Yii框架中memcache使用教程

public function getChargeRank3()
    {
        $startime='2014-04-10 00:00:00';
        $endtime='2014-04-30 23:59:59';
        $sql="select top 3 user_id, sum (point) as total from  table where state=5 and cp_id>=11 and cp_id<=19 and pay_time >='$startime' and pay_time<='$endtime'
group by user_id order by total desc";
        $result=  Yii::app()->controller>createCommand($sql)->queryAll();
        $cache = yii::app()->cache->get($key);
        if($cache!=false)
        {
            foreach ($result as $key=>$val)
            {
  内部为赠送礼物代码，不便透漏
            }
        }
        YII::app()->cache->set($key, $result, strtotime($endtime));//把前三名写入缓存
    }