Hibernate-事务处理总结

 

Attribute name	Description	中文
REQUIRED	A method must be invoked with a transaction context. If the client doesn’t have a transaction context, the container starts a transaction and enlists all resources (datasources, and so on) used with that transaction. If this method calls other transactional components, the transaction is propagated. The container commits the transaction when the method returns, before the result is send to the client.	方法调用的时候必须有事务。如果client没有事务上下文，系统自动开始一个事务包括（datasource等）如果这个方法还调用其他方法，事务将延伸到其他方法。但方法结束的时候，事务将自动结束。
NOT_SUPPORTED	If a method is invoked within the transaction context propagated from the client, the caller’s transaction is suspended and reactivated when the method returns. If the caller has no transaction context, no transaction is started for the method. All used resources aren’t enlisted with a transaction (autocommit occurs).	如果这个方法在事务里，这事务被挂起，但这个方法返回后reactive。如果没有事务，事务不会发生
SUPPORTS	If a method is invoked within the transaction context propagated from the client, it joins that transaction context with the same result as REQUIRED. If the caller has no transaction context, no transaction is started, with the same result as NOT_SUPPORTED. This transaction attribute type should be used only for methods that can handle both cases correctly.	如果这个方法在事务里，它将加入事务就像required一样。如果没有事务就像not-supported一样，不产生事务
REQUIRES_NEW	A method is always executed inside a new transaction context, with the same consequences and behavior as with REQUIRED. Any propagated client transaction is suspended and resumes when the method returns and the new transaction is completed.	但方法被执行总是开一个新事物里，它就像required一样。但如果有事务在前，会被挂起，等这个事务completed以及方法返回后，重新恢复。
MANDATORY	A method must be called with an active transaction context. It then joins this transaction context and propagates it further, if needed. If no transaction context is present at call time, an exception is thrown.	这个方法必须被一个active的事务调用，如果没有事务，他就报错
NEVER	This is the opposite of MANDATORY. An exception is thrown if a method is called with an active transaction context.	与mandatory相反，如果有事务他就报错