Orm: Support TiDB

orm/db_tidb.go

@@ -0,0 +1,63 @@
+// Copyright 2015 TiDB Author. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package orm
+
+import (
+	"fmt"
+)
+
+// mysql dbBaser implementation.
+type dbBaseTidb struct {
+	dbBase
+}
+
+var _ dbBaser = new(dbBaseTidb)
+
+// get mysql operator.
+func (d *dbBaseTidb) OperatorSQL(operator string) string {
+	return mysqlOperators[operator]
+}
+
+// get mysql table field types.
+func (d *dbBaseTidb) DbTypes() map[string]string {
+	return mysqlTypes
+}
+
+// show table sql for mysql.
+func (d *dbBaseTidb) ShowTablesQuery() string {
+	return "SELECT table_name FROM information_schema.tables WHERE table_type = 'BASE TABLE' AND table_schema = DATABASE()"
+}
+
+// show columns sql of table for mysql.
+func (d *dbBaseTidb) ShowColumnsQuery(table string) string {
+	return fmt.Sprintf("SELECT COLUMN_NAME, COLUMN_TYPE, IS_NULLABLE FROM information_schema.columns "+
+		"WHERE table_schema = DATABASE() AND table_name = '%s'", table)
+}
+
+// execute sql to check index exist.
+func (d *dbBaseTidb) IndexExists(db dbQuerier, table string, name string) bool {
+	row := db.QueryRow("SELECT count(*) FROM information_schema.statistics "+
+		"WHERE table_schema = DATABASE() AND table_name = ? AND index_name = ?", table, name)
+	var cnt int
+	row.Scan(&cnt)
+	return cnt > 0
+}
+
+// create new mysql dbBaser.
+func newdbBaseTidb() dbBaser {
+	b := new(dbBaseTidb)
+	b.ins = b
+	return b
+}