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<>前言
事务是mysql Innodb引擎的一大特点,可以说,在日常开发中,对于mysql事务的使用无处不在,因此深入了解并掌握mysql的事务原理很有必要。
<>一、mysql事务简介
* 事务 是一组操作集合,一个不可分割的工作单位;
* 事务会将所有操作作为一个整体,一起向系统提交或撤销操作请求,这些操作要么同时成功,要么同时失败;
比如 : 张三给李四转账1000块钱,张三银行账户减少1000元,而李四银行账户的钱要增加1000元。
这一组操作就必须在一个事务的范围内,要么都成功,要么都失败
<>二、事务四大特性
是事务的四大特性,简称ACID
* 原子性(Atomicity):事务是不可分割的最小操作单元,要么全部成功,要么全部失败;
* 一致性(Consistency):事务完成时,必须使所有的数据都保持一致状态;
* 隔离性(Isolation):数据库系统提供的隔离机制,保证事务在不受外部并发操作影响的独立环境下运行;
* 持久性(Durability):事务一旦提交或回滚,它对数据库中的数据的改变就是永久的;
<>三、事务案例演示
下面来模拟一个事务操作,准备如下一张表,