public function rollbackTransaction()
    {
        // Ensure a rollback can be performed
        $success = static::getConn()->supportsTransactions()
            && static::getConn()->transactionDepth();
        if (!$success) {
            return false;
        }
        try {
            // Explicit false = gnostic error from transactionRollback
            if (static::getConn()->transactionRollback() === false) {
                return false;
            }
            return true;
        } catch (DatabaseException $ex) {
            return false;
        }
    }