HQL查询以一对多关系获取一些项目

Question

我搜索了互联网的所有内容，但没有找到答案。

我在两个类之间有一个oneToMany关系，我想获得列表的一部分。

@Entity
@Table(name = "author")
class Author {
     @Id
     private Long id;

     @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
     @JoinColumn(name = "AUTHOR_ID", referencedColumnName = "id")
     private List<Book> books = new ArrayList<>();

}

@Entity
@Table(name="book")
class Book {

    @Column
    private Integer year;

    @Column
    private Integer position;

}

我想让所有具有特定年份且低于特定作者的特定职位的图书

@Query(From Book b where b.year=:year and b.position<:position and b.authorId=:id)
List<Book> getAllBooks(Integer year, Integer position, Long id)

我也尝试过

@Query(From Book b where b.year=:year and b.position<:position and b.id in (select a.books.id from author a where a.id:=id)

感谢你们对我的帮助

Answer 1

如果您尝试使用JPQL设置查询，对我来说看起来应该是...

@Query("SELECT b FROM Book b WHERE b.year = :year and b.position < :position and b.authorId = :id")

更新资料

抱歉-我之前通过复制和修改第一个示例来回答。 我错过了参加。

这可能有效...

@Query("SELECT a.books b FROM Author a WHERE b.year = :year AND b.position < :position AND a.authorId = :id")

您也可以尝试这个...

@Query("SELECT b FROM Book b WHERE b.year = :year AND b.position < :position AND b IN (SELECT a.books FROM Author a WHERE a.id = :id")