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Beego/orm/db_tidb.go

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2015-09-10 08:31:53 +00:00
// 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
}