详解Spring事务回滚的两种方法

@Service
@Transactional
public class UserServiceImpl implements UserService {
    @Override
    public void save(User user) {
        //some code
        //db operation
    }
}

@Service
@Transactional(rollbackFor = Exception.class)
public class UserServiceImpl implements UserService {
    @Resource
	private UserMapper userMapper;
    @Override
    public void save(User user) {
        userMapper.insert(user);
        throw new RuntimeException(); // 抛出异常，事务回滚，上面的insert插入失败。
    }
}

@Service
public class UserServiceImpl implements UserService {
   @Autowired
   private DataSourceTransactionManager transactionManager;
   @Override
   @Transactional
   public void save(User user) {
       DefaultTransactionDefinition def = new DefaultTransactionDefinition();
       // explicitly setting the transaction name is something that can only be done programmatically
       def.setName("SomeTxName");
       def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
       TransactionStatus status = transactionManager.getTransaction(def);
       try {
           // execute your business logic here
           //db operation
       } catch (Exception ex) {
           transactionManager.rollback(status);
           throw ex;
       }
   }
} // 此代码案例来自Alibaba Coding Guidelines