CI框架 模糊查询，链表查询

$data = $this->db->from('flash_news')
    ->select('xx,xx,xx,xx')
    ->limit(2)
    ->like('tags' ,'小兵研究', 'both')
    ->like('tags' ,'孙哥哥', 'both')
    ->like('content' ,'众生药业', 'both')
    ->order_by('news_id','desc')
    ->get()
    ->result_array();
echo $this->db->last_query()

$data = $this->db->from('xx')
    ->join('xx','xx.SECURITYCODE = xx.SECURITYCODE')
    ->select('xx')
    ->where(array(1)
    //->limit(500)
    ->get()
    ->result_array();