休眠：用继承覆盖sql-delete [英] Hibernate: Overwrite sql-delete with inheritace

问题描述

我有一个实体 A 并且 B扩展了A 并尝试使用联合继承策略进行软删除。

$ p $ @Entity
@Inheritance（strategy = InheritanceType.JOINED）
@SQLDelete（UPDATE A SET deleted = 1 WHERE id =？）
A {

@Id long id;
布尔删除;
}

@实体
B延伸A {}


看起来，Hibernate正确地将表 A 设置为已删除= 1 ，但也会将整个条目从表 B 。当然，我想保留这个条目。

对此有何看法？

我是使用Hibernate 3.5.5和基于注释的实体定义。

解决方案

您希望创建一个DeleteEventListener，如下所示：

  public class SoftDeleteEventListener extends DefaultDeleteEventListener {
 
 private static final long serialVersionUID = 1L; 
 $ b $ @Override 
 public void onDelete（DeleteEvent event，Set arg1）throws HibernateException {
 Object o = event.getObject（）; 
 if（o SoftDeletable的实例）{
（（SoftDeletable）o）.setStatusId（1）; 
 EntityPersister persister = event.getSession（）。getEntityPersister（event.getEntityName（），o）; 
 EntityEntry entityEntry = event.getSession（）。getPersistenceContext（）。getEntry（o）; 
 cascadeBeforeDelete（event.getSession（），persister，o，entityEntry，arg1）; 
 
 cascadeAfterDelete（event.getSession（），persister，o，arg1）; 
 
} else {
 super.onDelete（event，arg1）; 
 
 
 
 $ b  

勾住它进入你的persistence.xml中，像这样
$ b

 < property name =hibernate.ejb.event。删除value =org.something.SoftDeleteEventListener/> 
  

另外，别忘了更新注释中的级联。

I have an entity A and B extends A and try to have a soft-delete with joined inheritance strategy.

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@SQLDelete("UPDATE A SET deleted = 1 WHERE id = ?")
A {

    @Id long id;
    boolean deleted;
}

@Entity
B extends A {}

It seems that Hibernate properly sets the table A to deleted = 1, but also deletes the whole entry from table B. I would, of course, like to preserve this entry.

Any ideas on that?

I'm using Hibernate 3.5.5 and annotation-based entity definition. Tried Hibernate 3.6.2 as well.

解决方案

You'd want to create a DeleteEventListener as such:

public class SoftDeleteEventListener extends DefaultDeleteEventListener {

private static final long serialVersionUID = 1L;

@Override
public void onDelete(DeleteEvent event, Set arg1) throws HibernateException {
    Object o = event.getObject();
    if (o instanceof SoftDeletable) {
        ((SoftDeletable)o).setStatusId(1);
        EntityPersister persister = event.getSession().getEntityPersister( event.getEntityName(), o);
        EntityEntry entityEntry = event.getSession().getPersistenceContext().getEntry(o);
        cascadeBeforeDelete(event.getSession(), persister, o, entityEntry, arg1);

        cascadeAfterDelete(event.getSession(), persister, o, arg1);

    } else {
        super.onDelete(event, arg1);
    }
}

}

hook it into your persistence.xml like this

<property name = "hibernate.ejb.event.delete" value = "org.something.SoftDeleteEventListener"/> 

Also, don't forget to update your cascades in your annotations.

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