Hibernate更新/删除一对多集合

Question

我有两个类parent和child，它们具有一对多关系。

假设我已经在我的数据库结构中持久化了，如下所示：

Parent--> Child1, Child2

Parent--> Child1, ​Child3

---编辑---

实体不是什么花哨的东西，比如：

@Entity
@Data
public class Parent {
   @Id
   @GeneratedValue(strategy = SEQUENCE)
   private long id;

   @OneToMany(mappedBy = "parent", casade = CasadeType.ALL, orphanRemoval = true)
   private Set<Child> childList;
}


@Entity
@Data
public class Child {
   @Id
   @GeneratedValue(strategy = SEQUENCE)
   private long id;

   @ManyToOne
   @JoinColumn(name = "xxx")
   private Parent parent;

}

Answer 1

这是我遵循的模式：

    @Entity
    @Data
    public class Parent {
       @Id
       @GeneratedValue(strategy = SEQUENCE)
       private long id;

       @OneToMany(mappedBy = "parent", casade = CasadeType.ALL, orphanRemoval = true)
       private Set<Child> childList = new HashSet<>();
       
       public void addChild(Child child){

            if(child!=null){
              this.childList.add(child);
              child.setParent(this);   
            }
       }

       public void removeChild(Child child){

            if(child!=null){
              this.childList.remove(child);
              child.setParent(null);   
            }
       }

       public void updateChildren(Collection<Child> children){
           childList.forEach(x-> if(!children.contains(x)) this.removeChild(x); );
             
           children.forEach(x-> this.addChild(x));
       }