Hibernate/JPA :删除子项时从多个父项中删除

@Entity
public class Parent {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true)
    private List<Child> children = new ArrayList<>();

    // 省略其他属性和方法
}

@Entity
public class Child {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne
    private Parent parent;

    // 省略其他属性和方法
}

// 删除子项时从多个父项中删除的示例代码
EntityManager entityManager = // 获取EntityManager对象
entityManager.getTransaction().begin();

Parent parent1 = entityManager.find(Parent.class, parentId1);
Parent parent2 = entityManager.find(Parent.class, parentId2);

List<Child> childrenToRemove = new ArrayList<>();
for (Child child : parent1.getChildren()) {
    if (child.getParent() == parent2) {
        childrenToRemove.add(child);
    }
}

parent1.getChildren().removeAll(childrenToRemove);
entityManager.remove(childrenToRemove);

entityManager.getTransaction().commit();