Java中使用hql,sql查询回来的list<Object> 转成需要的实体对象-方法讲解

Java中使用hql,sql查询返回的list<Object> 转成需要的实体对象--方法讲解!

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);

}

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