cakephp saveField 用法

function testa(){
     $this->autoRender = false;
     $this->Operator->id = 212;
     $result =$this->Operator->saveField('name','55浪');   //不能以数组的形式来保存啊.

     if($result){
      echo "sucessful==================================";
     }
                              
     echo "<pre>";
    // print_r($result);
     echo "</pre>";
     
    }