Hibernate 如何为多对多关联编写HQL查询

所以我花了几个小时试图为多对多关系编写一个HQL查询。对于我尝试过的所有查询，即使在阅读hibernate文档之后，也没有任何效果。有人能帮我吗？先谢谢你

我已经尝试过内部连接、连接和外部连接（带或不带提取）。我认为这个问题可能与香水类中的一对多关系有关

@Query("FROM Category c INNER JOIN FETCH c.fragrances f WITH c.referencedId = 1")
List<Category> getCatalog();

不带get/setter的Category类

@Entity
public class Category extends AbstractEntity {

   @Column(name = "name", nullable = false)
   private String name;

   @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
   @JoinTable(name = "Category_has_Fragrance",
        joinColumns = @JoinColumn(name = "category_id"),
        inverseJoinColumns = @JoinColumn(name = "fragrance_id")
   )
   @OrderBy("name")
   private List<Fragrance> fragrances;

   @Column(name = "referenced_id", nullable = false)
   private int referencedId;
]

@Entity
public class Fragrance extends AbstractEntity {

    @Column(name = "name", nullable = false)
    private String name;

    @Column(name = "description", nullable = false)
    private String description;

    @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "fragrances")
    private Set<Category> categories;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "fragrance")
    private List<FragrancedProduct> fragrancedProducts;

    @Column(name = "image_path")
    private String imagePath;
}

香水类不含get/setters

@Entity
public class Category extends AbstractEntity {

   @Column(name = "name", nullable = false)
   private String name;

   @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
   @JoinTable(name = "Category_has_Fragrance",
        joinColumns = @JoinColumn(name = "category_id"),
        inverseJoinColumns = @JoinColumn(name = "fragrance_id")
   )
   @OrderBy("name")
   private List<Fragrance> fragrances;

   @Column(name = "referenced_id", nullable = false)
   private int referencedId;
]

@Entity
public class Fragrance extends AbstractEntity {

    @Column(name = "name", nullable = false)
    private String name;

    @Column(name = "description", nullable = false)
    private String description;

    @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "fragrances")
    private Set<Category> categories;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "fragrance")
    private List<FragrancedProduct> fragrancedProducts;

    @Column(name = "image_path")
    private String imagePath;
}

试试这个：

select c from Category c join c.fragrances f where c.referencedId = :id

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你可以在这里检查一个类似的问题：

可能是重复的谢谢，我昨晚可能遇到了一些可能有用的问题。你的询问帮助我找到了根本问题。问题是，我有一个名为Set的表名，在我拥有的所有关系中，hibernate试图从表集中进行选择。我再也不能在列或表名中使用关键字了