protected function pushLimit()
    {
        if( null !== $this->limit ) {
            if( null !== $this->offset ) {
                $this->parts[] = 'LIMIT ?, ?';
                $this->params[] = $this->offset;
                $this->params[] = $this->limit;
            } else {
                $this->parts[] = 'LIMIT ?';
                $this->params[] = $this->limit;
            }
        }
    }