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  • 使用spring jpa 时,利用nativeQuery,获取数据,无需新建实体,按照别名返回Json数据

    刚开始是这样写的

        @Query(value = "SELECT ll.user_id id ,u.catong_img catong_img,ll.locationId location_id,ll.address address,ll.latitude latitude,ll.longitude longitude,ll.update_time update_time,ll.user_id user_id FROM t_user as u left JOIN (SELECT l.id locationId, address,latitude,longitude,l.update_time,l.user_id FROM t_user_location AS l RIGHT JOIN ( SELECT user_id, max( update_time ) update_time FROM t_user_location GROUP BY user_id ) AS t ON l.user_id = t.user_id AND l.update_time = t.update_time ) ll ON u.zu_id =?1 and u.id = ll.user_id",nativeQuery = true)
        @Transactional
        List getAllUserLocationByZuId(long zuId);
    

    发现返回的数据是这样的,设置的别名没有返回

    [
      [
        1,
        "吕志豪",
        "",
        3,
        "3",
        3,
        3,
        1513670259000,
        1
      ],
      [
        2,
        "胡勇",
        "",
        2,
        "2",
        2,
        2,
        1513151843000,
        2
      ]
    ]
    

    之后是这样写的,使用EntityManager

        @PersistenceContext
        private EntityManager em;
        @Override
        public List getAllUserLocation(long zuId) {
           return em.createNativeQuery("SELECT  u.name name ,u.catong_img catongImg,ll.locationId locationId,ll.address address,ll.latitude latitude,ll.longitude longitude,ll.update_time updateTime,ll.user_id userId FROM t_user as u left JOIN (SELECT l.id locationId, address,latitude,longitude,l.update_time,l.user_id FROM t_user_location AS l RIGHT JOIN ( SELECT user_id, max( update_time ) update_time FROM t_user_location GROUP BY user_id ) AS t ON l.user_id = t.user_id AND l.update_time = t.update_time ) ll ON u.zu_id =1 and u.id = ll.user_id")
            .unwrap(SQLQuery.class)
                    .setResultTransformer(
                            AliasToEntityMapResultTransformer.INSTANCE
                    )
                    .list();
        }
    

    结果返回

    [
      {
        "catongImg": "",
        "address": "3",
        "locationId": 3,
        "latitude": 3,
        "name": "吕志豪",
        "updateTime": 1513670259000,
        "userId": 1,
        "longitude": 3
      },
      {
        "catongImg": "",
        "address": "2",
        "locationId": 2,
        "latitude": 2,
        "name": "胡勇",
        "updateTime": 1513151843000,
        "userId": 2,
        "longitude": 2
      }
    ]
    
    原文地址:https://www.jianshu.com/p/e6bc577d03f0
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  • 原文地址:https://www.cnblogs.com/jpfss/p/11162553.html
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