class indexController extends grace{
    //根据缓存情况设置、读取缓存数据
    public function index(){
        $this->cache('test', 12, '__getData');
        p($this->test);
    }
 
        echo '无缓存，进行查询...<br />';
        $db = db('persons');
        $persons = $db->fetchAll();
        return $persons;
    }
 
    //删除指定的缓存
    $this->removeCache('test', '12');
    }
 
    //清空缓存
    public function t2(){
    $this->clearCache();
    }