使用SpringDateJPA用@Query写的原生sql分组聚合查询遇到的坑

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排查后发发现如果我们在springDateJPA中使用的原生sql中函数聚合函数的话查询出来的结果不能直接映射实体类以为属性的数量和类型在查询的时候并不能确定所以需要使用List>来接受后再尝试转换成对应实体类的属性

 @Query(value = "SELECT o.count_time AS mouthAndDay,SUM(o.total_occupy_quantity) AS quantity FROM " +
            "(" +
            "SELECT * FROM t_m_occupy_quantity_d d WHERE d.parking_lot_id = :parkingLotId AND d.count_time BETWEEN :countTimeStart AND :countTimeEnd" +
            ") o " +
            "GROUP BY o.count_time"
            ,nativeQuery = true)
List<Map<String,Object>> findByParkingLotIdAndCountTimeGroupBy(@Param("parkingLotId") Long parkingLotId, @Param("countTimeStart") String countTimeStart, @Param("countTimeEnd") String countTimeEnd);

还有一点需要注意的就是如果sql中函数聚合分组查询的时候对应的聚合函数计算的字段对应的类型需要是BigIntger或者BigDecimal.