What are the types of redis operations?

1. Delete redis

 $Ranking = $this->Redis->_delete('lianmengname');

2. Read readis cache

 $Ranking = $this->Redis->_get('lianmengname');

3. Save redis

if(empty($Ranking)){
      $Ranking = $this->DoubleAct->selectRanking();
      $this->Redis->_set('lianmengname',json_encode($Ranking),1800);//缓存半小时
    }

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