thinkphp缓存

我这里不给大家说S方法，f方法之间的区别，晚上一大堆，我就直接写一些简单的例子：

S方法：

public function showlist(){
        $goods = D('Goods');
        $value = S('goods');
        //dump($value);
        if(empty($value)){
            $arrgoods = $goods->cache(goods,120)->select();
            //dump($arrgoods);
            echo "数据库数据";
            $this->assign('arr_goods',$arrgoods);
            $this->display();
        }else{
            echo "缓存数据";
            $this->assign('arr_goods',$value);
            $this->display();
        }
    }

F方法：

public function showlist(){
       $roles = D('Role');
       //$role_list =S('roles');
       $role_list =F('roles','',TEMP_PATH);
       //dump($role_list);exit;
       if(empty($role_list)){
           $role_list = $roles->select();
           //S('roles',$role_list,120);
           F('roles',$role_list,TEMP_PATH);
           echo "这是从数据库直接读取的数据";
           $this->assign('roles',$role_list);
       }else{
           echo "这是缓存文件";
           $this->assign('roles',$role_list);
       }
       $this->display();
    }

实例化缓存类：
public function showlist(){
        //dump(get_defined_constants(true));
        $cate = D('brand');
        //实例化缓存类：getInstance('缓存方式','缓存参数'),
        $Cache = Cache::getInstance('File',array('expire'=>'60'));
        $value = $Cache->getOptions('arr_brand');
        //dump($value);
        if(empty($value)){
            $arr_brand = $cate ->order('addtime desc')->select();
            $Cache->setOptions('arr_brand',$arr_brand);
            echo "数据库数据";
            $this->assign('brand',$arr_brand);
        }else{
            echo "缓存数据";
            $this->assign('brand',$value);
        }
        $this->display();
    }