tidb ddl_syncer 源码
tidb ddl_syncer 代码
文件路径：/util/ddl-checker/ddl_syncer.go
// Copyright 2022 PingCAP, Inc.
//
// 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 checker
import (
"context"
"database/sql"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/util/dbutil"
)
// DDLSyncer can sync the table structure from upstream(usually MySQL) to ExecutableChecker
type DDLSyncer struct {
db *sql.DB
ec *ExecutableChecker
}
// NewDDLSyncer create a new DDLSyncer
func NewDDLSyncer(cfg *dbutil.DBConfig, executableChecker *ExecutableChecker) (*DDLSyncer, error) {
db, err := dbutil.OpenDB(*cfg, nil)
if err != nil {
return nil, errors.Trace(err)
}
return &DDLSyncer{db, executableChecker}, nil
}
// SyncTable can sync table structure from upstream by table name
func (ds *DDLSyncer) SyncTable(tidbContext context.Context, schemaName string, tableName string) error {
createTableSQL, err := dbutil.GetCreateTableSQL(context.Background(), ds.db, schemaName, tableName)
if err != nil {
return errors.Trace(err)
}
err = ds.ec.DropTable(tidbContext, tableName)
if err != nil {
return errors.Trace(err)
}
err = ds.ec.Execute(tidbContext, createTableSQL)
if err != nil {
return errors.Trace(err)
}
return nil
}
// Close the DDLSyncer, if the ExecutableChecker in DDLSyncer is open, it will be closed, too
func (ds *DDLSyncer) Close() error {
err1 := ds.ec.Close()
err2 := dbutil.CloseDB(ds.db)
if err1 != nil {
return errors.Trace(err1)
}
if err2 != nil {
return errors.Trace(err2)
}
return nil
}
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