/**
  * 删除
  *
  * @return void
  */
 public function delete($id)
 {
     /** 验证 */
     if (empty($id)) {
         message('参数错误!');
     }
     /* 解除评分标准和考试期次的关联 */
     $this->db->trans_begin();
     $delete_relationship = EvaluationStandardExamModel::delete($id);
     $result = EvaluationStandardModel::recycle($id);
     if ($this->db->trans_status() === FALSE) {
         $this->db->trans_rollback();
     } else {
         $this->db->trans_commit();
     }
     if ($result && $delete_relationship) {
         message('评分标准删除成功', 'admin/evaluation_standard/index');
     } else {
         message('评分标准删除失败!请重新尝试!', 'admin/evaluation_standard/index');
     }
 }