使用注释休眠一对多删除 [英] Hibernate one-to-many deleting with annotations

问题描述

我在休眠时删除OneToMany和ManyToOne时遇到问题。我想问题是我有一个孩子的父母。这是我如何得到的。

I have a problem with deleting OneToMany and ManyToOne on hibernate. I guess the problem is that I have two parents for a single child. This is how I got it

Persona        Rol        Pais
 id             id         id
 name           name       name
 Pais
 Rol

正如您所看到的，person（persona）与角色（rol）和国家（pais）。
我的实体是这样的：

As you can see, the person (persona) is related to the role (rol) and the country (pais). My entities are like this:

Person

public class Persona  implements java.io.Serializable {
  @ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name="Pais", nullable=false)
    public Pais getPais() {
       return this.pais;
    }

@ManyToOne(fetch=FetchType.LAZY)
   @JoinColumn(name="Rol", nullable=false)
   public Rol getRol() {
      return this.rol;
   }

Pais（国家）

public class Pais  implements java.io.Serializable {
   private Set<Persona> personas = new HashSet<Persona>(0);
   @OneToMany(fetch=FetchType.LAZY, mappedBy="pais", cascade=CascadeType.ALL,orphanRemoval=true)
  public Set<Persona> getPersonas() {
    return this.personas;

Rol（角色）

public class Rol  implements java.io.Serializable {
  private Set<Persona> personas = new HashSet<Persona>(0);

  @OneToMany(fetch=FetchType.LAZY, mappedBy="rol", cascade=CascadeType.ALL,orphanRemoval=true)
    public Set<Persona> getPersonas() {
      return this.personas;
    }

我试图删除Person并且只有这个人，所以我认为我必须首先将国家和角色分开，然后删除该人员，但这不起作用。这是我删除的代码

I'm trying to delete the Person and only the person so I think that I have to detach the country and the role first and then delete the person but that doesn't work. This is my code for deleting

session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
Persona p = (Persona)session.load(Persona.class, idPersona);
Pais pais = (Pais)session.load(Pais.class, p.getPais().getId()); //try to p.getPais();
rol rol = (Rol)session.load(Rol.class,p.getRol().getId()); //try to p.getRol();
pais.getPersonas().remove(p);
rol.getPersonas().remove(p);
p.setPais(null);
p.setRol(null);
session.update(pais);
session.update(rol);
session.delete(p);
session.getTransaction().commit();
session.close();

希望你能帮助我，这个在hibernate中删除的东西吓到我了。

Hope you can help me, this deleting thing in hibernate is freaking me out.

推荐答案

如果你只是想删除Person。您可以删除它。

If you just want to delete Person. You can just delete it.

session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
Persona p = (Persona)session.load(Persona.class, idPersona);
session.delete(p);
session.getTransaction().commit();
session.close();

这篇关于使用注释休眠一对多删除的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！