tp5封装通用的修改某列值

//封装前
public function del($id){
if(empty($id)){
      return $this->error('非法操作！');
    }
    $map['id'] = array('IN' , $id);
    $result = db('table')->where($map)->delete();
    if( $result ) {
      return $this->success('删除成功');
    }
    else {
      return $this->error('删除失败');
    }
}
//封装后
BaseModel
class Base extends \think\Model
{

  protected $param;
  protected $type = array(
    'id'       => 'integer' ,
    'cover_id' => 'integer' ,
  );

  public function initialize()
  {
    parent::initialize();
    $this->param = \think\Request::instance()->param();
  }

  /**
   * 数据修改
   * @return [bool] [是否成功]
   */
  public function change()
  {
    $data = \think\Request::instance()->post();
    if( isset($data['id']) && $data['id'] ) {
      return $this->save($data , array('id' => $data['id']));
    }
    else {
      return $this->save($data);
    }
  }
}