@Transactional(传播=传播.需要)
如果有人能解释这个注释的作用以及我们何时使用它:
if some one can explain what this annotation do and when exactly we use it :
@Transactional(propagation=Propagation.REQUIRED)
谢谢
推荐答案
当传播设置为 PROPAGATION_REQUIRED 时，将为应用该设置的每个方法创建一个逻辑事务范围.每个这样的逻辑事务范围可以单独确定仅回滚状态，外部事务范围在逻辑上独立于内部事务范围.当然，在标准 PROPAGATION_REQUIRED 行为的情况下，所有这些范围都将映射到同一个物理事务.因此，在内部事务范围内设置的仅回滚标记确实会影响外部事务实际提交的机会(正如您所期望的那样).
When the propagation setting is PROPAGATION_REQUIRED, a logical transaction scope is created for each method upon which the setting is applied. Each such logical transaction scope can determine rollback-only status individually, with an outer transaction scope being logically independent from the inner transaction scope. Of course, in case of standard PROPAGATION_REQUIRED behavior, all these scopes will be mapped to the same physical transaction. So a rollback-only marker set in the inner transaction scope does affect the outer transaction's chance to actually commit (as you would expect it to).
http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/transaction.html
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