有没有办法强制事务性回滚而不会遇到异常？ [英] is there a way to force a transactional rollback without encountering an exception?

问题描述

我有一种方法可以处理一堆事情;在他们之中做一些插入和更新。它是这样声明的...

$ p $ @Transactional（propagation = Propagation.REQUIRED，isolation = Isolation.DEFAULT，readOnly = false）
public int saveAll（）{
// do stuff;
}


它的工作原理与我的理解完全一样，并且我没有任何问题。然而，当我想要强制回滚时，尽管没有出现异常情况，但有些情况下......目前，当我遇到正确的条件时，我强制执行一个例外情况，但这很丑陋，我不喜欢它。

我能否以某种方式主动调用回滚？

解决方案

调用 setRollbackOnly（ ）在 SessionContext 上，如果您在EJB中。

您可以注入 SessionContext 就像这样：

  public MyClass {
 @Resource 
 private SessionContext sessionContext; 
 $ b @Transactional（propagation = Propagation.REQUIRED，
 isolation = Isolation.DEFAULT，
 readOnly = false）
 public int saveAll（）{
 / /做东西; 
 if（oops == true）{
 sessionContext.setRollbackOnly（）; 
 return; 
 
 
 code $ 
 $ b $ p $ setRollbackOnly（） code>是 EJBContext 的成员。  SessionContext 扩展 EJBContext ：
  http://java.sun.com/j2ee/1.4/docs/api/javax/ejb/SessionContext.html 请注意，它仅在会话EJB中可用。 
 $ b   @Resource 是标准的Java EE注释，因此您应该检查您在Eclipse中的设置。以下是如何使用示例 > @Resource 。
 
 
 
我怀疑这可能不是您的解决方案，因为您似乎可能没有使用EJB  - 解释为什么Eclipse没有找到 @Resource 。
 
 
 
如果是这种情况，那么您将需要与事务交互直接 - 查看交易模板。
 
I have a method that does a bunch of things; amongst them doing a number of inserts and updates. It's declared thusly...
@Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.DEFAULT, readOnly = false)
public int saveAll(){
 //do stuff;
}
It works exactly as it is supposed to and I have no problems with it. There are situations however when I want to force the rollback in spite of there not being an exception... at the moment, I'm forcing an exception when I encounter the right conditions, but it's ugly and I don't like it.

Can I actively call the rollback somehow? The exception calls it... I'm thinking maybe I can too.
解决方案
Call setRollbackOnly() on the SessionContext if you're in an EJB.

You can inject SessionContext like so:
public MyClass {
    @Resource
    private SessionContext sessionContext;

    @Transactional(propagation = Propagation.REQUIRED, 
                   isolation = Isolation.DEFAULT, 
                   readOnly = false)
    public int saveAll(){
        //do stuff;
        if(oops == true) {
             sessionContext.setRollbackOnly();
             return;
        }
    }
setRollbackOnly() is a member of EJBContext.  SessionContext extends EJBContext:
http://java.sun.com/j2ee/1.4/docs/api/javax/ejb/SessionContext.html  Note it's only available in session EJBs.

@Resource is a standard Java EE annotation, so you should probably check your setup in Eclipse.  Here's an example of how to inject the SessionContext using @Resource.

I suspect that this is probably not your solution, since it seems like you may not be working with EJBs -- explaining why Eclipse is not finding @Resource.

If that's the case, then you will need to interact with the transaction directly -- see transaction template.

                        
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