Spring事务管理中@Transactional的propagation参数
关于Spring事务管理中@Transactional的其他配置问题,请参看http://deltamaster.is-programmer.com/posts/28488.html。
本文重点讲一讲propagation参数,propagation配置的就是一个事务的传播性问题。
所谓事务传播性,就是被调用者的事务与调用者的事务之间的关系。举例说明。
//in A.java Class A { @Transactional(propagation=propagation.REQUIRED) public void aMethod { B b = new B(); b.bMethod(); } } //in B.java Class B { @Transactional(propagation=propagation.REQUIRED) public void bMethod { //something } }
在上面这个例子中,传播性被设为了REQUIRED,注意,这是默认值,也即不进行该参数配置等于配置成REQUIRED。
REQUIRED的含义是,支持当前已经存在的事务,如果还没有事务,就创建一个新事务。在上面这个例子中,假设调用aMethod前不存在任何事务,那么执行aMethod时会自动开启一个事务,而由aMethod调用bMethod时,由于事务已经存在,因此会使用已经存在的事务(也就是执行aMethod之前创建的那个事务)。
对于这样的配置,如果bMethod过程中发生异常需要回滚,那么aMethod中所进行的所有数据库操作也将同时被回滚,因为这两个方法使用了同一个事务。
MANDATORY的含义是,支持当前已经存在的事务,如果还没有事务,就抛出一个异常。如果上例中aMethod的传播性配置为MANDATORY,我们就无法在没有事务的情况下调用aMethod,因此,传播性为MANDATORY的方法必定是一个其他事务的子事务,当逻辑上独立存在没有意义或者可能违反数据、事务完整性的时候,就可以考虑设置这样的传播性设置。
NESTED的含义是,在当前事务中创建一个嵌套事务,如果还没有事务,那么就简单地创建一个新事务。
REQUIRES_NEW的含义是,挂起当前事务,创建一个新事务,如果还没有事务,就简单地创建一个新事务。
请注意以上两者的区别,大多数情况下一上两种传播性行为是类似的,不过在事务回滚的问题上,以上两者有很大的区别。
首先,REQUIRES_NEW会创建一个与原事务无关的新事务,尽管是由一个事务调用了另一个事务,但却没有父子关系。
如果bMethod的传播性是REQUIRES_NEW,而抛出了一个异常,则bMethod一定会被回滚,而如果aMethod捕获并处理了这个bMethod抛出的异常,那么aMethod仍有可能成功提交。当然,如果aMethod没有处理这个异常,那么aMethod也会被回滚。
如果aMethod在bMethod完成后出现了异常,那么bMethod已经提交而无法回滚,只有aMethod被回滚了。
而对于NESTED,虽然也会创建一个新事务,但是这个事务与调用者是有父子关系的相互依存的。
如果bMethod的传播性是NESTED,而抛出了一个异常,事务的回滚行为与REQUIRES_NEW是一致的。
但是如果aMethod在bMethod完成后出现了异常,bMethod同样也会被回滚。因为事实上,EJB中没有对于NESTED传播性的类似实现,NESTED并不是真正启动了一个事务,而是开启了一个新的savepoint。
NEVER的含义很简单,就是强制要求不在事务中运行,如果当前存在一个事务,则抛出异常,因此如果bMethod传播性是NEVER,则一定抛出异常。
NOT_SUPPORTED的含义是,强制不在事务中运行,如果当前存在一个事务,则挂起该事务。
SUPPORTS的含义是,支持当前事务,如果没有事务那么就不在事务中运行。SUPPORTS传播性的逻辑含义比较模糊,因此一般是不推荐使用的。
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시간을내어이 문제에 대해 토론 해 주셔서 감사합니다.이 주제에 대해 더 많이 배우고 싶습니다. 가능하다면 전문 지식을 얻으면 추가 정보로 블로그를 업데이트 해 주시겠습니까? 저에게 매우 도움이됩니다.
Feb 04, 2024 04:17:23 PM
유익한 웹 사이트를 게시하는 데 아주 좋습니다. 웹 로그는 유용 할뿐만 아니라 창의적이기도합니다.
Feb 04, 2024 04:39:03 PM
유익한 웹 사이트를 게시하는 데 아주 좋습니다. 웹 로그는 유용 할뿐만 아니라 창의적이기도합니다.
Feb 04, 2024 05:07:49 PM
흠 !! 이 블로그는 정말 멋져요. 정말 운이 좋아 여기에 도달해서 멋진 정보를 얻었습니다
Feb 04, 2024 05:31:54 PM
흠 !! 이 블로그는 정말 멋져요. 정말 운이 좋아 여기에 도달해서 멋진 정보를 얻었습니다
Feb 04, 2024 05:58:06 PM
흠 !! 이 블로그는 정말 멋져요. 정말 운이 좋아 여기에 도달해서 멋진 정보를 얻었습니다
Feb 04, 2024 07:06:39 PM
유익한 웹 사이트를 게시하는 데 아주 좋습니다. 웹 로그는 유용 할뿐만 아니라 창의적이기도합니다.
Feb 04, 2024 08:03:44 PM
흠 !! 이 블로그는 정말 멋져요. 정말 운이 좋아 여기에 도달해서 멋진 정보를 얻었습니다
Feb 05, 2024 09:26:08 PM
흠 !! 이 블로그는 정말 멋져요. 정말 운이 좋아 여기에 도달해서 멋진 정보를 얻었습니다
Feb 06, 2024 03:51:43 PM
아주 좋은 블로그 게시물. 다시 한 번 감사드립니다. 멋있는.
Feb 08, 2024 06:47:41 PM
흠 !! 이 블로그는 정말 멋져요. 정말 운이 좋아 여기에 도달해서 멋진 정보를 얻었습니다
Nov 28, 2024 06:22:44 PM
오랫동안 나와 내 친구는 유익한 블로그를 찾고 있었지만 지금은 올바른 위치에 있습니다. 당신은 내 마음에 방을 만들었습니다!
Nov 30, 2024 07:19:30 PM
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