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【面试真题拆解15】什么是事务?

  • 2026-04-19 10:29:10
【面试真题拆解15】什么是事务?

之前面试的时候还真的有一个面试官问过我:

什么是事务?

事务,说人话就是:

多个数据库操作打包成一个“不可分割的整体”,要么全成功,要么全失败并回滚到最初状态,绝对不会出现“只做了一半”的情况。

以生活中最经典的银行转账举个例子那是再合适不过了。

且看:

A给B转100块钱,这一笔转账业务,其实是由两步独立的数据库操作组成的:

  1. 1. A的账户扣100块
  2. 2. B的账户加100块

这两步必须同时成功、一起生效。

如果A扣了钱B没收到,或者B收到了钱A没扣,那银行就乱套了。

事务的四大特性

用银行转账的例子加深理解:

特性
解释
银行转账例子
原子性(Atomicity)
要么全做,要么全不做,就像“原子”一样不可分割
A扣钱和B加钱必须同时成功,不能A扣了B没加
一致性(Consistency)
事务前后,数据要保持“一致”,总金额不变
转账前A有1000,B有0,总和是1000;转账后A有900,B有100,总和还是1000
隔离性(Isolation)
多个事务同时执行时,互相不干扰,就像“隔离开”一样
两个转账操作同时改A的账户,不能互相影响,不然钱就不对了
持久性(Durability)
事务提交后,数据就永久保存了,就算数据库挂了也不会丢
转账成功后,就算银行服务器断电重启,A和B的钱数也不会变

隔离级别

为什么要有隔离级别呢?

如果多个事务同时执行,没有隔离的话,会出现3个问题:

  1. 1. 脏读

脏读就是读到了别人还没提交的数据。

比如A转给B100块,还没提交,B就查到自己多了100块,结果A回滚了,B白高兴一场。

  1. 2. 不可重复读

不可重复读的意思是同一个事务里,两次读同一条数据的结果是不一样的。

比如A查自己有1000块,中间B转给了A100块提交了,A再查就变成1100了。

  1. 3. 幻读

幻读就是同一个事务里,两次查的数量不一样。

比如A查账户里有10条记录,中间B插了一条提交了,A再查就变成11条了,就像“幻觉”一样。

这么看,不可重复读幻读才是由别的事务提交后导致的错误,而脏读是读到了别人还没提交的临时数据。

那不可重复读和幻读两者的区别在哪呢?

不可重复读是盯着一条记录看,发现这条记录的内容变了。

而幻读是盯着一堆记录数看,发现总数量变了。

类比一下就是不可重复读是你看自己的银行卡余额,钱数变了;而幻读是你数银行有多少张卡,卡的数量变了。

隔离级别
解决的问题
解释
读未提交(Read Uncommitted)
啥都解决不了
能读到别人没提交的数据,脏读、不可重复读、幻读都有,一般不用
读已提交(Read Committed)
脏读
只能读到别人提交后的数据,但会有不可重复读、幻读
可重复读(Repeatable Read)
脏读、不可重复读
Spring默认的隔离级别。同一个事务里,两次读同一个数据一样,但会有幻读(MySQL InnoDB用MVCC解决了幻读)
串行化(Serializable)
所有问题
事务一个接一个执行,就像“排队”一样,性能最差,一般不用

传播行为

传播行为就是:

当一个事务方法调用另一个事务方法时,这两个事务该怎么协作?是直接加入原事务?还是新建一个独立的事务?还是先挂起原事务,等新事务执行完再继续?

以下是3 个常用的传播行为:

传播行为
解释
适用场景
REQUIRED(默认)
有事务就加入,没有就新建一个事务
最常用,比如转账服务
REQUIRES_NEW
新建一个事务,挂起原事务,等新事务执行完再继续原事务
比如记录日志,不管主事务成功失败,日志都要记录
NESTED
嵌套事务,有一个保存点:1. 子事务回滚:只回滚自己,不影响父事务和其他子事务2. 父事务回滚:带着所有子事务一起回滚
系统批量发福利:某一个用户的福利发放失败,不影响其他用户;但整体回滚,所有用户的福利都会被收回

小贴士

  1. 1. Spring AOP 是基于代理的,@Transactional 只能用在 public 方法上,不然不生效。不管是 JDK 动态代理还是 CGLIB 代理,Spring 都只保证 public 方法的事务生效,非 public 的写了也白写。
  2. 2. 内部调用不会走代理类,直接调用this.method(),所以,同一个类里方法调用,@Transactional不生效。
  3. 3. Spring默认只回滚非受检异常(RuntimeException、Error),受检异常(Exception)不回滚。如果要所有异常都回滚,需要在 @Transactional 里加rollbackFor = Exception.class
  4. 4. MySQL的MyISAM引擎不支持事务,只有InnoDB支持。

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  1. CONNECT:[ UseTime:0.001085s ] mysql:host=127.0.0.1;port=3306;dbname=no_15386;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001635s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000776s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006474s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001475s ]
  6. SELECT * FROM `set` [ RunTime:0.000666s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001546s ]
  8. SELECT * FROM `article` WHERE `id` = 464884 LIMIT 1 [ RunTime:0.001081s ]
  9. UPDATE `article` SET `lasttime` = 1776652551 WHERE `id` = 464884 [ RunTime:0.012561s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000605s ]
  11. SELECT * FROM `article` WHERE `id` < 464884 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001135s ]
  12. SELECT * FROM `article` WHERE `id` > 464884 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001109s ]
  13. SELECT * FROM `article` WHERE `id` < 464884 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001901s ]
  14. SELECT * FROM `article` WHERE `id` < 464884 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001792s ]
  15. SELECT * FROM `article` WHERE `id` < 464884 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002592s ]
0.201620s