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