欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

Java中使用hql,sql查询返回的list 转成需要的实体对象--方法讲解!
程序员文章站 2022-05-14 18:00:26
...



需要将Query对象setResultTransformer:



List list = session.createSQLQuery(sql).setResultTransformer(

Transformers.ALIAS_TO_ENTITY_MAP).list();

//此时,每个Object可以转换成一个Map

Map map = (Map) list.get(i);

map.get("PARENT_ID");  //这里的key 一定是 数据库对应的字段名才行







例如:





// 查询出数据 

  String hql = "select a.id as emergencyBasExeId,a.LEVEL as level,a.SEND_TIME as sender_time,a.NAME as name,a.CONTENT as content " +

    ",a.PROCESS_ID as processId,m.STATES as states,m.id as id,m.emergencyInfoSecondMgr.id as emergencySencondMgrId " +

    " from EmergencyInfoFirstExe a,  EventManage m where a.deleteFlag = 0 and a.id=m.emergencyInfoFirstExe.id ";

  // 查询出数据list

  List exeList = eventManageDao.notifyHqlPage(hql, pageNumber * pageSize, pageSize);



  // 返回所需要的数据List

  List<EventInfoView> reList = new ArrayList<EventInfoView>();





  //map.get("PARENT_ID");  //这里的key 一定是 数据库对应的字段名才行 

  //对返回List的数据封装 

  for(Object exe : exeList){

   EventInfoView event = new EventInfoView();

   //此时,每个Object可以转换成一个Map 

   Map map=(Map)exe;

   //然后可以使用map.get("属性名");即可取值

   event.setId(map.get("id").toString());

   event.setContent(map.get("content").toString());

   event.setEmergencyBasExeId(map.get("emergencyBasExeId").toString());

   event.setEmergencySencondMgrId(map.get("emergencySencondMgrId").toString());

   event.setEmergencyTitle(map.get("emergencyTitle").toString());

   event.setLevel(map.get("level").toString());

   event.setName(map.get("name").toString());

   event.setProcessId(map.get("processId").toString());

   event.setProcessName(map.get("processName").toString());

   event.setSender_time(map.get("sender_time").toString());

   event.setStates(map.get("states").toString());

   //....

   reList.add(event);

  }