private function reset()
    {
        $this->settings['columns'] = null;
        $this->settings['table'] = null;
        $this->settings['where'] = null;
        $this->settings['order'] = null;
        $this->settings['limit'] = null;
        $this->settings['statements'] = null;
        $this->settings['foreing'] = null;
        $this->settings['reference'] = null;
        $this->settings['on'] = null;
        $this->settings['actions'] = null;
        $this->settings['engine'] = null;
        $this->settings['charset'] = null;
    }