diff --git a/dialects/dameng.go b/dialects/dameng.go
index 52b4592a..e988887d 100644
--- a/dialects/dameng.go
+++ b/dialects/dameng.go
@@ -559,9 +559,12 @@ func (db *dameng) SQLType(c *schemas.Column) string {
 		res = "NUMBER"
 	case schemas.Binary, schemas.VarBinary, schemas.Blob, schemas.TinyBlob, schemas.MediumBlob, schemas.LongBlob, schemas.Bytea:
 		return schemas.Blob
-	case schemas.Date, schemas.Time, schemas.DateTime, schemas.TimeStamp:
-		res = schemas.Date
-		return res
+	case schemas.Date:
+		return schemas.Date
+	case schemas.Time:
+		return schemas.Time
+	case schemas.DateTime, schemas.TimeStamp:
+		return schemas.TimeStamp
 	case schemas.TimeStampz:
 		res = "TIMESTAMP"
 	case schemas.Float, schemas.Double, schemas.Numeric, schemas.Decimal:
@@ -613,7 +616,12 @@ func (db *dameng) DropTableSQL(tableName string) (string, bool) {
 	return fmt.Sprintf("DROP TABLE %s", db.quoter.Quote(tableName)), false
 }
 
-func (db *dameng) CreateTableSQL(table *schemas.Table, tableName string) ([]string, bool) {
+// SeqName returns sequence name for some table
+func SeqName(tableName string) string {
+	return "SEQ_" + strings.ToUpper(tableName)
+}
+
+func (db *dameng) CreateTableSQL(ctx context.Context, queryer core.Queryer, table *schemas.Table, tableName string) ([]string, bool, error) {
 	if tableName == "" {
 		tableName = table.Name
 	}
@@ -645,7 +653,38 @@ func (db *dameng) CreateTableSQL(table *schemas.Table, tableName string) ([]stri
 	}
 	b.WriteString(")")
 
-	return []string{b.String()}, false
+	var seqName = SeqName(tableName)
+	if table.AutoIncrColumn() != nil {
+		var cnt int
+		rows, err := queryer.QueryContext(ctx, "SELECT COUNT(*) FROM user_sequences WHERE sequence_name = ?", seqName)
+		if err != nil {
+			return nil, false, err
+		}
+		defer rows.Close()
+		if !rows.Next() {
+			if rows.Err() != nil {
+				return nil, false, rows.Err()
+			}
+			return nil, false, errors.New("query sequence failed")
+		}
+
+		if err := rows.Scan(&cnt); err != nil {
+			return nil, false, err
+		}
+
+		if cnt == 0 {
+			var sql2 = fmt.Sprintf(`CREATE sequence %s 
+			minvalue 1
+       		nomaxvalue
+       		start with 1
+       		increment by 1
+       		nocycle
+			nocache`, seqName)
+			return []string{b.String(), sql2}, false, nil
+		}
+	}
+
+	return []string{b.String()}, false, nil
 }
 
 func (db *dameng) SetQuotePolicy(quotePolicy QuotePolicy) {
@@ -826,13 +865,13 @@ func (db *dameng) GetColumns(queryer core.Queryer, ctx context.Context, tableNam
 
 		switch dt {
 		case "VARCHAR2":
+			col.SQLType = schemas.SQLType{Name: "VARCHAR2", DefaultLength: len1, DefaultLength2: len2}
+		case "VARCHAR":
 			col.SQLType = schemas.SQLType{Name: schemas.Varchar, DefaultLength: len1, DefaultLength2: len2}
-		case "NVARCHAR2":
-			col.SQLType = schemas.SQLType{Name: schemas.NVarchar, DefaultLength: len1, DefaultLength2: len2}
 		case "TIMESTAMP WITH TIME ZONE":
 			col.SQLType = schemas.SQLType{Name: schemas.TimeStampz, DefaultLength: 0, DefaultLength2: 0}
 		case "NUMBER":
-			col.SQLType = schemas.SQLType{Name: schemas.Double, DefaultLength: len1, DefaultLength2: len2}
+			col.SQLType = schemas.SQLType{Name: "NUMBER", DefaultLength: len1, DefaultLength2: len2}
 		case "LONG", "LONG RAW", "NCLOB", "CLOB":
 			col.SQLType = schemas.SQLType{Name: schemas.Text, DefaultLength: 0, DefaultLength2: 0}
 		case "RAW":
@@ -959,7 +998,7 @@ type damengDriver struct {
 // Features return features
 func (p *damengDriver) Features() *DriverFeatures {
 	return &DriverFeatures{
-		SupportReturnInsertedID: true,
+		SupportReturnInsertedID: false,
 	}
 }
 
diff --git a/dialects/dialect.go b/dialects/dialect.go
index b6c0853a..49198a70 100644
--- a/dialects/dialect.go
+++ b/dialects/dialect.go
@@ -61,7 +61,7 @@ type Dialect interface {
 
 	GetTables(queryer core.Queryer, ctx context.Context) ([]*schemas.Table, error)
 	IsTableExist(queryer core.Queryer, ctx context.Context, tableName string) (bool, error)
-	CreateTableSQL(table *schemas.Table, tableName string) ([]string, bool)
+	CreateTableSQL(ctx context.Context, queryer core.Queryer, table *schemas.Table, tableName string) ([]string, bool, error)
 	DropTableSQL(tableName string) (string, bool)
 
 	GetColumns(queryer core.Queryer, ctx context.Context, tableName string) ([]string, map[string]*schemas.Column, error)
@@ -285,43 +285,35 @@ func ColumnString(dialect Dialect, col *schemas.Column, includePrimaryKey bool)
 		return "", err
 	}
 
-	if err := bd.WriteByte(' '); err != nil {
-		return "", err
-	}
-
 	if includePrimaryKey && col.IsPrimaryKey {
-		if _, err := bd.WriteString("PRIMARY KEY "); err != nil {
+		if _, err := bd.WriteString(" PRIMARY KEY"); err != nil {
 			return "", err
 		}
-
 		if col.IsAutoIncrement {
-			if _, err := bd.WriteString(dialect.AutoIncrStr()); err != nil {
+			if err := bd.WriteByte(' '); err != nil {
 				return "", err
 			}
-			if err := bd.WriteByte(' '); err != nil {
+			if _, err := bd.WriteString(dialect.AutoIncrStr()); err != nil {
 				return "", err
 			}
 		}
 	}
 
 	if col.Default != "" {
-		if _, err := bd.WriteString("DEFAULT "); err != nil {
+		if _, err := bd.WriteString(" DEFAULT "); err != nil {
 			return "", err
 		}
 		if _, err := bd.WriteString(col.Default); err != nil {
 			return "", err
 		}
-		if err := bd.WriteByte(' '); err != nil {
-			return "", err
-		}
 	}
 
 	if col.Nullable {
-		if _, err := bd.WriteString("NULL "); err != nil {
+		if _, err := bd.WriteString(" NULL"); err != nil {
 			return "", err
 		}
 	} else {
-		if _, err := bd.WriteString("NOT NULL "); err != nil {
+		if _, err := bd.WriteString(" NOT NULL"); err != nil {
 			return "", err
 		}
 	}
diff --git a/dialects/mysql.go b/dialects/mysql.go
index 0489904a..5cf9ffc9 100644
--- a/dialects/mysql.go
+++ b/dialects/mysql.go
@@ -678,7 +678,11 @@ func (db *mysql) CreateTableSQL(table *schemas.Table, tableName string) ([]strin
 		b.WriteString(" ROW_FORMAT=")
 		b.WriteString(db.rowFormat)
 	}
+<<<<<<< HEAD
 	return []string{b.String()}, true
+=======
+	return []string{sql}, true, nil
+>>>>>>> 4dbe145 (fix insert)
 }
 
 func (db *mysql) Filters() []Filter {
diff --git a/dialects/oracle.go b/dialects/oracle.go
index 11a6653b..e3188df9 100644
--- a/dialects/oracle.go
+++ b/dialects/oracle.go
@@ -599,7 +599,7 @@ func (db *oracle) DropTableSQL(tableName string) (string, bool) {
 	return fmt.Sprintf("DROP TABLE `%s`", tableName), false
 }
 
-func (db *oracle) CreateTableSQL(table *schemas.Table, tableName string) ([]string, bool) {
+func (db *oracle) CreateTableSQL(ctx context.Context, queryer core.Queryer, table *schemas.Table, tableName string) ([]string, bool, error) {
 	var sql = "CREATE TABLE "
 	if tableName == "" {
 		tableName = table.Name
@@ -629,7 +629,7 @@ func (db *oracle) CreateTableSQL(table *schemas.Table, tableName string) ([]stri
 	}
 
 	sql = sql[:len(sql)-2] + ")"
-	return []string{sql}, false
+	return []string{sql}, false, nil
 }
 
 func (db *oracle) SetQuotePolicy(quotePolicy QuotePolicy) {
diff --git a/engine.go b/engine.go
index 8937d0a1..ca258185 100644
--- a/engine.go
+++ b/engine.go
@@ -436,7 +436,7 @@ func (engine *Engine) DumpTablesToFile(tables []*schemas.Table, fp string, tp ..
 
 // DumpTables dump specify tables to io.Writer
 func (engine *Engine) DumpTables(tables []*schemas.Table, w io.Writer, tp ...schemas.DBType) error {
-	return engine.dumpTables(tables, w, tp...)
+	return engine.dumpTables(context.Background(), tables, w, tp...)
 }
 
 func formatBool(s string, dstDialect dialects.Dialect) string {
@@ -452,7 +452,7 @@ func formatBool(s string, dstDialect dialects.Dialect) string {
 }
 
 // dumpTables dump database all table structs and data to w with specify db type
-func (engine *Engine) dumpTables(tables []*schemas.Table, w io.Writer, tp ...schemas.DBType) error {
+func (engine *Engine) dumpTables(ctx context.Context, tables []*schemas.Table, w io.Writer, tp ...schemas.DBType) error {
 	var dstDialect dialects.Dialect
 	if len(tp) == 0 {
 		dstDialect = engine.dialect
@@ -504,7 +504,10 @@ func (engine *Engine) dumpTables(tables []*schemas.Table, w io.Writer, tp ...sch
 			}
 		}
 
-		sqls, _ := dstDialect.CreateTableSQL(dstTable, dstTableName)
+		sqls, _, err := dstDialect.CreateTableSQL(ctx, engine.db, dstTable, dstTableName)
+		if err != nil {
+			return err
+		}
 		for _, s := range sqls {
 			_, err = io.WriteString(w, s+";\n")
 			if err != nil {
diff --git a/integrations/cache_test.go b/integrations/cache_test.go
index e07d7e21..80cd45e8 100644
--- a/integrations/cache_test.go
+++ b/integrations/cache_test.go
@@ -166,14 +166,14 @@ func TestCacheGet(t *testing.T) {
 	assert.NoError(t, err)
 
 	var box1 MailBox3
-	has, err := testEngine.Where("id = ?", inserts[0].Id).Get(&box1)
+	has, err := testEngine.Where(testEngine.Quote("id")+" = ?", inserts[0].Id).Get(&box1)
 	assert.NoError(t, err)
 	assert.True(t, has)
 	assert.EqualValues(t, "user1", box1.Username)
 	assert.EqualValues(t, "pass1", box1.Password)
 
 	var box2 MailBox3
-	has, err = testEngine.Where("id = ?", inserts[0].Id).Get(&box2)
+	has, err = testEngine.Where(testEngine.Quote("id")+" = ?", inserts[0].Id).Get(&box2)
 	assert.NoError(t, err)
 	assert.True(t, has)
 	assert.EqualValues(t, "user1", box2.Username)
diff --git a/internal/statements/insert.go b/internal/statements/insert.go
index 84547cdf..72b6e36c 100644
--- a/internal/statements/insert.go
+++ b/internal/statements/insert.go
@@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"xorm.io/builder"
+	"xorm.io/xorm/dialects"
 	"xorm.io/xorm/schemas"
 )
 
@@ -42,7 +43,11 @@ func (statement *Statement) GenInsertSQL(colNames []string, args []interface{})
 		return "", nil, err
 	}
 
-	if len(colNames) <= 0 {
+	var hasInsertColumns = len(colNames) > 0
+	var needSeq = len(table.AutoIncrement) > 0 && (statement.dialect.URI().DBType == schemas.ORACLE || statement.dialect.URI().DBType == schemas.DAMENG)
+
+	if !hasInsertColumns && statement.dialect.URI().DBType != schemas.ORACLE &&
+		statement.dialect.URI().DBType != schemas.DAMENG {
 		if statement.dialect.URI().DBType == schemas.MYSQL {
 			if _, err := buf.WriteString(" VALUES ()"); err != nil {
 				return "", nil, err
@@ -60,6 +65,10 @@ func (statement *Statement) GenInsertSQL(colNames []string, args []interface{})
 			return "", nil, err
 		}
 
+		if needSeq {
+			colNames = append(colNames, table.AutoIncrement)
+		}
+
 		if err := statement.dialect.Quoter().JoinWrite(buf.Builder, append(colNames, exprs.ColNames()...), ","); err != nil {
 			return "", nil, err
 		}
@@ -113,6 +122,18 @@ func (statement *Statement) GenInsertSQL(colNames []string, args []interface{})
 				return "", nil, err
 			}
 
+			// Insert tablename (id) Values(seq_tablename.nextval)
+			if needSeq {
+				if hasInsertColumns {
+					if _, err := buf.WriteString(","); err != nil {
+						return "", nil, err
+					}
+				}
+				if _, err := buf.WriteString(dialects.SeqName(tableName) + ".nextval"); err != nil {
+					return "", nil, err
+				}
+			}
+
 			if len(exprs) > 0 {
 				if _, err := buf.WriteString(","); err != nil {
 					return "", nil, err
diff --git a/internal/statements/statement.go b/internal/statements/statement.go
index 1fcc0bba..5be46ef9 100644
--- a/internal/statements/statement.go
+++ b/internal/statements/statement.go
@@ -642,14 +642,6 @@ func (statement *Statement) genColumnStr() string {
 	return buf.String()
 }
 
-// GenCreateTableSQL generated create table SQL
-func (statement *Statement) GenCreateTableSQL() []string {
-	statement.RefTable.StoreEngine = statement.StoreEngine
-	statement.RefTable.Charset = statement.Charset
-	s, _ := statement.dialect.CreateTableSQL(statement.RefTable, statement.TableName())
-	return s
-}
-
 // GenIndexSQL generated create index SQL
 func (statement *Statement) GenIndexSQL() []string {
 	var sqls []string
diff --git a/schemas/type.go b/schemas/type.go
index be25230d..d192bac6 100644
--- a/schemas/type.go
+++ b/schemas/type.go
@@ -106,12 +106,14 @@ var (
 	Integer           = "INTEGER"
 	BigInt            = "BIGINT"
 	UnsignedBigInt    = "UNSIGNED BIGINT"
+	Number            = "NUMBER"
 
 	Enum = "ENUM"
 	Set  = "SET"
 
 	Char             = "CHAR"
 	Varchar          = "VARCHAR"
+	VARCHAR2         = "VARCHAR2"
 	NChar            = "NCHAR"
 	NVarchar         = "NVARCHAR"
 	TinyText         = "TINYTEXT"
@@ -175,6 +177,7 @@ var (
 		Integer:           NUMERIC_TYPE,
 		BigInt:            NUMERIC_TYPE,
 		UnsignedBigInt:    NUMERIC_TYPE,
+		Number:            NUMERIC_TYPE,
 
 		Enum:  TEXT_TYPE,
 		Set:   TEXT_TYPE,
@@ -186,6 +189,7 @@ var (
 		Char:       TEXT_TYPE,
 		NChar:      TEXT_TYPE,
 		Varchar:    TEXT_TYPE,
+		VARCHAR2:   TEXT_TYPE,
 		NVarchar:   TEXT_TYPE,
 		TinyText:   TEXT_TYPE,
 		Text:       TEXT_TYPE,
diff --git a/session_insert.go b/session_insert.go
index a8f365c7..09873b68 100644
--- a/session_insert.go
+++ b/session_insert.go
@@ -307,16 +307,39 @@ func (session *Session) insertStruct(bean interface{}) (int64, error) {
 
 	// if there is auto increment column and driver don't support return it
 	if len(table.AutoIncrement) > 0 && !session.engine.driver.Features().SupportReturnInsertedID {
-		var sql = sqlStr
-		if session.engine.dialect.URI().DBType == schemas.ORACLE {
-			sql = "select seq_atable.currval from dual"
+		var sql string
+		var newArgs []interface{}
+		var needCommit bool
+		if session.engine.dialect.URI().DBType == schemas.ORACLE || session.engine.dialect.URI().DBType == schemas.DAMENG {
+			if session.isAutoCommit { // if it's not in transaction
+				if err := session.Begin(); err != nil {
+					return 0, err
+				}
+				needCommit = true
+			}
+			_, err := session.exec(sqlStr, args...)
+			if err != nil {
+				return 0, err
+			}
+			sql = fmt.Sprintf("select %s.currval from dual", dialects.SeqName(tableName))
+		} else {
+			sql = sqlStr
+			newArgs = args
 		}
 
-		rows, err := session.queryRows(sql, args...)
+		var id int64
+		err := session.queryRow(sql, newArgs...).Scan(&id)
 		if err != nil {
 			return 0, err
 		}
-		defer rows.Close()
+		if needCommit {
+			if err := session.Commit(); err != nil {
+				return 0, err
+			}
+		}
+		if id == 0 {
+			return 0, errors.New("insert successfully but not returned id")
+		}
 
 		defer handleAfterInsertProcessorFunc(bean)
 
@@ -331,16 +354,6 @@ func (session *Session) insertStruct(bean interface{}) (int64, error) {
 			}
 		}
 
-		var id int64
-		if !rows.Next() {
-			if rows.Err() != nil {
-				return 0, rows.Err()
-			}
-			return 0, errors.New("insert successfully but not returned id")
-		}
-		if err := rows.Scan(&id); err != nil {
-			return 1, err
-		}
 		aiValue, err := table.AutoIncrColumn().ValueOf(bean)
 		if err != nil {
 			session.engine.logger.Errorf("%v", err)
diff --git a/session_schema.go b/session_schema.go
index 2e64350f..7bbe75f8 100644
--- a/session_schema.go
+++ b/session_schema.go
@@ -6,6 +6,7 @@ package xorm
 
 import (
 	"bufio"
+	"context"
 	"database/sql"
 	"fmt"
 	"io"
@@ -40,7 +41,13 @@ func (session *Session) createTable(bean interface{}) error {
 		return err
 	}
 
-	sqlStrs := session.statement.GenCreateTableSQL()
+	session.statement.RefTable.StoreEngine = session.statement.StoreEngine
+	session.statement.RefTable.Charset = session.statement.Charset
+	sqlStrs, _, err := session.engine.dialect.CreateTableSQL(context.Background(), session.engine.db, session.statement.RefTable, session.statement.TableName())
+	if err != nil {
+		return err
+	}
+
 	for _, s := range sqlStrs {
 		_, err := session.exec(s)
 		if err != nil {