只要了解Spring事务的工作，我想知道在以下情况下会发生什么，一个标记为@Transactional的方法调用另一个标记为@Transactional的方法。

假设配置使用所有默认设置。

@Service("myService")

@Transactional

public MyService{

public void myServiceMethod(){

myDAO.getSomeDBObjects();

}

}

@Repository("myDAO")

@Transactional

public MyDAOWithUsesBeyondMyService{

public void getSomeDBObjects(){...}

}

现在如果我要输入MyService.myServiceMethod()，它将显然启动一个事务。那么在钻入myDAO.getSomeDBObjects()会发生什么？事实已经存在的事实不会导致新的交易出生，还是我在这里创建两个交易？

传播中的文档(引用如下)似乎涵盖了这一点，但是我想验证我的理解，对于我的处女大脑来了解一下，这是一个很大的一部分。

Propagation: Typically, all code

executed within a transaction scope

will run in that transaction. However,

you have the option of specifying the

behavior in the event that a

transactional method is executed when

a transaction context already exists.

For example, code can continue running

in the existing transaction (the

common case); or the existing

transaction can be suspended and a new

transaction created. Spring offers all

of the transaction propagation options

familiar from EJB CMT. To read about

the semantics of transaction

propagation in Spring, see Section

10.5.7, “Transaction propagation”.