thinkphp使用原生语句多表查询

    public function jifenjilu(){
        $Model = new Model();
        $sql = "select m.id,m.token,m.message,m.wecha_id,m.time,u.wechaname from pigcms_member_card_message as m, pigcms_userinfo as u where m.wecha_id=u.wecha_id order by m.id desc";
        $voList = $Model->query($sql);

        //var_dump($voList);
        $this->assign("data", $voList);
        $this->display();

    }