/**      * 开启事务      */     public void beginTransaction() {         try {             connectionUtils.getThreadConnection().setAutoCommit(false);         } catch (Exception e) {             e.printStackTrace();         }     }    public void transfer(String sourceName, String targetName, Float money) {          try {             //开启事务             transactionManager.beginTransaction();              //执行操作             //根据名称分别查询到转入转出的账户             Account source = accountDao.findAccountByName(sourceName);             Account target = accountDao.findAccountByName(targetName);              //转入转出账户加减             source.setBalance(source.getBalance() - money);             target.setBalance(target.getBalance() + money);              //更新转出转入账户             accountDao.updateAccount(source);             //模拟转账异常             int num = 100 / 0;             accountDao.updateAccount(target);              //提交事务             transactionManager.commit();          } catch (Exception e) {             //回滚操作             transactionManager.rollback();             e.printStackTrace();         } finally {             //释放连接             transactionManager.release();         }     } 

跟着博客敲的代码，实现了转账的功能，抛出异常后调用了回滚方法，但是异常之前提交修改的数据仍然发生了改变，数据库引擎为 innodb，请问下怎么解决？ https://i.imgur.com/tNorCDi.png https://i.imgur.com/NLeb1Wk.png https://i.imgur.com/7ia1Ntx.png

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