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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

热度:37   发布时间:2016-05-05 10:49:03.0
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);

? }

?