Improve dialect interface (#1579)

Fix bug

Improve dialect interface

Reviewed-on: https://gitea.com/xorm/xorm/pulls/1579

dialects/dialect.go

@@ -43,8 +43,6 @@ type Dialect interface {
 	SetQuotePolicy(quotePolicy QuotePolicy)
 
 	AutoIncrStr() string
-	SupportInsertMany() bool
-	SupportDropIfExists() bool
 
 	GetIndexes(ctx context.Context, tableName string) (map[string]*schemas.Index, error)
 	IndexCheckSQL(tableName, idxName string) (string, []interface{})
@@ -52,9 +50,9 @@ type Dialect interface {
 	DropIndexSQL(tableName string, index *schemas.Index) string
 
 	GetTables(ctx context.Context) ([]*schemas.Table, error)
-	TableCheckSQL(tableName string) (string, []interface{})
+	IsTableExist(ctx context.Context, tableName string) (bool, error)
-	CreateTableSQL(table *schemas.Table, tableName string) string
+	CreateTableSQL(table *schemas.Table, tableName string) (string, bool)
-	DropTableSQL(tableName string) string
+	DropTableSQL(tableName string) (string, bool)
 
 	GetColumns(ctx context.Context, tableName string) ([]string, map[string]*schemas.Column, error)
 	IsColumnExist(ctx context.Context, tableName string, colName string) (bool, error)
@@ -149,13 +147,9 @@ func (b *Base) FormatBytes(bs []byte) string {
 	return fmt.Sprintf("0x%x", bs)
 }
 
-func (db *Base) SupportDropIfExists() bool {
+func (db *Base) DropTableSQL(tableName string) (string, bool) {
-	return true
-}
-
-func (db *Base) DropTableSQL(tableName string) string {
 	quote := db.dialect.Quoter().Quote
-	return fmt.Sprintf("DROP TABLE IF EXISTS %s", quote(tableName))
+	return fmt.Sprintf("DROP TABLE IF EXISTS %s", quote(tableName)), true
 }
 
 func (db *Base) HasRecords(ctx context.Context, query string, args ...interface{}) (bool, error) {

dialects/mssql.go

@@ -281,10 +281,6 @@ func (db *mssql) SQLType(c *schemas.Column) string {
 	return res
 }
 
-func (db *mssql) SupportInsertMany() bool {
-	return true
-}
-
 func (db *mssql) IsReserved(name string) bool {
 	_, ok := mssqlReservedWords[strings.ToUpper(name)]
 	return ok
@@ -311,10 +307,10 @@ func (db *mssql) AutoIncrStr() string {
 	return "IDENTITY"
 }
 
-func (db *mssql) DropTableSQL(tableName string) string {
+func (db *mssql) DropTableSQL(tableName string) (string, bool) {
 	return fmt.Sprintf("IF EXISTS (SELECT * FROM sysobjects WHERE id = "+
 		"object_id(N'%s') and OBJECTPROPERTY(id, N'IsUserTable') = 1) "+
-		"DROP TABLE \"%s\"", tableName, tableName)
+		"DROP TABLE \"%s\"", tableName, tableName), true
 }
 
 func (db *mssql) IndexCheckSQL(tableName, idxName string) (string, []interface{}) {
@@ -329,10 +325,9 @@ func (db *mssql) IsColumnExist(ctx context.Context, tableName, colName string) (
 	return db.HasRecords(ctx, query, tableName, colName)
 }
 
-func (db *mssql) TableCheckSQL(tableName string) (string, []interface{}) {
+func (db *mssql) IsTableExist(ctx context.Context, tableName string) (bool, error) {
-	args := []interface{}{}
 	sql := "select * from sysobjects where id = object_id(N'" + tableName + "') and OBJECTPROPERTY(id, N'IsUserTable') = 1"
-	return sql, args
+	return db.HasRecords(ctx, sql)
 }
 
 func (db *mssql) GetColumns(ctx context.Context, tableName string) ([]string, map[string]*schemas.Column, error) {
@@ -491,7 +486,7 @@ WHERE IXS.TYPE_DESC='NONCLUSTERED' and OBJECT_NAME(IXS.OBJECT_ID) =?
 	return indexes, nil
 }
 
-func (db *mssql) CreateTableSQL(table *schemas.Table, tableName string) string {
+func (db *mssql) CreateTableSQL(table *schemas.Table, tableName string) (string, bool) {
 	var sql string
 	if tableName == "" {
 		tableName = table.Name
@@ -522,7 +517,7 @@ func (db *mssql) CreateTableSQL(table *schemas.Table, tableName string) string {
 
 	sql = sql[:len(sql)-2] + ")"
 	sql += ";"
-	return sql
+	return sql, true
 }
 
 func (db *mssql) ForUpdateSQL(query string) string {

dialects/mysql.go

@@ -270,10 +270,6 @@ func (db *mysql) SQLType(c *schemas.Column) string {
 	return res
 }
 
-func (db *mysql) SupportInsertMany() bool {
-	return true
-}
-
 func (db *mysql) IsReserved(name string) bool {
 	_, ok := mysqlReservedWords[strings.ToUpper(name)]
 	return ok
@@ -290,10 +286,9 @@ func (db *mysql) IndexCheckSQL(tableName, idxName string) (string, []interface{}
 	return sql, args
 }
 
-func (db *mysql) TableCheckSQL(tableName string) (string, []interface{}) {
+func (db *mysql) IsTableExist(ctx context.Context, tableName string) (bool, error) {
-	args := []interface{}{db.uri.DBName, tableName}
 	sql := "SELECT `TABLE_NAME` from `INFORMATION_SCHEMA`.`TABLES` WHERE `TABLE_SCHEMA`=? and `TABLE_NAME`=?"
-	return sql, args
+	return db.HasRecords(ctx, sql, db.uri.DBName, tableName)
 }
 
 func (db *mysql) AddColumnSQL(tableName string, col *schemas.Column) string {
@@ -512,7 +507,7 @@ func (db *mysql) GetIndexes(ctx context.Context, tableName string) (map[string]*
 	return indexes, nil
 }
 
-func (db *mysql) CreateTableSQL(table *schemas.Table, tableName string) string {
+func (db *mysql) CreateTableSQL(table *schemas.Table, tableName string) (string, bool) {
 	var sql = "CREATE TABLE IF NOT EXISTS "
 	if tableName == "" {
 		tableName = table.Name
@@ -565,7 +560,7 @@ func (db *mysql) CreateTableSQL(table *schemas.Table, tableName string) string {
 	if db.rowFormat != "" {
 		sql += " ROW_FORMAT=" + db.rowFormat
 	}
-	return sql
+	return sql, true
 }
 
 func (db *mysql) Filters() []Filter {

dialects/oracle.go

@@ -547,24 +547,16 @@ func (db *oracle) AutoIncrStr() string {
 	return "AUTO_INCREMENT"
 }
 
-func (db *oracle) SupportInsertMany() bool {
-	return true
-}
-
 func (db *oracle) IsReserved(name string) bool {
 	_, ok := oracleReservedWords[strings.ToUpper(name)]
 	return ok
 }
 
-func (db *oracle) SupportDropIfExists() bool {
+func (db *oracle) DropTableSQL(tableName string) (string, bool) {
-	return false
+	return fmt.Sprintf("DROP TABLE `%s`", tableName), false
 }
 
-func (db *oracle) DropTableSQL(tableName string) string {
+func (db *oracle) CreateTableSQL(table *schemas.Table, tableName string) (string, bool) {
-	return fmt.Sprintf("DROP TABLE `%s`", tableName)
-}
-
-func (db *oracle) CreateTableSQL(table *schemas.Table, tableName string) string {
 	var sql = "CREATE TABLE "
 	if tableName == "" {
 		tableName = table.Name
@@ -593,7 +585,7 @@ func (db *oracle) CreateTableSQL(table *schemas.Table, tableName string) string
 	}
 
 	sql = sql[:len(sql)-2] + ")"
-	return sql
+	return sql, false
 }
 
 func (db *oracle) SetQuotePolicy(quotePolicy QuotePolicy) {
@@ -619,26 +611,15 @@ func (db *oracle) IndexCheckSQL(tableName, idxName string) (string, []interface{
 		`WHERE TABLE_NAME = :1 AND INDEX_NAME = :2`, args
 }
 
-func (db *oracle) TableCheckSQL(tableName string) (string, []interface{}) {
+func (db *oracle) IsTableExist(ctx context.Context, tableName string) (bool, error) {
-	args := []interface{}{tableName}
+	return db.HasRecords(ctx, `SELECT table_name FROM user_tables WHERE table_name = :1`, tableName)
-	return `SELECT table_name FROM user_tables WHERE table_name = :1`, args
 }
 
 func (db *oracle) IsColumnExist(ctx context.Context, tableName, colName string) (bool, error) {
 	args := []interface{}{tableName, colName}
 	query := "SELECT column_name FROM USER_TAB_COLUMNS WHERE table_name = :1" +
 		" AND column_name = :2"
-
+	return db.HasRecords(ctx, query, args...)
-	rows, err := db.DB().QueryContext(ctx, query, args...)
-	if err != nil {
-		return false, err
-	}
-	defer rows.Close()
-
-	if rows.Next() {
-		return true, nil
-	}
-	return false, nil
 }
 
 func (db *oracle) GetColumns(ctx context.Context, tableName string) ([]string, map[string]*schemas.Column, error) {

dialects/postgres.go

@@ -884,10 +884,6 @@ func (db *postgres) SQLType(c *schemas.Column) string {
 	return res
 }
 
-func (db *postgres) SupportInsertMany() bool {
-	return true
-}
-
 func (db *postgres) IsReserved(name string) bool {
 	_, ok := postgresReservedWords[strings.ToUpper(name)]
 	return ok
@@ -897,7 +893,7 @@ func (db *postgres) AutoIncrStr() string {
 	return ""
 }
 
-func (db *postgres) CreateTableSQL(table *schemas.Table, tableName string) string {
+func (db *postgres) CreateTableSQL(table *schemas.Table, tableName string) (string, bool) {
 	var sql string
 	sql = "CREATE TABLE IF NOT EXISTS "
 	if tableName == "" {
@@ -932,7 +928,7 @@ func (db *postgres) CreateTableSQL(table *schemas.Table, tableName string) strin
 	}
 	sql += ")"
 
-	return sql
+	return sql, true
 }
 
 func (db *postgres) IndexCheckSQL(tableName, idxName string) (string, []interface{}) {
@@ -946,14 +942,13 @@ func (db *postgres) IndexCheckSQL(tableName, idxName string) (string, []interfac
 		`WHERE schemaname = ? AND tablename = ? AND indexname = ?`, args
 }
 
-func (db *postgres) TableCheckSQL(tableName string) (string, []interface{}) {
+func (db *postgres) IsTableExist(ctx context.Context, tableName string) (bool, error) {
 	if len(db.uri.Schema) == 0 {
-		args := []interface{}{tableName}
+		return db.HasRecords(ctx, `SELECT tablename FROM pg_tables WHERE tablename = $1`, tableName)
-		return `SELECT tablename FROM pg_tables WHERE tablename = ?`, args
 	}
 
-	args := []interface{}{db.uri.Schema, tableName}
+	return db.HasRecords(ctx, `SELECT tablename FROM pg_tables WHERE schemaname = $1 AND tablename = $2`,
-	return `SELECT tablename FROM pg_tables WHERE schemaname = ? AND tablename = ?`, args
+		db.uri.Schema, tableName)
 }
 
 func (db *postgres) ModifyColumnSQL(tableName string, col *schemas.Column) string {

dialects/sqlite3.go

@@ -211,10 +211,6 @@ func (db *sqlite3) FormatBytes(bs []byte) string {
 	return fmt.Sprintf("X'%x'", bs)
 }
 
-func (db *sqlite3) SupportInsertMany() bool {
-	return true
-}
-
 func (db *sqlite3) IsReserved(name string) bool {
 	_, ok := sqlite3ReservedWords[strings.ToUpper(name)]
 	return ok
@@ -229,9 +225,8 @@ func (db *sqlite3) IndexCheckSQL(tableName, idxName string) (string, []interface
 	return "SELECT name FROM sqlite_master WHERE type='index' and name = ?", args
 }
 
-func (db *sqlite3) TableCheckSQL(tableName string) (string, []interface{}) {
+func (db *sqlite3) IsTableExist(ctx context.Context, tableName string) (bool, error) {
-	args := []interface{}{tableName}
+	return db.HasRecords(ctx, "SELECT name FROM sqlite_master WHERE type='table' and name = ?", tableName)
-	return "SELECT name FROM sqlite_master WHERE type='table' and name = ?", args
 }
 
 func (db *sqlite3) DropIndexSQL(tableName string, index *schemas.Index) string {
@@ -249,7 +244,7 @@ func (db *sqlite3) DropIndexSQL(tableName string, index *schemas.Index) string {
 	return fmt.Sprintf("DROP INDEX %v", db.Quoter().Quote(idxName))
 }
 
-func (db *sqlite3) CreateTableSQL(table *schemas.Table, tableName string) string {
+func (db *sqlite3) CreateTableSQL(table *schemas.Table, tableName string) (string, bool) {
 	var sql string
 	sql = "CREATE TABLE IF NOT EXISTS "
 	if tableName == "" {
@@ -284,7 +279,7 @@ func (db *sqlite3) CreateTableSQL(table *schemas.Table, tableName string) string
 	}
 	sql += ")"
 
-	return sql
+	return sql, true
 }
 
 func (db *sqlite3) ForUpdateSQL(query string) string {

engine.go

@@ -125,14 +125,6 @@ func (engine *Engine) SetColumnMapper(mapper names.Mapper) {
 	engine.tagParser.SetColumnMapper(mapper)
 }
 
-// SupportInsertMany If engine's database support batch insert records like
-// "insert into user values (name, age), (name, age)".
-// When the return is ture, then engine.Insert(&users) will
-// generate batch sql and exeute.
-func (engine *Engine) SupportInsertMany() bool {
-	return engine.dialect.SupportInsertMany()
-}
-
 // Quote Use QuoteStr quote the string sql
 func (engine *Engine) Quote(value string) string {
 	value = strings.TrimSpace(value)
@@ -388,7 +380,8 @@ func (engine *Engine) dumpTables(tables []*schemas.Table, w io.Writer, tp ...sch
 				return err
 			}
 		}
-		_, err = io.WriteString(w, dialect.CreateTableSQL(table, "")+";\n")
+		s, _ := dialect.CreateTableSQL(table, "")
+		_, err = io.WriteString(w, s+";\n")
 		if err != nil {
 			return err
 		}

internal/statements/statement.go

@@ -643,7 +643,8 @@ func (statement *Statement) genColumnStr() string {
 func (statement *Statement) GenCreateTableSQL() string {
 	statement.RefTable.StoreEngine = statement.StoreEngine
 	statement.RefTable.Charset = statement.Charset
-	return statement.dialect.CreateTableSQL(statement.RefTable, statement.TableName())
+	s, _ := statement.dialect.CreateTableSQL(statement.RefTable, statement.TableName())
+	return s
 }
 
 func (statement *Statement) GenIndexSQL() []string {

session_insert.go

@@ -75,21 +75,11 @@ func (session *Session) Insert(beans ...interface{}) (int64, error) {
 					return 0, ErrNoElementsOnSlice
 				}
 
-				if session.engine.SupportInsertMany() {
 				cnt, err := session.innerInsertMulti(bean)
 				if err != nil {
 					return affected, err
 				}
 				affected += cnt
-				} else {
-					for i := 0; i < size; i++ {
-						cnt, err := session.innerInsert(sliceValue.Index(i).Interface())
-						if err != nil {
-							return affected, err
-						}
-						affected += cnt
-					}
-				}
 			} else {
 				cnt, err := session.innerInsert(bean)
 				if err != nil {

session_schema.go

@@ -124,18 +124,16 @@ func (session *Session) DropTable(beanOrTableName interface{}) error {
 
 func (session *Session) dropTable(beanOrTableName interface{}) error {
 	tableName := session.engine.TableName(beanOrTableName)
-	var needDrop = true
+	sqlStr, checkIfExist := session.engine.dialect.DropTableSQL(session.engine.TableName(tableName, true))
-	if !session.engine.dialect.SupportDropIfExists() {
+	if !checkIfExist {
-		sqlStr, args := session.engine.dialect.TableCheckSQL(tableName)
+		exist, err := session.engine.dialect.IsTableExist(session.ctx, tableName)
-		results, err := session.queryBytes(sqlStr, args...)
 		if err != nil {
 			return err
 		}
-		needDrop = len(results) > 0
+		checkIfExist = exist
 	}
 
-	if needDrop {
+	if checkIfExist {
-		sqlStr := session.engine.Dialect().DropTableSQL(session.engine.TableName(tableName, true))
 		_, err := session.exec(sqlStr)
 		return err
 	}
@@ -154,9 +152,7 @@ func (session *Session) IsTableExist(beanOrTableName interface{}) (bool, error)
 }
 
 func (session *Session) isTableExist(tableName string) (bool, error) {
-	sqlStr, args := session.engine.dialect.TableCheckSQL(tableName)
+	return session.engine.dialect.IsTableExist(session.ctx, tableName)
-	results, err := session.queryBytes(sqlStr, args...)
-	return len(results) > 0, err
 }
 
 // IsTableEmpty if table have any records