hibernate - 连接表记录删除时违反参照完整性约束

Question

用户和组之间存在多对多关系。

@Entity
class User {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = 'id.user')
    Set<GroupMembership> memberships
}

@Entity
class Group {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = 'id.group')
    Set<GroupMembership> members
}

@Entity
class GroupMembership {

    @Embeddable
    static class IdKey implements Serializable {

        @ManyToOne
        @JoinColumn(name = 'userId')
        User user

        @ManyToOne
        @JoinColumn(name = 'groupId')
        Group group
    }

    @EmbeddedId
    IdKey id = new IdKey()
}

我希望能够删除用户或组，并删除任何关联的组成员资格。但是，当我尝试删除用户或组时，我得到:

org.h2.jdbc.JdbcSQLException: Referential integrity constraint violation: "FK_96K9TDEV9PO6Q3ISOYIJPWAQU: PUBLIC.GROUP_MEMBERSHIPS FOREIGN KEY(GROUP_ID) REFERENCES PUBLIC.GROUP(ID) (1)"; SQL statement:
delete from group where id=? [23503-186]

我正在使用 Hibernate 4.3.8 和 Spring Data JPA 1.7.2。

Answer 1

当然，尽管我花了几个小时寻找答案，但我在发布这个问题后一个小时内就找到了答案。

添加 Hibernate 实现特定的 @OnDelete 注释似乎可以修复它。显然，@OneToMany 上的级联属性仅影响 EntityManager，而不会使其进入生成的 DDL。

@Entity
class Group {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = 'id.group')
    @OnDelete(action = OnDeleteAction.CASCADE)
    Set<GroupMembership> members
}