diff --git a/session_insert.go b/session_insert.go
index d4555730..07a63648 100644
--- a/session_insert.go
+++ b/session_insert.go
@@ -311,8 +311,15 @@ func (session *Session) insertStruct(bean interface{}) (int64, error) {
 		var newArgs []interface{}
 		var needCommit bool
 		var id int64
+		var i = utils.IndexSlice(colNames, table.AutoIncrement)
+		if i > -1 {
+			id, err = convert.AsInt64(args[i])
+			if err != nil {
+				return 0, err
+			}
+		}
 		if session.engine.dialect.URI().DBType == schemas.DB2 || session.engine.dialect.URI().DBType == schemas.ORACLE {
-			if session.isAutoCommit { // if it's not in transaction
+			if id == 0 && session.isAutoCommit { // if it's not in transaction
 				if err := session.Begin(); err != nil {
 					return 0, err
 				}
@@ -320,20 +327,16 @@ func (session *Session) insertStruct(bean interface{}) (int64, error) {
 			}
 			_, err := session.exec(sqlStr, args...)
 			if err != nil {
+				if needCommit {
+					session.Rollback()
+				}
 				return 0, err
 			}
-			i := utils.IndexSlice(colNames, table.AutoIncrement)
-			if i > -1 {
-				id, err = convert.AsInt64(args[i])
-				if err != nil {
-					return 0, err
-				}
-			} else {
-				if session.engine.dialect.URI().DBType == schemas.ORACLE {
-					sql = fmt.Sprintf("select %s.currval from dual", utils.SeqName(tableName))
-				} else if session.engine.dialect.URI().DBType == schemas.DB2 {
-					sql = "select IDENTITY_VAL_LOCAL() as id FROM sysibm.sysdummy1"
-				}
+
+			if session.engine.dialect.URI().DBType == schemas.ORACLE {
+				sql = fmt.Sprintf("select %s.currval from dual", utils.SeqName(tableName))
+			} else if session.engine.dialect.URI().DBType == schemas.DB2 {
+				sql = "select IDENTITY_VAL_LOCAL() as id FROM sysibm.sysdummy1"
 			}
 		} else {
 			sql = sqlStr
@@ -343,6 +346,9 @@ func (session *Session) insertStruct(bean interface{}) (int64, error) {
 		if id == 0 {
 			err := session.queryRow(sql, newArgs...).Scan(&id)
 			if err != nil {
+				if needCommit {
+					session.Rollback()
+				}
 				return 0, err
 			}
 			if needCommit {