function createSavepoint(string $identifier): \React\Promise\PromiseInterface {
        return $this->query('SAVEPOINT '.$this->quote($identifier));
    }
function createSavepoint(string $identifier): \React\Promise\PromiseInterface {
        return $this->query('SAVEPOINT '.$this->quote($identifier));
    }
function createSavepoint ( string $ identifier ) : \ React \ Promise \ PromiseInterface { return $ this -> query ( 'SAVEPOINT ' . $ this -> quote ( $ identifier ) ) ; }
Creates a savepoint with the given identifier.
@param string  $identifier
@return \React\Promise\PromiseInterface
@throws \Plasma\TransactionException  Thrown if the transaction has been committed or rolled back.
Creates a savepoint with the given identifier .