事务控制——注解@Transactional

注解@Transactional

常用的注解有两个，一个是spring的，一个是java本身的
org.springframework.transaction.annotation.Transactional
javax.transaction.Transactional
这两个在使用上基本没什么区别，只是属性名称稍有不同
rollback的默认类为RuntimeException和Error，隔离级别默认为数据源的隔离级别，传播行为默认为REQUIRE
下面以spring的注解使用为例

	/**
	 * @return 无事务
	 * @throws Exception 
	 */
	@Transactional
	public void save1() throws Exception {
		User user = new User();
		user.setName("user1");
		transationalRepository.save(user);
		throw new Exception();
	}

	/**
	 * @return 有事务
	 */
	@Transactional(rollbackFor=Exception.class)
	public void save2() throws Exception {
		User user = new User();
		user.setName("user2");
		transationalRepository.save(user);
		throw new Exception();
	}

	/**
	 * @return 有事务
	 */
	@Transactional
	public void save3() throws Exception{
		User user = new User();
		user.setName("user3");
		transationalRepository.save(user);
		throw new RuntimeException();
	}

	/**
	 * @return 无事务
	 */
	@Override
	public void save4() {
		save_4();
	}
	
	/**
	 * @return 有事务
	 * @throws Exception 
	 */
	@Transactional
	public void save5() throws Exception {
		User user = new User();
		user.setName("user5");
		transationalRepository.save(user);
		save3();
	}
	

    /**
	 * @return 有事务
	 * @throws Exception 
	 */
	@Transactional
	public void save6() throws Exception {
		save_6();
		throw new RuntimeException();
	}


	/**
	 * @return test 
	 */
	@Transactional
	public void save_4() {
		User user = new User();
		user.setName("user4");
		transationalRepository.save(user);
		throw new RuntimeException();
	}

	/**
	 * @return test 
	 */
	@Transactional
	public void save_6(){
		User user = new User();
		user.setName("user6");
		transationalRepository.save(user);
	}