JPA CascadeType.ALL 不删除孤儿 [英] JPA CascadeType.ALL does not delete orphans

问题描述

我在使用 JPA 和以下映射删除孤立节点时遇到问题

I am having trouble deleting orphan nodes using JPA with the following mapping

@OneToMany (cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "owner")
private List<Bikes> bikes;

我遇到了围绕数据库的孤立角色的问题.

I am having the issue of the orphaned roles hanging around the database.

我可以使用注释 org.hibernate.annotations.Cascade Hibernate 特定标记，但显然我不想将我的解决方案与 Hibernate 实现联系起来.

I can use the annotation org.hibernate.annotations.Cascade Hibernate specific tag but obviously I don't want to tie my solution into a Hibernate implementation.

编辑:似乎 JPA 2.0 将包含对此的支持.

EDIT: It seems JPA 2.0 will include support for this.

推荐答案

如果您将它与 Hibernate 一起使用，则必须显式定义注释 CascadeType.DELETE_ORPHAN，它可以用于与 JPA CascadeType.ALL 结合使用.

If you are using it with Hibernate, you'll have to explicitly define the annotation CascadeType.DELETE_ORPHAN, which can be used in conjunction with JPA CascadeType.ALL.

如果您不打算使用 Hibernate，则必须先明确删除子元素，然后再删除主记录以避免任何孤立记录.

If you don't plan to use Hibernate, you'll have to explicitly first delete the child elements and then delete the main record to avoid any orphan records.

执行顺序

1. 获取要删除的主行
2. 获取子元素
3. 删除所有子元素
4. 删除主行
5. 闭会

在 JPA 2.0 中，您现在可以使用选项 orphanRemoval = true

With JPA 2.0, you can now use the option orphanRemoval = true

@OneToMany(mappedBy="foo", orphanRemoval=true)

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