支持传播的 Spring 事务
我想了解 Spring 事务与传播支持的用途。 java 文档提到，如果从事务中调用具有 @Transactional(propagation = Propagation.SUPPORTS) 的方法，则它支持该事务，但如果不存在事务，则该方法将以非事务方式执行。
这不是 Spring 事务的行为，与 Propagation.SUPPORTS 无关吗？
public class ServiceBean {
@Transactional(propagation = Propagation.SUPPORTS)
public void methodWithSupportsTx() {
//perform some database operations
}
}
public class OtherServiceBean {
@Transactional(propagation = Propagation.REQUIRED)
public void methodWithRequiredTx() {
//perform some database operations
serviceBean.methodWithSupportsTx();
}
}
在上面的代码示例中，无论 methodWithSupportsTx() 是否具有 @Transactional(propagation = Propagation.SUPPORTS) 注解，它都会在事务中执行，具体取决于 methodWithRequiredTx() 有 @Transactional 注释，对吧？
那么传播级别支持的需要/用途是什么？
I would like to understand the use of having a spring transaction with Propagation Supports. The java docs mention that if the method which has @Transactional(propagation = Propagation.SUPPORTS) is called from within a transaction it supports the transaction but if no transaction exists, the method is executed non-transactionally.
Isn't this already the behavior of spring transactions irrespective of Propagation.SUPPORTS?
public class ServiceBean {
@Transactional(propagation = Propagation.SUPPORTS)
public void methodWithSupportsTx() {
//perform some database operations
}
}
public class OtherServiceBean {
@Transactional(propagation = Propagation.REQUIRED)
public void methodWithRequiredTx() {
//perform some database operations
serviceBean.methodWithSupportsTx();
}
}
In the above code example, irrespective of whether methodWithSupportsTx() has @Transactional(propagation = Propagation.SUPPORTS) annotation it would be executed in a transaction depending on whether methodWithRequiredTx() has @Transactional annotation, right?
So what's the need/use of having a propagation level SUPPORTS?
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来自 javadoc：
因此，这意味着，例如，在
methodWithSupportsTx()内多次调用 Hibernate 的SessionFactory.getCurrentSession()将返回相同的会话。From javadoc:
So, it means that, for example, multiple invocations of Hibernate's
SessionFactory.getCurrentSession()insidemethodWithSupportsTx()would return the same session.如果不存在所需的事务，则将创建一个新事务。因此，当您调用 serviceBean.methodWithSupportsTx() 时，将进行一个新事务。如果你的方法确实是事务性的，如果不存在事务，你将会看到来自 spring 的错误。
A required transaction will create a new transaction if none exists. Therefore a new transaction would be made when you call serviceBean.methodWithSupportsTx(). If your method is truly transactional you will see an error from spring if no transaction exists.