, *int8, *int16, *int32, *int64,
+		*uint, *uint8, *uint16, *uint32, *uint64,
+		*float32, *float64,
+		*bool:
+		return t, false, nil
+	case *time.Time, *sql.NullTime:
+		return &sql.NullString{}, true, nil
+	case sql.NullInt64, sql.NullBool, sql.NullFloat64, sql.NullString,
+		time.Time,
+		string,
+		int, int8, int16, int32, int64,
+		uint, uint8, uint16, uint32, uint64,
+		bool:
+		return nil, false, fmt.Errorf("unsupported scan type: %t", t)
+	case convert.Conversion:
+		return &sql.RawBytes{}, true, nil
+	}
+
+	tp := reflect.TypeOf(bean).Elem()
+	switch tp.Kind() {
+	case reflect.String:
+		return new(string), true, nil
+	case reflect.Int64:
+		return new(int64), true, nil
+	case reflect.Int32:
+		return new(int32), true, nil
+	case reflect.Int:
+		return new(int32), true, nil
+	case reflect.Int16:
+		return new(int32), true, nil
+	case reflect.Int8:
+		return new(int32), true, nil
+	case reflect.Uint64:
+		return new(uint64), true, nil
+	case reflect.Uint32:
+		return new(uint32), true, nil
+	case reflect.Uint:
+		return new(uint), true, nil
+	case reflect.Uint16:
+		return new(uint16), true, nil
+	case reflect.Uint8:
+		return new(uint8), true, nil
+	case reflect.Float32:
+		return new(float32), true, nil
+	case reflect.Float64:
+		return new(float64), true, nil
+	default:
+		return nil, false, fmt.Errorf("unsupported type: %#v", bean)
+	}
+}
+
+func (engine *Engine) row2mapStr(rows *core.Rows, types []*sql.ColumnType, fields []string) (map[string]string, error) {
+	var scanResults = make([]interface{}, len(fields))
+	for i := 0; i < len(fields); i++ {
+		var s sql.NullString
+		scanResults[i] = &s
+	}
+
+	if err := rows.Scan(scanResults...); err != nil {
+		return nil, err
+	}
+
+	result := make(map[string]string, len(fields))
+	for i, key := range fields {
+		s := scanResults[i].(*sql.NullString)
+		if s.String == "" {
+			result[key] = ""
+			continue
+		}
+
+		if schemas.TIME_TYPE == engine.dialect.ColumnTypeKind(types[i].DatabaseTypeName()) {
+			t, err := convert.String2Time(s.String, engine.DatabaseTZ, engine.TZLocation)
+			if err != nil {
+				return nil, err
+			}
+			result[key] = t.Format("2006-01-02 15:04:05")
+		} else {
+			result[key] = s.String
+		}
+	}
+	return result, nil
+}
+
+func row2mapBytes(rows *core.Rows, types []*sql.ColumnType, fields []string) (map[string][]byte, error) {
+	var scanResults = make([]interface{}, len(fields))
+	for i := 0; i < len(fields); i++ {
+		var s sql.NullString
+		scanResults[i] = &s
+	}
+
+	if err := rows.Scan(scanResults...); err != nil {
+		return nil, err
+	}
+
+	result := make(map[string][]byte, len(fields))
+	for ii, key := range fields {
+		s := scanResults[ii].(*sql.NullString)
+		result[key] = []byte(s.String)
+	}
+	return result, nil
+}
+
+func (engine *Engine) scanStringInterface(rows *core.Rows, fields []string, types []*sql.ColumnType) ([]interface{}, error) {
+	var scanResults = make([]interface{}, len(types))
+	for i := 0; i < len(types); i++ {
+		var s sql.NullString
+		scanResults[i] = &s
+	}
+
+	if err := engine.scan(rows, fields, types, scanResults...); err != nil {
+		return nil, err
+	}
+	return scanResults, nil
+}
+
+// scan is a wrap of driver.Scan but will automatically change the input values according requirements
+func (engine *Engine) scan(rows *core.Rows, fields []string, types []*sql.ColumnType, vv ...interface{}) error {
+	var scanResults = make([]interface{}, 0, len(types))
+	var replaces = make([]bool, 0, len(types))
+	var err error
+	for _, v := range vv {
+		var replaced bool
+		var scanResult interface{}
+		switch t := v.(type) {
+		case *big.Float, *time.Time, *sql.NullTime:
+			scanResult = &sql.NullString{}
+			replaced = true
+		case sql.Scanner:
+			scanResult = t
+		case convert.Conversion:
+			scanResult = &sql.RawBytes{}
+			replaced = true
+		default:
+			nullable, ok := types[0].Nullable()
+			if !ok || nullable {
+				scanResult, replaced, err = genScanResultsByBeanNullable(v)
+			} else {
+				scanResult, replaced, err = genScanResultsByBean(v)
+			}
+			if err != nil {
+				return err
+			}
+		}
+
+		scanResults = append(scanResults, scanResult)
+		replaces = append(replaces, replaced)
+	}
+
+	if err = engine.driver.Scan(&dialects.ScanContext{
+		DBLocation:   engine.DatabaseTZ,
+		UserLocation: engine.TZLocation,
+	}, rows, types, scanResults...); err != nil {
+		return err
+	}
+
+	for i, replaced := range replaces {
+		if replaced {
+			if err = convertAssign(vv[i], scanResults[i], engine.DatabaseTZ, engine.TZLocation); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func (engine *Engine) scanInterfaces(rows *core.Rows, fields []string, types []*sql.ColumnType) ([]interface{}, error) {
+	var scanResultContainers = make([]interface{}, len(types))
+	for i := 0; i < len(types); i++ {
+		scanResult, err := engine.driver.GenScanResult(types[i].DatabaseTypeName())
+		if err != nil {
+			return nil, err
+		}
+		scanResultContainers[i] = scanResult
+	}
+	if err := engine.scan(rows, fields, types, scanResultContainers...); err != nil {
+		return nil, err
+	}
+	return scanResultContainers, nil
+}
+
+func (engine *Engine) row2sliceStr(rows *core.Rows, types []*sql.ColumnType, fields []string) ([]string, error) {
+	scanResults, err := engine.scanStringInterface(rows, fields, types)
+	if err != nil {
+		return nil, err
+	}
+
+	var results = make([]string, 0, len(fields))
+	for i := 0; i < len(fields); i++ {
+		results = append(results, scanResults[i].(*sql.NullString).String)
+	}
+	return results, nil
+}
+
+func rows2maps(rows *core.Rows) (resultsSlice []map[string][]byte, err error) {
+	fields, err := rows.Columns()
+	if err != nil {
+		return nil, err
+	}
+	types, err := rows.ColumnTypes()
+	if err != nil {
+		return nil, err
+	}
+	for rows.Next() {
+		result, err := row2mapBytes(rows, types, fields)
+		if err != nil {
+			return nil, err
+		}
+		resultsSlice = append(resultsSlice, result)
+	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
+
+	return resultsSlice, nil
+}
+
+func (engine *Engine) row2mapInterface(rows *core.Rows, types []*sql.ColumnType, fields []string) (map[string]interface{}, error) {
+	var resultsMap = make(map[string]interface{}, len(fields))
+	var scanResultContainers = make([]interface{}, len(fields))
+	for i := 0; i < len(fields); i++ {
+		scanResult, err := engine.driver.GenScanResult(types[i].DatabaseTypeName())
+		if err != nil {
+			return nil, err
+		}
+		scanResultContainers[i] = scanResult
+	}
+	if err := engine.scan(rows, fields, types, scanResultContainers...); err != nil {
+		return nil, err
+	}
+
+	for ii, key := range fields {
+		res, err := convert.Interface2Interface(engine.TZLocation, scanResultContainers[ii])
+		if err != nil {
+			return nil, err
+		}
+		resultsMap[key] = res
+	}
+	return resultsMap, nil
+}
diff --git a/schemas/table_test.go b/schemas/table_test.go
index 0e35193f..f352675b 100644
--- a/schemas/table_test.go
+++ b/schemas/table_test.go
@@ -58,7 +58,6 @@ func TestGetColumnIdx(t *testing.T) {
 func BenchmarkGetColumnWithToLower(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		for _, test := range testsGetColumn {
-
 			if _, ok := table.columnsMap[strings.ToLower(test.name)]; !ok {
 				b.Errorf("Column not found:%s", test.name)
 			}
@@ -69,7 +68,6 @@ func BenchmarkGetColumnWithToLower(b *testing.B) {
 func BenchmarkGetColumnIdxWithToLower(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		for _, test := range testsGetColumn {
-
 			if c, ok := table.columnsMap[strings.ToLower(test.name)]; ok {
 				if test.idx < len(c) {
 					continue
diff --git a/schemas/type.go b/schemas/type.go
index fc02f015..d64251bf 100644
--- a/schemas/type.go
+++ b/schemas/type.go
@@ -5,6 +5,7 @@
 package schemas
 
 import (
+	"math/big"
 	"reflect"
 	"sort"
 	"strings"
@@ -38,6 +39,7 @@ const (
 	TIME_TYPE
 	NUMERIC_TYPE
 	ARRAY_TYPE
+	BOOL_TYPE
 )
 
 // IsType reutrns ture if the column type is the same as the parameter
@@ -63,6 +65,11 @@ func (s *SQLType) IsTime() bool {
 	return s.IsType(TIME_TYPE)
 }
 
+// IsBool returns true if column is a boolean type
+func (s *SQLType) IsBool() bool {
+	return s.IsType(BOOL_TYPE)
+}
+
 // IsNumeric returns true if column is a numeric type
 func (s *SQLType) IsNumeric() bool {
 	return s.IsType(NUMERIC_TYPE)
@@ -208,7 +215,8 @@ var (
 		Bytea:            BLOB_TYPE,
 		UniqueIdentifier: BLOB_TYPE,
 
-		Bool: NUMERIC_TYPE,
+		Bool:    BOOL_TYPE,
+		Boolean: BOOL_TYPE,
 
 		Serial:    NUMERIC_TYPE,
 		BigSerial: NUMERIC_TYPE,
@@ -240,6 +248,7 @@ var (
 	intDefault        int
 	uintDefault       uint
 	timeDefault       time.Time
+	bigFloatDefault   big.Float
 )
 
 // enumerates all types
@@ -267,7 +276,8 @@ var (
 	ByteType   = reflect.TypeOf(byteDefault)
 	BytesType  = reflect.SliceOf(ByteType)
 
-	TimeType = reflect.TypeOf(timeDefault)
+	TimeType     = reflect.TypeOf(timeDefault)
+	BigFloatType = reflect.TypeOf(bigFloatDefault)
 )
 
 // enumerates all types
@@ -365,3 +375,9 @@ func SQLType2Type(st SQLType) reflect.Type {
 		return reflect.TypeOf("")
 	}
 }
+
+// SQLTypeName returns sql type name
+func SQLTypeName(tp string) string {
+	fields := strings.Split(tp, "(")
+	return fields[0]
+}
diff --git a/session.go b/session.go
index 6df9e20d..62d6a770 100644
--- a/session.go
+++ b/session.go
@@ -16,7 +16,6 @@ import (
 	"io"
 	"reflect"
 	"strings"
-	"time"
 
 	"xorm.io/xorm/contexts"
 	"xorm.io/xorm/convert"
@@ -365,31 +364,30 @@ func (session *Session) doPrepare(db *core.DB, sqlStr string) (stmt *core.Stmt,
 	return
 }
 
-func (session *Session) getField(dataStruct *reflect.Value, key string, table *schemas.Table, idx int) (*reflect.Value, error) {
-	var col *schemas.Column
-	if col = table.GetColumnIdx(key, idx); col == nil {
-		return nil, ErrFieldIsNotExist{key, table.Name}
+func (session *Session) getField(dataStruct *reflect.Value, table *schemas.Table, colName string, idx int) (*schemas.Column, *reflect.Value, error) {
+	var col = table.GetColumnIdx(colName, idx)
+	if col == nil {
+		return nil, nil, ErrFieldIsNotExist{colName, table.Name}
 	}
 
 	fieldValue, err := col.ValueOfV(dataStruct)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	if fieldValue == nil {
-		return nil, ErrFieldIsNotValid{key, table.Name}
+		return nil, nil, ErrFieldIsNotValid{colName, table.Name}
 	}
-
 	if !fieldValue.IsValid() || !fieldValue.CanSet() {
-		return nil, ErrFieldIsNotValid{key, table.Name}
+		return nil, nil, ErrFieldIsNotValid{colName, table.Name}
 	}
 
-	return fieldValue, nil
+	return col, fieldValue, nil
 }
 
 // Cell cell is a result of one column field
 type Cell *interface{}
 
-func (session *Session) rows2Beans(rows *core.Rows, fields []string,
+func (session *Session) rows2Beans(rows *core.Rows, fields []string, types []*sql.ColumnType,
 	table *schemas.Table, newElemFunc func([]string) reflect.Value,
 	sliceValueSetFunc func(*reflect.Value, schemas.PK) error) error {
 	for rows.Next() {
@@ -398,7 +396,7 @@ func (session *Session) rows2Beans(rows *core.Rows, fields []string,
 		dataStruct := newValue.Elem()
 
 		// handle beforeClosures
-		scanResults, err := session.row2Slice(rows, fields, bean)
+		scanResults, err := session.row2Slice(rows, fields, types, bean)
 		if err != nil {
 			return err
 		}
@@ -414,10 +412,10 @@ func (session *Session) rows2Beans(rows *core.Rows, fields []string,
 			bean:    bean,
 		})
 	}
-	return nil
+	return rows.Err()
 }
 
-func (session *Session) row2Slice(rows *core.Rows, fields []string, bean interface{}) ([]interface{}, error) {
+func (session *Session) row2Slice(rows *core.Rows, fields []string, types []*sql.ColumnType, bean interface{}) ([]interface{}, error) {
 	for _, closure := range session.beforeClosures {
 		closure(bean)
 	}
@@ -427,7 +425,7 @@ func (session *Session) row2Slice(rows *core.Rows, fields []string, bean interfa
 		var cell interface{}
 		scanResults[i] = &cell
 	}
-	if err := rows.Scan(scanResults...); err != nil {
+	if err := session.engine.scan(rows, fields, types, scanResults...); err != nil {
 		return nil, err
 	}
 
@@ -436,6 +434,187 @@ func (session *Session) row2Slice(rows *core.Rows, fields []string, bean interfa
 	return scanResults, nil
 }
 
+func (session *Session) setJSON(fieldValue *reflect.Value, fieldType reflect.Type, scanResult interface{}) error {
+	bs, ok := asBytes(scanResult)
+	if !ok {
+		return fmt.Errorf("unsupported database data type: %#v", scanResult)
+	}
+	if len(bs) == 0 {
+		return nil
+	}
+
+	if fieldType.Kind() == reflect.String {
+		fieldValue.SetString(string(bs))
+		return nil
+	}
+
+	if fieldValue.CanAddr() {
+		err := json.DefaultJSONHandler.Unmarshal(bs, fieldValue.Addr().Interface())
+		if err != nil {
+			return err
+		}
+	} else {
+		x := reflect.New(fieldType)
+		err := json.DefaultJSONHandler.Unmarshal(bs, x.Interface())
+		if err != nil {
+			return err
+		}
+		fieldValue.Set(x.Elem())
+	}
+	return nil
+}
+
+func (session *Session) convertBeanField(col *schemas.Column, fieldValue *reflect.Value,
+	scanResult interface{}, table *schemas.Table) error {
+	v, ok := scanResult.(*interface{})
+	if ok {
+		scanResult = *v
+	}
+	if scanResult == nil {
+		return nil
+	}
+
+	if fieldValue.CanAddr() {
+		if structConvert, ok := fieldValue.Addr().Interface().(convert.Conversion); ok {
+			data, ok := asBytes(scanResult)
+			if !ok {
+				return fmt.Errorf("cannot convert %#v as bytes", scanResult)
+			}
+			return structConvert.FromDB(data)
+		}
+	}
+
+	if structConvert, ok := fieldValue.Interface().(convert.Conversion); ok {
+		data, ok := asBytes(scanResult)
+		if !ok {
+			return fmt.Errorf("cannot convert %#v as bytes", scanResult)
+		}
+		if data == nil {
+			return nil
+		}
+
+		if fieldValue.Kind() == reflect.Ptr && fieldValue.IsNil() {
+			fieldValue.Set(reflect.New(fieldValue.Type().Elem()))
+			return fieldValue.Interface().(convert.Conversion).FromDB(data)
+		}
+		return structConvert.FromDB(data)
+	}
+
+	vv := reflect.ValueOf(scanResult)
+	fieldType := fieldValue.Type()
+
+	if col.IsJSON {
+		return session.setJSON(fieldValue, fieldType, scanResult)
+	}
+
+	switch fieldType.Kind() {
+	case reflect.Ptr:
+		var e reflect.Value
+		if fieldValue.IsNil() {
+			e = reflect.New(fieldType.Elem()).Elem()
+		} else {
+			e = fieldValue.Elem()
+		}
+		if err := session.convertBeanField(col, &e, scanResult, table); err != nil {
+			return err
+		}
+		if fieldValue.IsNil() {
+			fieldValue.Set(e.Addr())
+		}
+		return nil
+	case reflect.Complex64, reflect.Complex128:
+		return session.setJSON(fieldValue, fieldType, scanResult)
+	case reflect.Slice, reflect.Array:
+		bs, ok := asBytes(scanResult)
+		if ok && fieldType.Elem().Kind() == reflect.Uint8 {
+			if col.SQLType.IsText() {
+				x := reflect.New(fieldType)
+				err := json.DefaultJSONHandler.Unmarshal(bs, x.Interface())
+				if err != nil {
+					return err
+				}
+				fieldValue.Set(x.Elem())
+			} else {
+				if fieldValue.Len() > 0 {
+					for i := 0; i < fieldValue.Len(); i++ {
+						if i < vv.Len() {
+							fieldValue.Index(i).Set(vv.Index(i))
+						}
+					}
+				} else {
+					for i := 0; i < vv.Len(); i++ {
+						fieldValue.Set(reflect.Append(*fieldValue, vv.Index(i)))
+					}
+				}
+			}
+			return nil
+		}
+	case reflect.Struct:
+		if fieldType.ConvertibleTo(schemas.BigFloatType) {
+			v, err := asBigFloat(scanResult)
+			if err != nil {
+				return err
+			}
+			fieldValue.Set(reflect.ValueOf(v).Elem().Convert(fieldType))
+			return nil
+		}
+
+		if fieldType.ConvertibleTo(schemas.TimeType) {
+			dbTZ := session.engine.DatabaseTZ
+			if col.TimeZone != nil {
+				dbTZ = col.TimeZone
+			}
+
+			t, err := asTime(scanResult, dbTZ, session.engine.TZLocation)
+			if err != nil {
+				return err
+			}
+
+			fieldValue.Set(reflect.ValueOf(*t).Convert(fieldType))
+			return nil
+		} else if nulVal, ok := fieldValue.Addr().Interface().(sql.Scanner); ok {
+			err := nulVal.Scan(scanResult)
+			if err == nil {
+				return nil
+			}
+			session.engine.logger.Errorf("sql.Sanner error: %v", err)
+		} else if session.statement.UseCascade {
+			table, err := session.engine.tagParser.ParseWithCache(*fieldValue)
+			if err != nil {
+				return err
+			}
+
+			if len(table.PrimaryKeys) != 1 {
+				return errors.New("unsupported non or composited primary key cascade")
+			}
+			var pk = make(schemas.PK, len(table.PrimaryKeys))
+			pk[0], err = asKind(vv, reflect.TypeOf(scanResult))
+			if err != nil {
+				return err
+			}
+
+			if !pk.IsZero() {
+				// !nashtsai! TODO for hasOne relationship, it's preferred to use join query for eager fetch
+				// however, also need to consider adding a 'lazy' attribute to xorm tag which allow hasOne
+				// property to be fetched lazily
+				structInter := reflect.New(fieldValue.Type())
+				has, err := session.ID(pk).NoCascade().get(structInter.Interface())
+				if err != nil {
+					return err
+				}
+				if has {
+					fieldValue.Set(structInter.Elem())
+				} else {
+					return errors.New("cascade obj is not exist")
+				}
+			}
+			return nil
+		}
+	} // switch fieldType.Kind()
+
+	return convertAssignV(fieldValue.Addr(), scanResult)
+}
+
 func (session *Session) slice2Bean(scanResults []interface{}, fields []string, bean interface{}, dataStruct *reflect.Value, table *schemas.Table) (schemas.PK, error) {
 	defer func() {
 		executeAfterSet(bean, fields, scanResults)
@@ -445,10 +624,11 @@ func (session *Session) slice2Bean(scanResults []interface{}, fields []string, b
 
 	var tempMap = make(map[string]int)
 	var pk schemas.PK
-	for ii, key := range fields {
+	for i, colName := range fields {
 		var idx int
+		var lKey = strings.ToLower(colName)
 		var ok bool
-		var lKey = strings.ToLower(key)
+
 		if idx, ok = tempMap[lKey]; !ok {
 			idx = 0
 		} else {
@@ -456,9 +636,9 @@ func (session *Session) slice2Bean(scanResults []interface{}, fields []string, b
 		}
 		tempMap[lKey] = idx
 
-		fieldValue, err := session.getField(dataStruct, key, table, idx)
+		col, fieldValue, err := session.getField(dataStruct, table, colName, idx)
 		if err != nil {
-			if !strings.Contains(err.Error(), "is not valid") {
+			if _, ok := err.(ErrFieldIsNotValid); !ok {
 				session.engine.logger.Warnf("%v", err)
 			}
 			continue
@@ -466,408 +646,12 @@ func (session *Session) slice2Bean(scanResults []interface{}, fields []string, b
 		if fieldValue == nil {
 			continue
 		}
-		rawValue := reflect.Indirect(reflect.ValueOf(scanResults[ii]))
 
-		// if row is null then ignore
-		if rawValue.Interface() == nil {
-			continue
+		if err := session.convertBeanField(col, fieldValue, scanResults[i], table); err != nil {
+			return nil, err
 		}
-
-		if fieldValue.CanAddr() {
-			if structConvert, ok := fieldValue.Addr().Interface().(convert.Conversion); ok {
-				if data, err := value2Bytes(&rawValue); err == nil {
-					if err := structConvert.FromDB(data); err != nil {
-						return nil, err
-					}
-				} else {
-					return nil, err
-				}
-				continue
-			}
-		}
-
-		if _, ok := fieldValue.Interface().(convert.Conversion); ok {
-			if data, err := value2Bytes(&rawValue); err == nil {
-				if fieldValue.Kind() == reflect.Ptr && fieldValue.IsNil() {
-					fieldValue.Set(reflect.New(fieldValue.Type().Elem()))
-				}
-				fieldValue.Interface().(convert.Conversion).FromDB(data)
-			} else {
-				return nil, err
-			}
-			continue
-		}
-
-		rawValueType := reflect.TypeOf(rawValue.Interface())
-		vv := reflect.ValueOf(rawValue.Interface())
-		col := table.GetColumnIdx(key, idx)
 		if col.IsPrimaryKey {
-			pk = append(pk, rawValue.Interface())
-		}
-		fieldType := fieldValue.Type()
-		hasAssigned := false
-
-		if col.IsJSON {
-			var bs []byte
-			if rawValueType.Kind() == reflect.String {
-				bs = []byte(vv.String())
-			} else if rawValueType.ConvertibleTo(schemas.BytesType) {
-				bs = vv.Bytes()
-			} else {
-				return nil, fmt.Errorf("unsupported database data type: %s %v", key, rawValueType.Kind())
-			}
-
-			hasAssigned = true
-
-			if len(bs) > 0 {
-				if fieldType.Kind() == reflect.String {
-					fieldValue.SetString(string(bs))
-					continue
-				}
-				if fieldValue.CanAddr() {
-					err := json.DefaultJSONHandler.Unmarshal(bs, fieldValue.Addr().Interface())
-					if err != nil {
-						return nil, err
-					}
-				} else {
-					x := reflect.New(fieldType)
-					err := json.DefaultJSONHandler.Unmarshal(bs, x.Interface())
-					if err != nil {
-						return nil, err
-					}
-					fieldValue.Set(x.Elem())
-				}
-			}
-
-			continue
-		}
-
-		switch fieldType.Kind() {
-		case reflect.Complex64, reflect.Complex128:
-			// TODO: reimplement this
-			var bs []byte
-			if rawValueType.Kind() == reflect.String {
-				bs = []byte(vv.String())
-			} else if rawValueType.ConvertibleTo(schemas.BytesType) {
-				bs = vv.Bytes()
-			}
-
-			hasAssigned = true
-			if len(bs) > 0 {
-				if fieldValue.CanAddr() {
-					err := json.DefaultJSONHandler.Unmarshal(bs, fieldValue.Addr().Interface())
-					if err != nil {
-						return nil, err
-					}
-				} else {
-					x := reflect.New(fieldType)
-					err := json.DefaultJSONHandler.Unmarshal(bs, x.Interface())
-					if err != nil {
-						return nil, err
-					}
-					fieldValue.Set(x.Elem())
-				}
-			}
-		case reflect.Slice, reflect.Array:
-			switch rawValueType.Kind() {
-			case reflect.Slice, reflect.Array:
-				switch rawValueType.Elem().Kind() {
-				case reflect.Uint8:
-					if fieldType.Elem().Kind() == reflect.Uint8 {
-						hasAssigned = true
-						if col.SQLType.IsText() {
-							x := reflect.New(fieldType)
-							err := json.DefaultJSONHandler.Unmarshal(vv.Bytes(), x.Interface())
-							if err != nil {
-								return nil, err
-							}
-							fieldValue.Set(x.Elem())
-						} else {
-							if fieldValue.Len() > 0 {
-								for i := 0; i < fieldValue.Len(); i++ {
-									if i < vv.Len() {
-										fieldValue.Index(i).Set(vv.Index(i))
-									}
-								}
-							} else {
-								for i := 0; i < vv.Len(); i++ {
-									fieldValue.Set(reflect.Append(*fieldValue, vv.Index(i)))
-								}
-							}
-						}
-					}
-				}
-			}
-		case reflect.String:
-			if rawValueType.Kind() == reflect.String {
-				hasAssigned = true
-				fieldValue.SetString(vv.String())
-			}
-		case reflect.Bool:
-			if rawValueType.Kind() == reflect.Bool {
-				hasAssigned = true
-				fieldValue.SetBool(vv.Bool())
-			}
-		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-			switch rawValueType.Kind() {
-			case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-				hasAssigned = true
-				fieldValue.SetInt(vv.Int())
-			}
-		case reflect.Float32, reflect.Float64:
-			switch rawValueType.Kind() {
-			case reflect.Float32, reflect.Float64:
-				hasAssigned = true
-				fieldValue.SetFloat(vv.Float())
-			}
-		case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
-			switch rawValueType.Kind() {
-			case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
-				hasAssigned = true
-				fieldValue.SetUint(vv.Uint())
-			case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-				hasAssigned = true
-				fieldValue.SetUint(uint64(vv.Int()))
-			}
-		case reflect.Struct:
-			if fieldType.ConvertibleTo(schemas.TimeType) {
-				dbTZ := session.engine.DatabaseTZ
-				if col.TimeZone != nil {
-					dbTZ = col.TimeZone
-				}
-
-				if rawValueType == schemas.TimeType {
-					hasAssigned = true
-
-					t := vv.Convert(schemas.TimeType).Interface().(time.Time)
-
-					z, _ := t.Zone()
-					// set new location if database don't save timezone or give an incorrect timezone
-					if len(z) == 0 || t.Year() == 0 || t.Location().String() != dbTZ.String() { // !nashtsai! HACK tmp work around for lib/pq doesn't properly time with location
-						session.engine.logger.Debugf("empty zone key[%v] : %v | zone: %v | location: %+v\n", key, t, z, *t.Location())
-						t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(),
-							t.Minute(), t.Second(), t.Nanosecond(), dbTZ)
-					}
-
-					t = t.In(session.engine.TZLocation)
-					fieldValue.Set(reflect.ValueOf(t).Convert(fieldType))
-				} else if rawValueType == schemas.IntType || rawValueType == schemas.Int64Type ||
-					rawValueType == schemas.Int32Type {
-					hasAssigned = true
-
-					t := time.Unix(vv.Int(), 0).In(session.engine.TZLocation)
-					fieldValue.Set(reflect.ValueOf(t).Convert(fieldType))
-				} else {
-					if d, ok := vv.Interface().([]uint8); ok {
-						hasAssigned = true
-						t, err := session.byte2Time(col, d)
-						if err != nil {
-							session.engine.logger.Errorf("byte2Time error: %v", err)
-							hasAssigned = false
-						} else {
-							fieldValue.Set(reflect.ValueOf(t).Convert(fieldType))
-						}
-					} else if d, ok := vv.Interface().(string); ok {
-						hasAssigned = true
-						t, err := session.str2Time(col, d)
-						if err != nil {
-							session.engine.logger.Errorf("byte2Time error: %v", err)
-							hasAssigned = false
-						} else {
-							fieldValue.Set(reflect.ValueOf(t).Convert(fieldType))
-						}
-					} else {
-						return nil, fmt.Errorf("rawValueType is %v, value is %v", rawValueType, vv.Interface())
-					}
-				}
-			} else if nulVal, ok := fieldValue.Addr().Interface().(sql.Scanner); ok {
-				// !<winxxp>! 增加支持sql.Scanner接口的结构，如sql.NullString
-				hasAssigned = true
-				if err := nulVal.Scan(vv.Interface()); err != nil {
-					session.engine.logger.Errorf("sql.Sanner error: %v", err)
-					hasAssigned = false
-				}
-			} else if col.IsJSON {
-				if rawValueType.Kind() == reflect.String {
-					hasAssigned = true
-					x := reflect.New(fieldType)
-					if len([]byte(vv.String())) > 0 {
-						err := json.DefaultJSONHandler.Unmarshal([]byte(vv.String()), x.Interface())
-						if err != nil {
-							return nil, err
-						}
-						fieldValue.Set(x.Elem())
-					}
-				} else if rawValueType.Kind() == reflect.Slice {
-					hasAssigned = true
-					x := reflect.New(fieldType)
-					if len(vv.Bytes()) > 0 {
-						err := json.DefaultJSONHandler.Unmarshal(vv.Bytes(), x.Interface())
-						if err != nil {
-							return nil, err
-						}
-						fieldValue.Set(x.Elem())
-					}
-				}
-			} else if session.statement.UseCascade {
-				table, err := session.engine.tagParser.ParseWithCache(*fieldValue)
-				if err != nil {
-					return nil, err
-				}
-
-				hasAssigned = true
-				if len(table.PrimaryKeys) != 1 {
-					return nil, errors.New("unsupported non or composited primary key cascade")
-				}
-				var pk = make(schemas.PK, len(table.PrimaryKeys))
-				pk[0], err = asKind(vv, rawValueType)
-				if err != nil {
-					return nil, err
-				}
-
-				if !pk.IsZero() {
-					// !nashtsai! TODO for hasOne relationship, it's preferred to use join query for eager fetch
-					// however, also need to consider adding a 'lazy' attribute to xorm tag which allow hasOne
-					// property to be fetched lazily
-					structInter := reflect.New(fieldValue.Type())
-					has, err := session.ID(pk).NoCascade().get(structInter.Interface())
-					if err != nil {
-						return nil, err
-					}
-					if has {
-						fieldValue.Set(structInter.Elem())
-					} else {
-						return nil, errors.New("cascade obj is not exist")
-					}
-				}
-			}
-		case reflect.Ptr:
-			// !nashtsai! TODO merge duplicated codes above
-			switch fieldType {
-			// following types case matching ptr's native type, therefore assign ptr directly
-			case schemas.PtrStringType:
-				if rawValueType.Kind() == reflect.String {
-					x := vv.String()
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrBoolType:
-				if rawValueType.Kind() == reflect.Bool {
-					x := vv.Bool()
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrTimeType:
-				if rawValueType == schemas.PtrTimeType {
-					hasAssigned = true
-					var x = rawValue.Interface().(time.Time)
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrFloat64Type:
-				if rawValueType.Kind() == reflect.Float64 {
-					x := vv.Float()
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrUint64Type:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = uint64(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrInt64Type:
-				if rawValueType.Kind() == reflect.Int64 {
-					x := vv.Int()
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrFloat32Type:
-				if rawValueType.Kind() == reflect.Float64 {
-					var x = float32(vv.Float())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrIntType:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = int(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrInt32Type:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = int32(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrInt8Type:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = int8(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrInt16Type:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = int16(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrUintType:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = uint(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.PtrUint32Type:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = uint32(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.Uint8Type:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = uint8(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.Uint16Type:
-				if rawValueType.Kind() == reflect.Int64 {
-					var x = uint16(vv.Int())
-					hasAssigned = true
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-			case schemas.Complex64Type:
-				var x complex64
-				if len([]byte(vv.String())) > 0 {
-					err := json.DefaultJSONHandler.Unmarshal([]byte(vv.String()), &x)
-					if err != nil {
-						return nil, err
-					}
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-				hasAssigned = true
-			case schemas.Complex128Type:
-				var x complex128
-				if len([]byte(vv.String())) > 0 {
-					err := json.DefaultJSONHandler.Unmarshal([]byte(vv.String()), &x)
-					if err != nil {
-						return nil, err
-					}
-					fieldValue.Set(reflect.ValueOf(&x))
-				}
-				hasAssigned = true
-			} // switch fieldType
-		} // switch fieldType.Kind()
-
-		// !nashtsai! for value can't be assigned directly fallback to convert to []byte then back to value
-		if !hasAssigned {
-			data, err := value2Bytes(&rawValue)
-			if err != nil {
-				return nil, err
-			}
-
-			if err = session.bytes2Value(col, fieldValue, data); err != nil {
-				return nil, err
-			}
+			pk = append(pk, scanResults[i])
 		}
 	}
 	return pk, nil
diff --git a/session_convert.go b/session_convert.go
deleted file mode 100644
index b8218a77..00000000
--- a/session_convert.go
+++ /dev/null
@@ -1,521 +0,0 @@
-// Copyright 2017 The Xorm Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package xorm
-
-import (
-	"database/sql"
-	"errors"
-	"fmt"
-	"reflect"
-	"strconv"
-	"strings"
-	"time"
-
-	"xorm.io/xorm/convert"
-	"xorm.io/xorm/internal/json"
-	"xorm.io/xorm/internal/utils"
-	"xorm.io/xorm/schemas"
-)
-
-func (session *Session) str2Time(col *schemas.Column, data string) (outTime time.Time, outErr error) {
-	sdata := strings.TrimSpace(data)
-	var x time.Time
-	var err error
-
-	var parseLoc = session.engine.DatabaseTZ
-	if col.TimeZone != nil {
-		parseLoc = col.TimeZone
-	}
-
-	if sdata == utils.ZeroTime0 || sdata == utils.ZeroTime1 {
-	} else if !strings.ContainsAny(sdata, "- :") { // !nashtsai! has only found that mymysql driver is using this for time type column
-		// time stamp
-		sd, err := strconv.ParseInt(sdata, 10, 64)
-		if err == nil {
-			x = time.Unix(sd, 0)
-		}
-	} else if len(sdata) > 19 && strings.Contains(sdata, "-") {
-		x, err = time.ParseInLocation(time.RFC3339Nano, sdata, parseLoc)
-		session.engine.logger.Debugf("time(1) key[%v]: %+v | sdata: [%v]\n", col.Name, x, sdata)
-		if err != nil {
-			x, err = time.ParseInLocation("2006-01-02 15:04:05.999999999", sdata, parseLoc)
-		}
-		if err != nil {
-			x, err = time.ParseInLocation("2006-01-02 15:04:05.9999999 Z07:00", sdata, parseLoc)
-		}
-	} else if len(sdata) == 19 && strings.Contains(sdata, "-") {
-		x, err = time.ParseInLocation("2006-01-02 15:04:05", sdata, parseLoc)
-	} else if len(sdata) == 10 && sdata[4] == '-' && sdata[7] == '-' {
-		x, err = time.ParseInLocation("2006-01-02", sdata, parseLoc)
-	} else if col.SQLType.Name == schemas.Time {
-		if strings.Contains(sdata, " ") {
-			ssd := strings.Split(sdata, " ")
-			sdata = ssd[1]
-		}
-
-		sdata = strings.TrimSpace(sdata)
-		if session.engine.dialect.URI().DBType == schemas.MYSQL && len(sdata) > 8 {
-			sdata = sdata[len(sdata)-8:]
-		}
-
-		st := fmt.Sprintf("2006-01-02 %v", sdata)
-		x, err = time.ParseInLocation("2006-01-02 15:04:05", st, parseLoc)
-	} else {
-		outErr = fmt.Errorf("unsupported time format %v", sdata)
-		return
-	}
-	if err != nil {
-		outErr = fmt.Errorf("unsupported time format %v: %v", sdata, err)
-		return
-	}
-	outTime = x.In(session.engine.TZLocation)
-	return
-}
-
-func (session *Session) byte2Time(col *schemas.Column, data []byte) (outTime time.Time, outErr error) {
-	return session.str2Time(col, string(data))
-}
-
-// convert a db data([]byte) to a field value
-func (session *Session) bytes2Value(col *schemas.Column, fieldValue *reflect.Value, data []byte) error {
-	if structConvert, ok := fieldValue.Addr().Interface().(convert.Conversion); ok {
-		return structConvert.FromDB(data)
-	}
-
-	if structConvert, ok := fieldValue.Interface().(convert.Conversion); ok {
-		return structConvert.FromDB(data)
-	}
-
-	var v interface{}
-	key := col.Name
-	fieldType := fieldValue.Type()
-
-	switch fieldType.Kind() {
-	case reflect.Complex64, reflect.Complex128:
-		x := reflect.New(fieldType)
-		if len(data) > 0 {
-			err := json.DefaultJSONHandler.Unmarshal(data, x.Interface())
-			if err != nil {
-				return err
-			}
-			fieldValue.Set(x.Elem())
-		}
-	case reflect.Slice, reflect.Array, reflect.Map:
-		v = data
-		t := fieldType.Elem()
-		k := t.Kind()
-		if col.SQLType.IsText() {
-			x := reflect.New(fieldType)
-			if len(data) > 0 {
-				err := json.DefaultJSONHandler.Unmarshal(data, x.Interface())
-				if err != nil {
-					return err
-				}
-				fieldValue.Set(x.Elem())
-			}
-		} else if col.SQLType.IsBlob() {
-			if k == reflect.Uint8 {
-				fieldValue.Set(reflect.ValueOf(v))
-			} else {
-				x := reflect.New(fieldType)
-				if len(data) > 0 {
-					err := json.DefaultJSONHandler.Unmarshal(data, x.Interface())
-					if err != nil {
-						return err
-					}
-					fieldValue.Set(x.Elem())
-				}
-			}
-		} else {
-			return ErrUnSupportedType
-		}
-	case reflect.String:
-		fieldValue.SetString(string(data))
-	case reflect.Bool:
-		v, err := asBool(data)
-		if err != nil {
-			return fmt.Errorf("arg %v as bool: %s", key, err.Error())
-		}
-		fieldValue.Set(reflect.ValueOf(v))
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		sdata := string(data)
-		var x int64
-		var err error
-		// for mysql, when use bit, it returned \x01
-		if col.SQLType.Name == schemas.Bit &&
-			session.engine.dialect.URI().DBType == schemas.MYSQL { // !nashtsai! TODO dialect needs to provide conversion interface API
-			if len(data) == 1 {
-				x = int64(data[0])
-			} else {
-				x = 0
-			}
-		} else if strings.HasPrefix(sdata, "0x") {
-			x, err = strconv.ParseInt(sdata, 16, 64)
-		} else if strings.HasPrefix(sdata, "0") {
-			x, err = strconv.ParseInt(sdata, 8, 64)
-		} else if strings.EqualFold(sdata, "true") {
-			x = 1
-		} else if strings.EqualFold(sdata, "false") {
-			x = 0
-		} else {
-			x, err = strconv.ParseInt(sdata, 10, 64)
-		}
-		if err != nil {
-			return fmt.Errorf("arg %v as int: %s", key, err.Error())
-		}
-		fieldValue.SetInt(x)
-	case reflect.Float32, reflect.Float64:
-		x, err := strconv.ParseFloat(string(data), 64)
-		if err != nil {
-			return fmt.Errorf("arg %v as float64: %s", key, err.Error())
-		}
-		fieldValue.SetFloat(x)
-	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
-		x, err := strconv.ParseUint(string(data), 10, 64)
-		if err != nil {
-			return fmt.Errorf("arg %v as int: %s", key, err.Error())
-		}
-		fieldValue.SetUint(x)
-	//Currently only support Time type
-	case reflect.Struct:
-		// !<winxxp>! 增加支持sql.Scanner接口的结构，如sql.NullString
-		if nulVal, ok := fieldValue.Addr().Interface().(sql.Scanner); ok {
-			if err := nulVal.Scan(data); err != nil {
-				return fmt.Errorf("sql.Scan(%v) failed: %s ", data, err.Error())
-			}
-		} else {
-			if fieldType.ConvertibleTo(schemas.TimeType) {
-				x, err := session.byte2Time(col, data)
-				if err != nil {
-					return err
-				}
-				v = x
-				fieldValue.Set(reflect.ValueOf(v).Convert(fieldType))
-			} else if session.statement.UseCascade {
-				table, err := session.engine.tagParser.ParseWithCache(*fieldValue)
-				if err != nil {
-					return err
-				}
-
-				// TODO: current only support 1 primary key
-				if len(table.PrimaryKeys) > 1 {
-					return errors.New("unsupported composited primary key cascade")
-				}
-
-				var pk = make(schemas.PK, len(table.PrimaryKeys))
-				rawValueType := table.ColumnType(table.PKColumns()[0].FieldName)
-				pk[0], err = str2PK(string(data), rawValueType)
-				if err != nil {
-					return err
-				}
-
-				if !pk.IsZero() {
-					// !nashtsai! TODO for hasOne relationship, it's preferred to use join query for eager fetch
-					// however, also need to consider adding a 'lazy' attribute to xorm tag which allow hasOne
-					// property to be fetched lazily
-					structInter := reflect.New(fieldValue.Type())
-					has, err := session.ID(pk).NoCascade().get(structInter.Interface())
-					if err != nil {
-						return err
-					}
-					if has {
-						v = structInter.Elem().Interface()
-						fieldValue.Set(reflect.ValueOf(v))
-					} else {
-						return errors.New("cascade obj is not exist")
-					}
-				}
-			}
-		}
-	case reflect.Ptr:
-		// !nashtsai! TODO merge duplicated codes above
-		//typeStr := fieldType.String()
-		switch fieldType.Elem().Kind() {
-		// case "*string":
-		case schemas.StringType.Kind():
-			x := string(data)
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*bool":
-		case schemas.BoolType.Kind():
-			d := string(data)
-			v, err := strconv.ParseBool(d)
-			if err != nil {
-				return fmt.Errorf("arg %v as bool: %s", key, err.Error())
-			}
-			fieldValue.Set(reflect.ValueOf(&v).Convert(fieldType))
-		// case "*complex64":
-		case schemas.Complex64Type.Kind():
-			var x complex64
-			if len(data) > 0 {
-				err := json.DefaultJSONHandler.Unmarshal(data, &x)
-				if err != nil {
-					return err
-				}
-				fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-			}
-		// case "*complex128":
-		case schemas.Complex128Type.Kind():
-			var x complex128
-			if len(data) > 0 {
-				err := json.DefaultJSONHandler.Unmarshal(data, &x)
-				if err != nil {
-					return err
-				}
-				fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-			}
-		// case "*float64":
-		case schemas.Float64Type.Kind():
-			x, err := strconv.ParseFloat(string(data), 64)
-			if err != nil {
-				return fmt.Errorf("arg %v as float64: %s", key, err.Error())
-			}
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*float32":
-		case schemas.Float32Type.Kind():
-			var x float32
-			x1, err := strconv.ParseFloat(string(data), 32)
-			if err != nil {
-				return fmt.Errorf("arg %v as float32: %s", key, err.Error())
-			}
-			x = float32(x1)
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*uint64":
-		case schemas.Uint64Type.Kind():
-			var x uint64
-			x, err := strconv.ParseUint(string(data), 10, 64)
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*uint":
-		case schemas.UintType.Kind():
-			var x uint
-			x1, err := strconv.ParseUint(string(data), 10, 64)
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			x = uint(x1)
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*uint32":
-		case schemas.Uint32Type.Kind():
-			var x uint32
-			x1, err := strconv.ParseUint(string(data), 10, 64)
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			x = uint32(x1)
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*uint8":
-		case schemas.Uint8Type.Kind():
-			var x uint8
-			x1, err := strconv.ParseUint(string(data), 10, 64)
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			x = uint8(x1)
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*uint16":
-		case schemas.Uint16Type.Kind():
-			var x uint16
-			x1, err := strconv.ParseUint(string(data), 10, 64)
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			x = uint16(x1)
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*int64":
-		case schemas.Int64Type.Kind():
-			sdata := string(data)
-			var x int64
-			var err error
-			// for mysql, when use bit, it returned \x01
-			if col.SQLType.Name == schemas.Bit &&
-				strings.Contains(session.engine.DriverName(), "mysql") {
-				if len(data) == 1 {
-					x = int64(data[0])
-				} else {
-					x = 0
-				}
-			} else if strings.HasPrefix(sdata, "0x") {
-				x, err = strconv.ParseInt(sdata, 16, 64)
-			} else if strings.HasPrefix(sdata, "0") {
-				x, err = strconv.ParseInt(sdata, 8, 64)
-			} else {
-				x, err = strconv.ParseInt(sdata, 10, 64)
-			}
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*int":
-		case schemas.IntType.Kind():
-			sdata := string(data)
-			var x int
-			var x1 int64
-			var err error
-			// for mysql, when use bit, it returned \x01
-			if col.SQLType.Name == schemas.Bit &&
-				strings.Contains(session.engine.DriverName(), "mysql") {
-				if len(data) == 1 {
-					x = int(data[0])
-				} else {
-					x = 0
-				}
-			} else if strings.HasPrefix(sdata, "0x") {
-				x1, err = strconv.ParseInt(sdata, 16, 64)
-				x = int(x1)
-			} else if strings.HasPrefix(sdata, "0") {
-				x1, err = strconv.ParseInt(sdata, 8, 64)
-				x = int(x1)
-			} else {
-				x1, err = strconv.ParseInt(sdata, 10, 64)
-				x = int(x1)
-			}
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*int32":
-		case schemas.Int32Type.Kind():
-			sdata := string(data)
-			var x int32
-			var x1 int64
-			var err error
-			// for mysql, when use bit, it returned \x01
-			if col.SQLType.Name == schemas.Bit &&
-				session.engine.dialect.URI().DBType == schemas.MYSQL {
-				if len(data) == 1 {
-					x = int32(data[0])
-				} else {
-					x = 0
-				}
-			} else if strings.HasPrefix(sdata, "0x") {
-				x1, err = strconv.ParseInt(sdata, 16, 64)
-				x = int32(x1)
-			} else if strings.HasPrefix(sdata, "0") {
-				x1, err = strconv.ParseInt(sdata, 8, 64)
-				x = int32(x1)
-			} else {
-				x1, err = strconv.ParseInt(sdata, 10, 64)
-				x = int32(x1)
-			}
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*int8":
-		case schemas.Int8Type.Kind():
-			sdata := string(data)
-			var x int8
-			var x1 int64
-			var err error
-			// for mysql, when use bit, it returned \x01
-			if col.SQLType.Name == schemas.Bit &&
-				strings.Contains(session.engine.DriverName(), "mysql") {
-				if len(data) == 1 {
-					x = int8(data[0])
-				} else {
-					x = 0
-				}
-			} else if strings.HasPrefix(sdata, "0x") {
-				x1, err = strconv.ParseInt(sdata, 16, 64)
-				x = int8(x1)
-			} else if strings.HasPrefix(sdata, "0") {
-				x1, err = strconv.ParseInt(sdata, 8, 64)
-				x = int8(x1)
-			} else {
-				x1, err = strconv.ParseInt(sdata, 10, 64)
-				x = int8(x1)
-			}
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*int16":
-		case schemas.Int16Type.Kind():
-			sdata := string(data)
-			var x int16
-			var x1 int64
-			var err error
-			// for mysql, when use bit, it returned \x01
-			if col.SQLType.Name == schemas.Bit &&
-				strings.Contains(session.engine.DriverName(), "mysql") {
-				if len(data) == 1 {
-					x = int16(data[0])
-				} else {
-					x = 0
-				}
-			} else if strings.HasPrefix(sdata, "0x") {
-				x1, err = strconv.ParseInt(sdata, 16, 64)
-				x = int16(x1)
-			} else if strings.HasPrefix(sdata, "0") {
-				x1, err = strconv.ParseInt(sdata, 8, 64)
-				x = int16(x1)
-			} else {
-				x1, err = strconv.ParseInt(sdata, 10, 64)
-				x = int16(x1)
-			}
-			if err != nil {
-				return fmt.Errorf("arg %v as int: %s", key, err.Error())
-			}
-			fieldValue.Set(reflect.ValueOf(&x).Convert(fieldType))
-		// case "*SomeStruct":
-		case reflect.Struct:
-			switch fieldType {
-			// case "*.time.Time":
-			case schemas.PtrTimeType:
-				x, err := session.byte2Time(col, data)
-				if err != nil {
-					return err
-				}
-				v = x
-				fieldValue.Set(reflect.ValueOf(&x))
-			default:
-				if session.statement.UseCascade {
-					structInter := reflect.New(fieldType.Elem())
-					table, err := session.engine.tagParser.ParseWithCache(structInter.Elem())
-					if err != nil {
-						return err
-					}
-
-					if len(table.PrimaryKeys) > 1 {
-						return errors.New("unsupported composited primary key cascade")
-					}
-
-					var pk = make(schemas.PK, len(table.PrimaryKeys))
-					rawValueType := table.ColumnType(table.PKColumns()[0].FieldName)
-					pk[0], err = str2PK(string(data), rawValueType)
-					if err != nil {
-						return err
-					}
-
-					if !pk.IsZero() {
-						// !nashtsai! TODO for hasOne relationship, it's preferred to use join query for eager fetch
-						// however, also need to consider adding a 'lazy' attribute to xorm tag which allow hasOne
-						// property to be fetched lazily
-						has, err := session.ID(pk).NoCascade().get(structInter.Interface())
-						if err != nil {
-							return err
-						}
-						if has {
-							v = structInter.Interface()
-							fieldValue.Set(reflect.ValueOf(v))
-						} else {
-							return errors.New("cascade obj is not exist")
-						}
-					}
-				} else {
-					return fmt.Errorf("unsupported struct type in Scan: %s", fieldValue.Type().String())
-				}
-			}
-		default:
-			return fmt.Errorf("unsupported type in Scan: %s", fieldValue.Type().String())
-		}
-	default:
-		return fmt.Errorf("unsupported type in Scan: %s", fieldValue.Type().String())
-	}
-
-	return nil
-}
diff --git a/session_delete.go b/session_delete.go
index 13bf791f..baabb558 100644
--- a/session_delete.go
+++ b/session_delete.go
@@ -83,7 +83,7 @@ func (session *Session) cacheDelete(table *schemas.Table, tableName, sqlStr stri
 }
 
 // Delete records, bean's non-empty fields are conditions
-func (session *Session) Delete(bean interface{}) (int64, error) {
+func (session *Session) Delete(beans ...interface{}) (int64, error) {
 	if session.isAutoClose {
 		defer session.Close()
 	}
@@ -92,20 +92,32 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 		return 0, session.statement.LastError
 	}
 
-	if err := session.statement.SetRefBean(bean); err != nil {
-		return 0, err
+	var (
+		condSQL  string
+		condArgs []interface{}
+		err      error
+		bean     interface{}
+	)
+	if len(beans) > 0 {
+		bean = beans[0]
+		if err = session.statement.SetRefBean(bean); err != nil {
+			return 0, err
+		}
+
+		executeBeforeClosures(session, bean)
+
+		if processor, ok := interface{}(bean).(BeforeDeleteProcessor); ok {
+			processor.BeforeDelete()
+		}
+
+		condSQL, condArgs, err = session.statement.GenConds(bean)
+	} else {
+		condSQL, condArgs, err = session.statement.GenCondSQL(session.statement.Conds())
 	}
-
-	executeBeforeClosures(session, bean)
-
-	if processor, ok := interface{}(bean).(BeforeDeleteProcessor); ok {
-		processor.BeforeDelete()
-	}
-
-	condSQL, condArgs, err := session.statement.GenConds(bean)
 	if err != nil {
 		return 0, err
 	}
+
 	pLimitN := session.statement.LimitN
 	if len(condSQL) == 0 && (pLimitN == nil || *pLimitN == 0) {
 		return 0, ErrNeedDeletedCond
@@ -156,7 +168,7 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 
 	var realSQL string
 	argsForCache := make([]interface{}, 0, len(condArgs)*2)
-	if session.statement.GetUnscoped() || table.DeletedColumn() == nil { // tag "deleted" is disabled
+	if session.statement.GetUnscoped() || table == nil || table.DeletedColumn() == nil { // tag "deleted" is disabled
 		realSQL = deleteSQL
 		copy(argsForCache, condArgs)
 		argsForCache = append(condArgs, argsForCache...)
@@ -220,27 +232,29 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 		return 0, err
 	}
 
-	// handle after delete processors
-	if session.isAutoCommit {
-		for _, closure := range session.afterClosures {
-			closure(bean)
-		}
-		if processor, ok := interface{}(bean).(AfterDeleteProcessor); ok {
-			processor.AfterDelete()
-		}
-	} else {
-		lenAfterClosures := len(session.afterClosures)
-		if lenAfterClosures > 0 {
-			if value, has := session.afterDeleteBeans[bean]; has && value != nil {
-				*value = append(*value, session.afterClosures...)
-			} else {
-				afterClosures := make([]func(interface{}), lenAfterClosures)
-				copy(afterClosures, session.afterClosures)
-				session.afterDeleteBeans[bean] = &afterClosures
+	if bean != nil {
+		// handle after delete processors
+		if session.isAutoCommit {
+			for _, closure := range session.afterClosures {
+				closure(bean)
+			}
+			if processor, ok := interface{}(bean).(AfterDeleteProcessor); ok {
+				processor.AfterDelete()
 			}
 		} else {
-			if _, ok := interface{}(bean).(AfterDeleteProcessor); ok {
-				session.afterDeleteBeans[bean] = nil
+			lenAfterClosures := len(session.afterClosures)
+			if lenAfterClosures > 0 && len(beans) > 0 {
+				if value, has := session.afterDeleteBeans[beans[0]]; has && value != nil {
+					*value = append(*value, session.afterClosures...)
+				} else {
+					afterClosures := make([]func(interface{}), lenAfterClosures)
+					copy(afterClosures, session.afterClosures)
+					session.afterDeleteBeans[bean] = &afterClosures
+				}
+			} else {
+				if _, ok := interface{}(bean).(AfterDeleteProcessor); ok {
+					session.afterDeleteBeans[bean] = nil
+				}
 			}
 		}
 	}
diff --git a/session_exist.go b/session_exist.go
index e52c618e..b5e4a655 100644
--- a/session_exist.go
+++ b/session_exist.go
@@ -25,5 +25,8 @@ func (session *Session) Exist(bean ...interface{}) (bool, error) {
 	}
 	defer rows.Close()
 
-	return rows.Next(), nil
+	if rows.Next() {
+		return true, nil
+	}
+	return false, rows.Err()
 }
diff --git a/session_find.go b/session_find.go
index 0daea005..010ecd6c 100644
--- a/session_find.go
+++ b/session_find.go
@@ -172,6 +172,11 @@ func (session *Session) noCacheFind(table *schemas.Table, containerValue reflect
 		return err
 	}
 
+	types, err := rows.ColumnTypes()
+	if err != nil {
+		return err
+	}
+
 	var newElemFunc func(fields []string) reflect.Value
 	elemType := containerValue.Type().Elem()
 	var isPointer bool
@@ -241,7 +246,7 @@ func (session *Session) noCacheFind(table *schemas.Table, containerValue reflect
 		if err != nil {
 			return err
 		}
-		err = session.rows2Beans(rows, fields, tb, newElemFunc, containerValueSetFunc)
+		err = session.rows2Beans(rows, fields, types, tb, newElemFunc, containerValueSetFunc)
 		rows.Close()
 		if err != nil {
 			return err
@@ -270,13 +275,13 @@ func (session *Session) noCacheFind(table *schemas.Table, containerValue reflect
 			return err
 		}
 	}
-	return nil
+	return rows.Err()
 }
 
 func convertPKToValue(table *schemas.Table, dst interface{}, pk schemas.PK) error {
 	cols := table.PKColumns()
 	if len(cols) == 1 {
-		return convertAssign(dst, pk[0])
+		return convertAssign(dst, pk[0], nil, nil)
 	}
 
 	dst = pk
@@ -337,6 +342,9 @@ func (session *Session) cacheFind(t reflect.Type, sqlStr string, rowsSlicePtr in
 
 			ids = append(ids, pk)
 		}
+		if rows.Err() != nil {
+			return rows.Err()
+		}
 
 		session.engine.logger.Debugf("[cache] cache sql: %v, %v, %v, %v, %v", ids, tableName, sqlStr, newsql, args)
 		err = caches.PutCacheSql(cacher, ids, tableName, newsql, args)
diff --git a/session_get.go b/session_get.go
index e303176d..08172524 100644
--- a/session_get.go
+++ b/session_get.go
@@ -6,12 +6,17 @@ package xorm
 
 import (
 	"database/sql"
+	"database/sql/driver"
 	"errors"
 	"fmt"
+	"math/big"
 	"reflect"
 	"strconv"
+	"time"
 
 	"xorm.io/xorm/caches"
+	"xorm.io/xorm/convert"
+	"xorm.io/xorm/core"
 	"xorm.io/xorm/internal/utils"
 	"xorm.io/xorm/schemas"
 )
@@ -30,6 +35,19 @@ func (session *Session) Get(bean interface{}) (bool, error) {
 	return session.get(bean)
 }
 
+func isPtrOfTime(v interface{}) bool {
+	if _, ok := v.(*time.Time); ok {
+		return true
+	}
+
+	el := reflect.ValueOf(v).Elem()
+	if el.Kind() != reflect.Struct {
+		return false
+	}
+
+	return el.Type().ConvertibleTo(schemas.TimeType)
+}
+
 func (session *Session) get(bean interface{}) (bool, error) {
 	defer session.resetStatement()
 
@@ -46,7 +64,7 @@ func (session *Session) get(bean interface{}) (bool, error) {
 		return false, ErrObjectIsNil
 	}
 
-	if beanValue.Elem().Kind() == reflect.Struct {
+	if beanValue.Elem().Kind() == reflect.Struct && !isPtrOfTime(bean) {
 		if err := session.statement.SetRefBean(bean); err != nil {
 			return false, err
 		}
@@ -108,6 +126,31 @@ func (session *Session) get(bean interface{}) (bool, error) {
 	return true, nil
 }
 
+var (
+	valuerTypePlaceHolder driver.Valuer
+	valuerType            = reflect.TypeOf(&valuerTypePlaceHolder).Elem()
+
+	scannerTypePlaceHolder sql.Scanner
+	scannerType            = reflect.TypeOf(&scannerTypePlaceHolder).Elem()
+
+	conversionTypePlaceHolder convert.Conversion
+	conversionType            = reflect.TypeOf(&conversionTypePlaceHolder).Elem()
+)
+
+func isScannableStruct(bean interface{}, typeLen int) bool {
+	switch bean.(type) {
+	case *time.Time:
+		return false
+	case sql.Scanner:
+		return false
+	case convert.Conversion:
+		return typeLen > 1
+	case *big.Float:
+		return false
+	}
+	return true
+}
+
 func (session *Session) nocacheGet(beanKind reflect.Kind, table *schemas.Table, bean interface{}, sqlStr string, args ...interface{}) (bool, error) {
 	rows, err := session.queryRows(sqlStr, args...)
 	if err != nil {
@@ -116,163 +159,128 @@ func (session *Session) nocacheGet(beanKind reflect.Kind, table *schemas.Table,
 	defer rows.Close()
 
 	if !rows.Next() {
-		if rows.Err() != nil {
-			return false, rows.Err()
-		}
-		return false, nil
+		return false, rows.Err()
 	}
 
-	switch bean.(type) {
-	case sql.NullInt64, sql.NullBool, sql.NullFloat64, sql.NullString:
-		return true, rows.Scan(&bean)
-	case *sql.NullInt64, *sql.NullBool, *sql.NullFloat64, *sql.NullString:
-		return true, rows.Scan(bean)
-	case *string:
-		var res sql.NullString
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*string)) = res.String
-		}
-		return true, nil
-	case *int:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*int)) = int(res.Int64)
-		}
-		return true, nil
-	case *int8:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*int8)) = int8(res.Int64)
-		}
-		return true, nil
-	case *int16:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*int16)) = int16(res.Int64)
-		}
-		return true, nil
-	case *int32:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*int32)) = int32(res.Int64)
-		}
-		return true, nil
-	case *int64:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*int64)) = int64(res.Int64)
-		}
-		return true, nil
-	case *uint:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*uint)) = uint(res.Int64)
-		}
-		return true, nil
-	case *uint8:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*uint8)) = uint8(res.Int64)
-		}
-		return true, nil
-	case *uint16:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*uint16)) = uint16(res.Int64)
-		}
-		return true, nil
-	case *uint32:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*uint32)) = uint32(res.Int64)
-		}
-		return true, nil
-	case *uint64:
-		var res sql.NullInt64
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*uint64)) = uint64(res.Int64)
-		}
-		return true, nil
-	case *bool:
-		var res sql.NullBool
-		if err := rows.Scan(&res); err != nil {
-			return true, err
-		}
-		if res.Valid {
-			*(bean.(*bool)) = res.Bool
-		}
-		return true, nil
+	// WARN: Alougth rows return true, but we may also return error.
+	types, err := rows.ColumnTypes()
+	if err != nil {
+		return true, err
+	}
+	fields, err := rows.Columns()
+	if err != nil {
+		return true, err
 	}
-
 	switch beanKind {
 	case reflect.Struct:
-		fields, err := rows.Columns()
-		if err != nil {
-			// WARN: Alougth rows return true, but get fields failed
-			return true, err
+		if !isScannableStruct(bean, len(types)) {
+			break
 		}
-
-		scanResults, err := session.row2Slice(rows, fields, bean)
-		if err != nil {
-			return false, err
-		}
-		// close it before convert data
-		rows.Close()
-
-		dataStruct := utils.ReflectValue(bean)
-		_, err = session.slice2Bean(scanResults, fields, bean, &dataStruct, table)
-		if err != nil {
-			return true, err
-		}
-
-		return true, session.executeProcessors()
+		return session.getStruct(rows, types, fields, table, bean)
 	case reflect.Slice:
-		err = rows.ScanSlice(bean)
+		return session.getSlice(rows, types, fields, bean)
 	case reflect.Map:
-		err = rows.ScanMap(bean)
-	case reflect.String, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
-		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
-		err = rows.Scan(bean)
-	default:
-		err = rows.Scan(bean)
+		return session.getMap(rows, types, fields, bean)
 	}
 
+	return session.getVars(rows, types, fields, bean)
+}
+
+func (session *Session) getSlice(rows *core.Rows, types []*sql.ColumnType, fields []string, bean interface{}) (bool, error) {
+	switch t := bean.(type) {
+	case *[]string:
+		res, err := session.engine.scanStringInterface(rows, fields, types)
+		if err != nil {
+			return true, err
+		}
+
+		var needAppend = len(*t) == 0 // both support slice is empty or has been initlized
+		for i, r := range res {
+			if needAppend {
+				*t = append(*t, r.(*sql.NullString).String)
+			} else {
+				(*t)[i] = r.(*sql.NullString).String
+			}
+		}
+		return true, nil
+	case *[]interface{}:
+		scanResults, err := session.engine.scanInterfaces(rows, fields, types)
+		if err != nil {
+			return true, err
+		}
+		var needAppend = len(*t) == 0
+		for ii := range fields {
+			s, err := convert.Interface2Interface(session.engine.DatabaseTZ, scanResults[ii])
+			if err != nil {
+				return true, err
+			}
+			if needAppend {
+				*t = append(*t, s)
+			} else {
+				(*t)[ii] = s
+			}
+		}
+		return true, nil
+	default:
+		return true, fmt.Errorf("unspoorted slice type: %t", t)
+	}
+}
+
+func (session *Session) getMap(rows *core.Rows, types []*sql.ColumnType, fields []string, bean interface{}) (bool, error) {
+	switch t := bean.(type) {
+	case *map[string]string:
+		scanResults, err := session.engine.scanStringInterface(rows, fields, types)
+		if err != nil {
+			return true, err
+		}
+		for ii, key := range fields {
+			(*t)[key] = scanResults[ii].(*sql.NullString).String
+		}
+		return true, nil
+	case *map[string]interface{}:
+		scanResults, err := session.engine.scanInterfaces(rows, fields, types)
+		if err != nil {
+			return true, err
+		}
+		for ii, key := range fields {
+			s, err := convert.Interface2Interface(session.engine.DatabaseTZ, scanResults[ii])
+			if err != nil {
+				return true, err
+			}
+			(*t)[key] = s
+		}
+		return true, nil
+	default:
+		return true, fmt.Errorf("unspoorted map type: %t", t)
+	}
+}
+
+func (session *Session) getVars(rows *core.Rows, types []*sql.ColumnType, fields []string, beans ...interface{}) (bool, error) {
+	if len(beans) != len(types) {
+		return false, fmt.Errorf("expected columns %d, but only %d variables", len(types), len(beans))
+	}
+
+	err := session.engine.scan(rows, fields, types, beans...)
 	return true, err
 }
 
+func (session *Session) getStruct(rows *core.Rows, types []*sql.ColumnType, fields []string, table *schemas.Table, bean interface{}) (bool, error) {
+	scanResults, err := session.row2Slice(rows, fields, types, bean)
+	if err != nil {
+		return false, err
+	}
+	// close it before convert data
+	rows.Close()
+
+	dataStruct := utils.ReflectValue(bean)
+	_, err = session.slice2Bean(scanResults, fields, bean, &dataStruct, table)
+	if err != nil {
+		return true, err
+	}
+
+	return true, session.executeProcessors()
+}
+
 func (session *Session) cacheGet(bean interface{}, sqlStr string, args ...interface{}) (has bool, err error) {
 	// if has no reftable, then don't use cache currently
 	if !session.canCache() {
@@ -304,9 +312,12 @@ func (session *Session) cacheGet(bean interface{}, sqlStr string, args ...interf
 		if rows.Next() {
 			err = rows.ScanSlice(&res)
 			if err != nil {
-				return false, err
+				return true, err
 			}
 		} else {
+			if rows.Err() != nil {
+				return false, rows.Err()
+			}
 			return false, ErrCacheFailed
 		}
 
diff --git a/session_insert.go b/session_insert.go
index 82d91969..a9b8b7d2 100644
--- a/session_insert.go
+++ b/session_insert.go
@@ -11,6 +11,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 
 	"xorm.io/xorm/internal/utils"
 	"xorm.io/xorm/schemas"
@@ -324,7 +325,6 @@ func (session *Session) innerInsert(bean interface{}) (int64, error) {
 					copy(afterClosures, session.afterClosures)
 					session.afterInsertBeans[bean] = &afterClosures
 				}
-
 			} else {
 				if _, ok := interface{}(bean).(AfterInsertProcessor); ok {
 					session.afterInsertBeans[bean] = nil
@@ -414,7 +414,7 @@ func (session *Session) innerInsert(bean interface{}) (int64, error) {
 			return 1, nil
 		}
 
-		return 1, convertAssignV(aiValue.Addr(), id)
+		return 1, convertAssignV(*aiValue, id)
 	}
 
 	res, err := session.exec(sqlStr, args...)
@@ -454,7 +454,7 @@ func (session *Session) innerInsert(bean interface{}) (int64, error) {
 		return res.RowsAffected()
 	}
 
-	if err := convertAssignV(aiValue.Addr(), id); err != nil {
+	if err := convertAssignV(*aiValue, id); err != nil {
 		return 0, err
 	}
 
@@ -497,6 +497,16 @@ func (session *Session) genInsertColumns(bean interface{}) ([]string, []interfac
 		}
 
 		if col.IsDeleted {
+			colNames = append(colNames, col.Name)
+			if !col.Nullable {
+				if col.SQLType.IsNumeric() {
+					args = append(args, 0)
+				} else {
+					args = append(args, time.Time{}.Format("2006-01-02 15:04:05"))
+				}
+			} else {
+				args = append(args, nil)
+			}
 			continue
 		}
 
diff --git a/session_iterate.go b/session_iterate.go
index 8cab8f48..f6301009 100644
--- a/session_iterate.go
+++ b/session_iterate.go
@@ -54,7 +54,7 @@ func (session *Session) Iterate(bean interface{}, fun IterFunc) error {
 		}
 		i++
 	}
-	return err
+	return rows.Err()
 }
 
 // BufferSize sets the buffersize for iterate
diff --git a/session_query.go b/session_query.go
index 12136466..a4070985 100644
--- a/session_query.go
+++ b/session_query.go
@@ -5,13 +5,7 @@
 package xorm
 
 import (
-	"fmt"
-	"reflect"
-	"strconv"
-	"time"
-
 	"xorm.io/xorm/core"
-	"xorm.io/xorm/schemas"
 )
 
 // Query runs a raw sql and return records as []map[string][]byte
@@ -28,137 +22,50 @@ func (session *Session) Query(sqlOrArgs ...interface{}) ([]map[string][]byte, er
 	return session.queryBytes(sqlStr, args...)
 }
 
-func value2String(rawValue *reflect.Value) (str string, err error) {
-	aa := reflect.TypeOf((*rawValue).Interface())
-	vv := reflect.ValueOf((*rawValue).Interface())
-	switch aa.Kind() {
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		str = strconv.FormatInt(vv.Int(), 10)
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
-		str = strconv.FormatUint(vv.Uint(), 10)
-	case reflect.Float32, reflect.Float64:
-		str = strconv.FormatFloat(vv.Float(), 'f', -1, 64)
-	case reflect.String:
-		str = vv.String()
-	case reflect.Array, reflect.Slice:
-		switch aa.Elem().Kind() {
-		case reflect.Uint8:
-			data := rawValue.Interface().([]byte)
-			str = string(data)
-			if str == "\x00" {
-				str = "0"
-			}
-		default:
-			err = fmt.Errorf("Unsupported struct type %v", vv.Type().Name())
-		}
-	// time type
-	case reflect.Struct:
-		if aa.ConvertibleTo(schemas.TimeType) {
-			str = vv.Convert(schemas.TimeType).Interface().(time.Time).Format(time.RFC3339Nano)
-		} else {
-			err = fmt.Errorf("Unsupported struct type %v", vv.Type().Name())
-		}
-	case reflect.Bool:
-		str = strconv.FormatBool(vv.Bool())
-	case reflect.Complex128, reflect.Complex64:
-		str = fmt.Sprintf("%v", vv.Complex())
-	/* TODO: unsupported types below
-	   case reflect.Map:
-	   case reflect.Ptr:
-	   case reflect.Uintptr:
-	   case reflect.UnsafePointer:
-	   case reflect.Chan, reflect.Func, reflect.Interface:
-	*/
-	default:
-		err = fmt.Errorf("Unsupported struct type %v", vv.Type().Name())
-	}
-	return
-}
-
-func row2mapStr(rows *core.Rows, fields []string) (resultsMap map[string]string, err error) {
-	result := make(map[string]string)
-	scanResultContainers := make([]interface{}, len(fields))
-	for i := 0; i < len(fields); i++ {
-		var scanResultContainer interface{}
-		scanResultContainers[i] = &scanResultContainer
-	}
-	if err := rows.Scan(scanResultContainers...); err != nil {
-		return nil, err
-	}
-
-	for ii, key := range fields {
-		rawValue := reflect.Indirect(reflect.ValueOf(scanResultContainers[ii]))
-		// if row is null then as empty string
-		if rawValue.Interface() == nil {
-			result[key] = ""
-			continue
-		}
-
-		if data, err := value2String(&rawValue); err == nil {
-			result[key] = data
-		} else {
-			return nil, err
-		}
-	}
-	return result, nil
-}
-
-func row2sliceStr(rows *core.Rows, fields []string) (results []string, err error) {
-	result := make([]string, 0, len(fields))
-	scanResultContainers := make([]interface{}, len(fields))
-	for i := 0; i < len(fields); i++ {
-		var scanResultContainer interface{}
-		scanResultContainers[i] = &scanResultContainer
-	}
-	if err := rows.Scan(scanResultContainers...); err != nil {
-		return nil, err
-	}
-
-	for i := 0; i < len(fields); i++ {
-		rawValue := reflect.Indirect(reflect.ValueOf(scanResultContainers[i]))
-		// if row is null then as empty string
-		if rawValue.Interface() == nil {
-			result = append(result, "")
-			continue
-		}
-
-		if data, err := value2String(&rawValue); err == nil {
-			result = append(result, data)
-		} else {
-			return nil, err
-		}
-	}
-	return result, nil
-}
-
-func rows2Strings(rows *core.Rows) (resultsSlice []map[string]string, err error) {
+func (session *Session) rows2Strings(rows *core.Rows) (resultsSlice []map[string]string, err error) {
 	fields, err := rows.Columns()
 	if err != nil {
 		return nil, err
 	}
+	types, err := rows.ColumnTypes()
+	if err != nil {
+		return nil, err
+	}
+
 	for rows.Next() {
-		result, err := row2mapStr(rows, fields)
+		result, err := session.engine.row2mapStr(rows, types, fields)
 		if err != nil {
 			return nil, err
 		}
 		resultsSlice = append(resultsSlice, result)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 
 	return resultsSlice, nil
 }
 
-func rows2SliceString(rows *core.Rows) (resultsSlice [][]string, err error) {
+func (session *Session) rows2SliceString(rows *core.Rows) (resultsSlice [][]string, err error) {
 	fields, err := rows.Columns()
 	if err != nil {
 		return nil, err
 	}
+	types, err := rows.ColumnTypes()
+	if err != nil {
+		return nil, err
+	}
+
 	for rows.Next() {
-		record, err := row2sliceStr(rows, fields)
+		record, err := session.engine.row2sliceStr(rows, types, fields)
 		if err != nil {
 			return nil, err
 		}
 		resultsSlice = append(resultsSlice, record)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 
 	return resultsSlice, nil
 }
@@ -180,7 +87,7 @@ func (session *Session) QueryString(sqlOrArgs ...interface{}) ([]map[string]stri
 	}
 	defer rows.Close()
 
-	return rows2Strings(rows)
+	return session.rows2Strings(rows)
 }
 
 // QuerySliceString runs a raw sql and return records as [][]string
@@ -200,38 +107,28 @@ func (session *Session) QuerySliceString(sqlOrArgs ...interface{}) ([][]string,
 	}
 	defer rows.Close()
 
-	return rows2SliceString(rows)
+	return session.rows2SliceString(rows)
 }
 
-func row2mapInterface(rows *core.Rows, fields []string) (resultsMap map[string]interface{}, err error) {
-	resultsMap = make(map[string]interface{}, len(fields))
-	scanResultContainers := make([]interface{}, len(fields))
-	for i := 0; i < len(fields); i++ {
-		var scanResultContainer interface{}
-		scanResultContainers[i] = &scanResultContainer
-	}
-	if err := rows.Scan(scanResultContainers...); err != nil {
-		return nil, err
-	}
-
-	for ii, key := range fields {
-		resultsMap[key] = reflect.Indirect(reflect.ValueOf(scanResultContainers[ii])).Interface()
-	}
-	return
-}
-
-func rows2Interfaces(rows *core.Rows) (resultsSlice []map[string]interface{}, err error) {
+func (session *Session) rows2Interfaces(rows *core.Rows) (resultsSlice []map[string]interface{}, err error) {
 	fields, err := rows.Columns()
 	if err != nil {
 		return nil, err
 	}
+	types, err := rows.ColumnTypes()
+	if err != nil {
+		return nil, err
+	}
 	for rows.Next() {
-		result, err := row2mapInterface(rows, fields)
+		result, err := session.engine.row2mapInterface(rows, types, fields)
 		if err != nil {
 			return nil, err
 		}
 		resultsSlice = append(resultsSlice, result)
 	}
+	if rows.Err() != nil {
+		return nil, rows.Err()
+	}
 
 	return resultsSlice, nil
 }
@@ -253,5 +150,5 @@ func (session *Session) QueryInterface(sqlOrArgs ...interface{}) ([]map[string]i
 	}
 	defer rows.Close()
 
-	return rows2Interfaces(rows)
+	return session.rows2Interfaces(rows)
 }
diff --git a/session_raw.go b/session_raw.go
index 4cfe297a..7eb8585d 100644
--- a/session_raw.go
+++ b/session_raw.go
@@ -6,7 +6,6 @@ package xorm
 
 import (
 	"database/sql"
-	"reflect"
 
 	"xorm.io/xorm/core"
 )
@@ -71,58 +70,6 @@ func (session *Session) queryRow(sqlStr string, args ...interface{}) *core.Row {
 	return core.NewRow(session.queryRows(sqlStr, args...))
 }
 
-func value2Bytes(rawValue *reflect.Value) ([]byte, error) {
-	str, err := value2String(rawValue)
-	if err != nil {
-		return nil, err
-	}
-	return []byte(str), nil
-}
-
-func row2map(rows *core.Rows, fields []string) (resultsMap map[string][]byte, err error) {
-	result := make(map[string][]byte)
-	scanResultContainers := make([]interface{}, len(fields))
-	for i := 0; i < len(fields); i++ {
-		var scanResultContainer interface{}
-		scanResultContainers[i] = &scanResultContainer
-	}
-	if err := rows.Scan(scanResultContainers...); err != nil {
-		return nil, err
-	}
-
-	for ii, key := range fields {
-		rawValue := reflect.Indirect(reflect.ValueOf(scanResultContainers[ii]))
-		//if row is null then ignore
-		if rawValue.Interface() == nil {
-			result[key] = []byte{}
-			continue
-		}
-
-		if data, err := value2Bytes(&rawValue); err == nil {
-			result[key] = data
-		} else {
-			return nil, err // !nashtsai! REVIEW, should return err or just error log?
-		}
-	}
-	return result, nil
-}
-
-func rows2maps(rows *core.Rows) (resultsSlice []map[string][]byte, err error) {
-	fields, err := rows.Columns()
-	if err != nil {
-		return nil, err
-	}
-	for rows.Next() {
-		result, err := row2map(rows, fields)
-		if err != nil {
-			return nil, err
-		}
-		resultsSlice = append(resultsSlice, result)
-	}
-
-	return resultsSlice, nil
-}
-
 func (session *Session) queryBytes(sqlStr string, args ...interface{}) ([]map[string][]byte, error) {
 	rows, err := session.queryRows(sqlStr, args...)
 	if err != nil {
diff --git a/session_schema.go b/session_schema.go
index 7d36ae7f..7cfcb626 100644
--- a/session_schema.go
+++ b/session_schema.go
@@ -336,8 +336,10 @@ func (session *Session) Sync2(beans ...interface{}) error {
 					}
 				} else {
 					if !(strings.HasPrefix(curType, expectedType) && curType[len(expectedType)] == '(') {
-						engine.logger.Warnf("Table %s column %s db type is %s, struct type is %s",
-							tbNameWithSchema, col.Name, curType, expectedType)
+						if !strings.EqualFold(schemas.SQLTypeName(curType), engine.dialect.Alias(schemas.SQLTypeName(expectedType))) {
+							engine.logger.Warnf("Table %s column %s db type is %s, struct type is %s",
+								tbNameWithSchema, col.Name, curType, expectedType)
+						}
 					}
 				}
 			} else if expectedType == schemas.Varchar {
diff --git a/session_update.go b/session_update.go
index 78907e43..4f8e6961 100644
--- a/session_update.go
+++ b/session_update.go
@@ -81,6 +81,9 @@ func (session *Session) cacheUpdate(table *schemas.Table, tableName, sqlStr stri
 
 			ids = append(ids, pk)
 		}
+		if rows.Err() != nil {
+			return rows.Err()
+		}
 		session.engine.logger.Debugf("[cache] find updated id: %v", ids)
 	} /*else {
 	    session.engine.LogDebug("[xorm:cacheUpdate] del cached sql:", tableName, newsql, args)
diff --git a/tags/parser.go b/tags/parser.go
index d701e316..72baa153 100644
--- a/tags/parser.go
+++ b/tags/parser.go
@@ -124,6 +124,7 @@ func addIndex(indexName string, table *schemas.Table, col *schemas.Column, index
 	}
 }
 
+// ErrIgnoreField represents an error to ignore field
 var ErrIgnoreField = errors.New("field will be ignored")
 
 func (parser *Parser) parseFieldWithNoTag(fieldIndex int, field reflect.StructField, fieldValue reflect.Value) (*schemas.Column, error) {
@@ -296,5 +297,11 @@ func (parser *Parser) Parse(v reflect.Value) (*schemas.Table, error) {
 		table.AddColumn(col)
 	} // end for
 
+	deletedColumn := table.DeletedColumn()
+	// check columns
+	if deletedColumn != nil {
+		deletedColumn.Nullable = true
+	}
+
 	return table, nil
 }
diff --git a/tags/tag.go b/tags/tag.go
index 4a39ba54..641b8c52 100644
--- a/tags/tag.go
+++ b/tags/tag.go
@@ -238,6 +238,7 @@ func UpdatedTagHandler(ctx *Context) error {
 // DeletedTagHandler describes deleted tag handler
 func DeletedTagHandler(ctx *Context) error {
 	ctx.col.IsDeleted = true
+	ctx.col.Nullable = true
 	return nil
 }