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  • JPA中使用@Query注解多表联查

    原生SQL:

    select `user`.id, `user`.`name`,dept.name deptName,sum(sd.score) SumScore

    from `user`

    LEFT JOIN
    score_detail sd
    ON
    `user`.id = sd.user_id

    LEFT JOIN
    department dept
    ON
    `user`.department_id = dept.id

    GROUP BY `user`.`id` ORDER BY sum(sd.score);

    经过查阅多方资料得知,

    异常: org.hibernate.hql.ast.QuerySyntaxException: Path expected for join

    HQL是面向对象的,所以join的条件是反映在对象的关系中的,所以,你在用join的时候,无论是left join还是right join,都是

    FROM DomainA a LEFT JOIN a.b b WHERE

    或者

    FROM DomainA a RIGHT JOIN a.b b WHERE

    而不能直接是两个对象直接JOIN。

    最终结果:

    @Query("SELECT NEW com.ygsm.pojo.vo.SumScoreRankVO(u.id, u.name, d.name, SUM(s.score)) "
    + "FROM ScoreDetail s "
    + "RIGHT JOIN s.user u "
    + "RIGHT JOIN u.department d "
    + "WHERE s.createDate BETWEEN ?1 AND ?2 "
    + "GROUP BY u.id "
    + "ORDER BY SUM(s.score) DESC")
    List<SumScoreRankVO> findUserScoreRank(Date startDate, Date endDate);

     

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  • 原文地址:https://www.cnblogs.com/jiangzuomeng/p/11842718.html
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