public function flush_cache()
{
$this->_reset_run(array('qb_cache_select' => array(), 'qb_cache_from' => array(), 'qb_cache_join' => array(), 'qb_cache_where' => array(), 'qb_cache_groupby' => array(), 'qb_cache_having' => array(), 'qb_cache_orderby' => array(), 'qb_cache_set' => array(), 'qb_cache_exists' => array(), 'qb_cache_no_escape' => array()));
return $this;
}