JPA Repository nativeQuery with pageable, join table 在 pageable.size = 1 时不工作

Question

我有这个 sql 查询很好用

SELECT ppd.userId, AVG(Coalesce(sm.score, 0)) AS avgScore
    FROM Table1 ppd 
    LEFT JOIN Table2 sm ON ppd.userId = sm.userId AND sm.created BETWEEN start AND end
    WHERE ppd.someId IN (listOfIds) 
    GROUP BY ppd.userId ORDER BY avgScore DESC LIMIT 1 OFFSET 0;

我在 JPARepository 中编写了一个方法查询，如下所示

@Query(value = "SELECT ppd.userId, AVG(Coalesce(sm.score, 0)) AS avgScore " +
            " FROM Table1 ppd " +
            " LEFT JOIN Table2 sm ON sm.userId = ppd.userId AND sm.created BETWEEN :start AND :end " +
            " WHERE ppd.someId IN (:IdList) GROUP BY ppd.userId",
            nativeQuery = true)
    Page<MyDtoProjection> getAvg(@Param("IdList") List<String> IdList,
                                 @Param("start") Long start,
                                 @Param("end") Long end,
                                 Pageable pageable);

除了当可分页大小为 1 时（SQL 限制为 1 的查询工作正常），它按预期工作。对于可分页参数，服务发送以下可分页对象

Sort sort = JpaSort.unsafe(Sort.Direction.ASC, "(avgScore)");
Pageable pageable = PageRequest.of(offset, limit, sort);

请求设置offset=0和limit=1

我从使用存储库代码的请求中收到的错误是： Unknown column 'ppd' in 'field list'\nQuery is: select count(ppd)...，我不知道为什么它以别名ppd作为列名，另外，我从另一个post上读到，这种执行本机查询的方式执行计数（可以在错误消息，我没有指定那个计数查询），并且可以通过设置 countQuery 参数来指定，但我不确定在那里写什么。

Answer 1

解决> 刚刚将 countQuery 添加到 @Query 注释中，我不太确定在那里放什么，但这很简单

@Query(value = "SELECT ppd.userId, AVG(Coalesce(sm.score, 0)) AS avgScore " +
            " FROM Table1 ppd " +
            " LEFT JOIN Table2 sm ON sm.userId = ppd.userId AND sm.created BETWEEN :start AND :end " +
            " WHERE ppd.someId IN (:IdList) GROUP BY ppd.userId",
       countQuery = "SELECT COUNT(ppd.userId) FROM Table1 ppd " +
            "WHERE ppd.userId IN (:IdList) GROUP BY ppd.userId",
       nativeQuery = true)
    Page<MyDtoProjection> getAvg(@Param("IdList") List<String> IdList,
                                 @Param("start") Long start,
                                 @Param("end") Long end,
                                 Pageable pageable);

这是我发现的唯一 post 在其中一个答案中提到了 countQuery 及其工作原理，去看看是否有人正在经历同样的事情 Spring Data and Native Query with pagination

JPA Repository nativeQuery with pageable, join table 在 pageable.size = 1 时不工作

JPA Repository nativeQuery with pageable, join table not working when pageable.size = 1

java

sql

jpa

repository

nativequery