springdata jpa 查询部分字段

jpql 分页查询部分字段，不采用interface接口类，采用Map接收

• Map接收查询结果，再从Map里取值

      //查询地图巡查员详情信息
    @Query(value = "select obs.id as id,obs.observerName as observerName,obs.isOnline as isOnline,obs.geoX as geoX,obs.geoY as geoY," +
            "obs.gpsTime as gpsTime,obs.mobile as mobile,obs.userType as userType,ar.areaName as areaName,an.filePath as obsIcon,ows.signDate as signDate " +
            " from Observer obs left join Area ar on (obs.areaId = ar.id) " +
            "left join ObserverWorkSignLog ows on (obs.id = ows.observerId) left join Annexe an on (obs.photoId = an.id)" +
            "where obs.id = ?1 order by ows.signDate DESC ")
    Page<Map<String,Object>> findObserverDetailInfo(Long obsId,Pageable pageable);
  

• Map取值，这里是因为相关数据有多条，只需要最新一条，采用分页，但只查一条 Pageable pageable=PageRequest.of(0,1);

    @Override
    public SuperviseObserverInfo findObserverDetailInfo(Long obsId){
        Pageable pageable=PageRequest.of(0,1);
        SuperviseObserverInfo observerInfo = null;
        Page<Map<String,Object>> info = observerRepository.findObserverDetailInfo(obsId,pageable);
        if (null != info.getContent()){
            Map<String,Object> map = info.getContent().get(0);
            observerInfo = new SuperviseObserverInfo();
            observerInfo.setId(KEDataTypeUtil.objToLong(map.get("id")));
            observerInfo.setAreaName(KEDataTypeUtil.objToString(map.get("areaName")));
            observerInfo.setObserverName(map.get("observerName").toString());
            observerInfo.setMobile(map.get("mobile").toString());
            observerInfo.setIsOnline(KEDataTypeUtil.objToInteger(map.get("isOnline")));
            observerInfo.setUserType(KEDataTypeUtil.objToInt(map.get("userType")));
            observerInfo.setGeoX(KEDataTypeUtil.objToDouble(map.get("geoX")));
            observerInfo.setGeoY(KEDataTypeUtil.objToDouble(map.get("geoY")));
            observerInfo.setObsIcon(KEDataTypeUtil.objToString(map.get("obsIcon")));
            observerInfo.setGpsTime(KEDataTypeUtil.objToTimestamp(map.get("gpsTime")));
            observerInfo.setSignDate(KEDataTypeUtil.objToTimestamp(map.get("signDate")));
        }
        return observerInfo;
    }
  

• 如果查询多条，并且分页可以使用interface写法
  interface查询部分字段