CheckIfBDRModeIsSupported checks if the downstream supports BDR mode.

CheckIsTiDB checks if the downstream is TiDB.

CreateMySQLDBConn creates a mysql database connection with the given dsn.

GenBasicDSN generates a basic DSN from the given config.

GenerateDSN generates the dsn with the given config.

GetTestDB checks and adjusts the password of the given DSN, it will return a DB instance opened with the adjusted password.

MockTestDB creates a mock mysql database connection.

NewConfig returns the default mysql backend config.

QueryMaxAllowedPacket gets the value of max_allowed_packet.

QueryMaxPreparedStmtCount gets the value of max_prepared_stmt_count.

SetWriteSource sets write source for the transaction.

BackoffBaseDelay indicates the base delay time for retrying.

BackoffMaxDelay indicates the max delay time for retrying.

DefaultMaxTxnRow is the default max number of rows in a transaction.

DefaultWorkerCount is the default number of workers.

Config is the configs for MySQL backend.

Factory is the factory for creating db connection.