tp3无法select一条数据记录

select 用于找出多组数据

  $config=$this->config_model->limit(1)->order('id asc')->select();
  $this->assign('config',$config);

find用于找一条数据方便取出

  $config=$this->config_model->limit(1)->order('id asc')->find();
  $this->assign('config',$config);