Hibernate：在类中使用mappedBy来扩展另一个注解为JoinedSubclass的类？ [英] Hibernate: Used mappedBy on class that extends another class annotated as JoinedSubclass?

问题描述

以下行不通：

  @Entity 
类所有者{
 
 @OneToMany（mappedBy =owner，cascade = {CascadeType.ALL}）
 protected Set< B> getBSet（）{
 .. 
} 
 
} 
 
 @实体
 @Inheritance（strategy = InheritanceType.JOINED）
 class A {
 @ManyToOne 
 Public Owner getOwner（）{
 ... 
} 
} 
 
 @实体
 class B扩展A {b 
 $ b} 
  

：
org.hibernate.AnnotationException：mappedBy引用未知目标实体属性：B.user in Owner。

我试图避免复制owner属性转换为B类（这将因此非规范化并将所有者密钥复制到为实体A和B生成的两个表中）。另外，我真的希望将A和B放在单独的表中，而不必使用SingleTable继承来使用鉴别器。

另外，我无法弄清楚如何在A和B之间使用@OneToOne来做类似的事情（而不是让B扩展A）。奇怪，但它是故意的。我有博文和背景信息，链接和JOINED解决方案的解决方法。

The following doesn't work:

@Entity
class Owner {

  @OneToMany(mappedBy="owner", cascade = {CascadeType.ALL})
  protected Set<B> getBSet() {
    ..
  }

}

@Entity
@Inheritance(strategy=InheritanceType.JOINED)
class A {
   @ManyToOne
   public Owner getOwner() {
     ...
   }
}

@Entity
class B extends A {

}

It causes an exception as such: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: B.user in Owner.

I am trying to avoid copying the "owner" property into class B (which will consequently "denormalize" and copy the owner key into both tables generated for entity A and B). Also, I would really like to have A and B in a separate table and not have to use a discriminator by using SingleTable inheritance.

Also, I can't figure out how to do something similar by using @OneToOne between A and B (and not having B extend A).

解决方案

It's a Hibernate oddity, but it's deliberate. I have a blog post up with background information, links and a workaround for the JOINED solution.

这篇关于Hibernate：在类中使用mappedBy来扩展另一个注解为JoinedSubclass的类？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！