github.com/astaxie/beego@v1.12.3/orm/db_tidb.go (about)

     1  // Copyright 2015 TiDB Author. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package orm
    16  
    17  import (
    18  	"fmt"
    19  )
    20  
    21  // mysql dbBaser implementation.
    22  type dbBaseTidb struct {
    23  	dbBase
    24  }
    25  
    26  var _ dbBaser = new(dbBaseTidb)
    27  
    28  // get mysql operator.
    29  func (d *dbBaseTidb) OperatorSQL(operator string) string {
    30  	return mysqlOperators[operator]
    31  }
    32  
    33  // get mysql table field types.
    34  func (d *dbBaseTidb) DbTypes() map[string]string {
    35  	return mysqlTypes
    36  }
    37  
    38  // show table sql for mysql.
    39  func (d *dbBaseTidb) ShowTablesQuery() string {
    40  	return "SELECT table_name FROM information_schema.tables WHERE table_type = 'BASE TABLE' AND table_schema = DATABASE()"
    41  }
    42  
    43  // show columns sql of table for mysql.
    44  func (d *dbBaseTidb) ShowColumnsQuery(table string) string {
    45  	return fmt.Sprintf("SELECT COLUMN_NAME, COLUMN_TYPE, IS_NULLABLE FROM information_schema.columns "+
    46  		"WHERE table_schema = DATABASE() AND table_name = '%s'", table)
    47  }
    48  
    49  // execute sql to check index exist.
    50  func (d *dbBaseTidb) IndexExists(db dbQuerier, table string, name string) bool {
    51  	row := db.QueryRow("SELECT count(*) FROM information_schema.statistics "+
    52  		"WHERE table_schema = DATABASE() AND table_name = ? AND index_name = ?", table, name)
    53  	var cnt int
    54  	row.Scan(&cnt)
    55  	return cnt > 0
    56  }
    57  
    58  // create new mysql dbBaser.
    59  func newdbBaseTidb() dbBaser {
    60  	b := new(dbBaseTidb)
    61  	b.ins = b
    62  	return b
    63  }