DetachedCriteria和Criteria的使用方法

DetachedCriteria和Criteria的使用方法

/*
  * 下载统计
  * @return
  */
 public String downloadStatistics(){
  logger.info("正在执行目录内容统计下载");
  
  String type = getServletRequest().getParameter("type");
  DetachedCriteria dc = DetachedCriteria.forClass(TbXymlb.class)
    .add(Restrictions.and(Restrictions.isNotNull("sfsjtc"), Restrictions.isNotNull("mlnrb")))
    .addOrder(Order.asc("diyu")).addOrder(Order.asc("cydw"));
  
  logger.info("执行查询参数为:{}", type);
  if(DOWNLOAD_TYPE_ZY.equals(type)){
   dc.add(Restrictions.eq("diyu", "99"));
  }else if(DOWNLOAD_TYPE_DF.equals(type)){
   dc.add(Restrictions.ne("diyu", "99"));
  }
  
  // 执行查询
  List<TbXymlb> xymls = xymlService.query(dc);
  
  try{
   
   downloadName = "mlnr_tj.xls";
   downloadFile = buildXLSStream(xymls);
   
  }catch(Exception error){
   logger.error("下载出现错误", error);
  }
  
  return SUCCESS;
 }

随后要加上自己的理解