ThinkPHP里面用原生SQL

public function rewardlog(){
        $adminNav = C('ADMIN_NAV');
        $adminNav[1]['class'] = 'cur';
        $this->assign('adminNav',$adminNav);

        $where = 'And 1=1';
        if($_POST){
            $input = trim($_POST['input']);
            if($input != ''){
            $where = 'AND u.nickname like \'%'.$input.'%\' OR r.message_code like \'%'.$input.'%\' group by r.id';
            }
        }
        $sql ="SELECT r.id,u.nickname,p.pname,r.choosetime,r.message_code,r.gettime FROM `1008_reward` r,`1008_user` u,`1008_prize` p WHERE r.uid = u.id AND r.rid = p.id $where";
        $model = M();
        $list = $model->query($sql);
        $count = count($list);
        $Page       = new Page($count,10);
        $show       = $Page->show();
        $res = $model->query($sql." limit {$Page->firstRow},{$Page->listRows}");
        $this->assign('input',$input);
        $this->assign('res',$res);
        $this->assign('page',$show);
        $this->assign('title','中奖记录');
        $this->display();
    }

1、查询用query   添加与修改用execute