JPA/@PostPersist @PostUpdate - 事务 [英] JPA / @PostPersist @PostUpdate - transaction

问题描述

我目前正在使用 @PostPersist 和 @PostUpdate，并且在这些触发器中我正在持久化其他实体.问题是，这些触发器是否在同一个事务中，如果不是，是否可以强制执行?

I am currently working with @PostPersist and @PostUpdate, and in those triggers I am persisting additional entities. The question is, are those triggers in the same transaction and if not is it possible to force it ?

对我来说它是这样工作的.当我查看日志时，事务不存在(它在触发器启动之前提交)，这阻止了我(没有 REQUIRES_NEW 来自注入 bean 的持久化方法)将其他实体保存在数据库.REQUIRED 属性被完全忽略，MANDATORY 属性不会抛出异常.

For me it works this way. While I was looking through the logs the transaction isn't existing ( it's commited just before the trigger is launched ) which prevents me ( without REQUIRES_NEW on the persisting method from injected bean ) from saving the additional entities in database. REQUIRED attribute is totally ignored, and MANDATORY attribute do not throw an exception.

这可能是 JUnit 的问题(因为我处于开发阶段，没有在完整环境中测试行为.)?

Can it be the problem with JUnit ( since I am in the dev. phase and did not test the behavior on full env. ) ?

如果无法在此触发器上扩展事务，如何确保如果回滚发生在@PostPersist 和@PostUpdate 之前，这些操作也会被回滚.

If extending the transaction on this triggers is not possible, how to ensure that if the rollback occurs before the @PostPersist and @PostUpdate, those operations also will be rollbacked.

推荐答案

如果您使用的是 Spring，您可以随时向您当前的事务管理器注册一个 TransactionSynchronization 以在诸如提交等事件时被回调您当前正在运行的事务:

If you're using Spring you could always register a TransactionSynchronization with your current transaction manager to be called back on events such as commits of your currently running transaction:

@PostPersist
void onPersist() {
    TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronizationAdapter() {

      @Override
      public void beforeCommit(boolean readOnly) {
        // do work
      }
    });
  }    
}

TransactionSynchronization 还在事务成功提交之后和事务完成之前/之后提供回调.

A TransactionSynchronization also provides callbacks after a transaction has committed successfully and before/after a transaction completes.

如果您需要检查事务是否已提交或回滚，请使用afterCompletion(int status).

If you need to inspect if the transaction was committed or rolled back, use afterCompletion(int status).

详情请看TransactionSynchronization 的 JavaDoc.

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