更改 parent 集 JPA 2 + Hibernate 5 后，孤儿不会被删除

Question

我可能做错了什么，但我不知道是什么。我有 2 个 table 和 2 个具有以下映射的实体

@Entity
@EntityListeners(AuditingEntityListener.class)
@Table(name = "parent")
public class Parent {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @JsonIgnore
    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true)
    @LazyCollection(LazyCollectionOption.FALSE)
    @Getter
    private List<ChildBase> childs;

    public Parent(){

      this.childs = new ArrayList ();

}



@Entity
@Table(name = "childs")
@Getter
@Setter
@ToString
@Accessors(chain = true)
@NoArgsConstructor
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class ChildBase {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    protected long id;

    @JoinColumn(nullable = false)
    @ManyToOne
    @ToString.Exclude
    protected Parent parent;

    public ChildBase(Parent parent){
      this.parent = parent;
      }

}


@Entity
@EqualsAndHashCode(callSuper = true)
@NoArgsConstructor
@Getter
@Setter
@Accessors(chain = true)
public class MyChild extends ChildBase {
    @Enumerated(EnumType.STRING)
    @Column(name = "name")
    private String name;

    public MyChild(String name, Parent parent) {
        super(parent);
        this.name = name;
    }

一旦我尝试通过以下测试断开 parent 与 child 的连接，问题就会出现：

@Test
public void test(){

Parent parent = new Parent();
MyChild child1 = new MyChild("a", parent);
MyChild child2 = new MyChild("a", parent);
parent.getChilds.add(child1);
parentRepository.save(parent);

parent.getChilds.remove(child1);
parent.getChilds.add(child2);
parentRepository.save(parent);
}

我希望只看到“childs”table 中的第二 child 行，但我看到了它们。

编辑：

我也试过在第二次保存之前从 child 引用 null，如下所示：child1.setParent(null)。也无济于事

Answer 1

这是双向关系，MyChild 分别是 ChildBase 是关系的拥有方。

要触发孤儿删除，您也必须 child1.setParent(null)。

更新：进行了聊天提供的设置。这是类，它工作得很好。

@Entity
@EntityListeners(AuditingEntityListener.class)
@Table(name = "parent")
public class Parent {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @JsonIgnore
    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true)
    @LazyCollection(LazyCollectionOption.FALSE)
    @Getter
    private List<ChildBase> childs;

    public Parent(){

      this.childs = new ArrayList<>();
    }

}

@Entity
@Table(name = "childs")
@Getter
@Setter
@ToString
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@Accessors(chain = true)
@NoArgsConstructor
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class ChildBase {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @EqualsAndHashCode.Include
    protected long id;

    @JoinColumn(nullable = false)
    @ManyToOne
    @ToString.Exclude
    protected Parent parent;

    public ChildBase(Parent parent){
      this.parent = parent;
    }

}

@Entity
@NoArgsConstructor
@Getter
@Setter
@Accessors(chain = true)
public class MyChild extends ChildBase {
  
    @Column(name = "name")
    private String name;

    public MyChild(String name, Parent parent) {
        super(parent);
        this.name = name;
    }
}

这是测试。执行后数据库中只有childB.

    @Test
    void test() {
        Parent parent = new Parent();
        MyChild child1 = new MyChild("childA", parent);
        MyChild child2 = new MyChild("childB", parent);
        parent.getChilds().add(child1);
        parentRepository.save(parent);

        parent.getChilds().remove(child1); // first remove
        child1.setParent(null);            // set parent null

        parent.getChilds().add(child2);
        parentRepository.save(parent);
    }

更改 parent 集 JPA 2 + Hibernate 5 后，孤儿不会被删除

orphans are not getting deleted once changing the parent set JPA 2 + Hibernate 5

java

hibernate

spring-data-jpa