编程式事务配置 

@Transactional方式

直接在service方法加入注释即可 

@Transactional    public int txUpdateUsersWhenException() {         Merchant merchant=new Merchant();        merchant.setId(1);        merchant.setEnName("333");        int affectedCount = super.update(merchant);        System.out.println(affectedCount );        int i = 1 / 0; // 抛出运行时异常，事务回滚        return 0;    }

TransactionTemplate方式

@Autowired(required = false)TransactionTemplate txTemplate;public int txUpdateUsersWhenExceptionViaTxTemplate() {	int retVal = txTemplate.execute(new TransactionCallback
    
     () {		@Override		public Integer doInTransaction(TransactionStatus status) { // 事务操作			User user = new User(9, "Before exception");			int affectedCount = mapper.updateUser(user); // 因后面的异常而回滚			User user2 = new User(10, "After exception");			int i = 1 / 0; // 抛出运行时异常并回滚			int affectedCount2 = mapper.updateUser(user2); // 未执行			if (affectedCount == 1 && affectedCount2 == 1) {				return 1;			}			return 0;		}			});	return retVal;}