CheckSyncState check if srouceDB and targetDB has the same table and data.

CloseDB close the mysql fd.

CloseDBs close the mysql fd.

CreateDB create a mysql fd.

CreateSinkDB return sink sql.DB for test.

MustExec executes sqls.

MustExecWithConn executes sqls with context.

NewConfig creates a new config.

Config is the configuration.

DBConfig is the DB configuration.