Tp5 点击自增 setInc

db('article')->where('id','=',$arid)->setInc('click');

public function index()
    {
        $arid = input('arid');
        $articles = db('article')->find($arid);
        db('article')->where('id','=',$arid)->setInc('click');
        $cates = db('cate')->find($articles['cateid']);
        $this->assign(array(
            'articles'=> $articles,
            'cates' => $cates
        ));
        return $this->fetch();
    }