mysql颠覆实战笔记(七)--白话理解事务

时间:2023-03-08 17:31:22

今天我们学习web开发级mysql颠覆实战课程第9课没MYSQL事务(一):白话理解事务。前面有两节课7讲:商品系统设计(四):商品属性设计之自定义属性,第8讲:商品系统设计(五):一维属性的商品价格表设计的笔记本人省略,没有原因,个人爱好。

  所谓事务,用老师白话理解就是:

  1、不止要执行一个步骤。2、这些步骤每一步都按照既定想法去执行,错一步那么整个过程都反悔。3、事务进行时,外界干扰无法影响。

  这算是老师的一个基础讲解,首先我们来建一张用户余额表,这个表我们采用的是Innodb模式,在这个模式下每个步骤其实都是一个事务。下面是余额表user_balance:

  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" 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  为了演示方便,我们插入几条数据

  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" alt="" />

  下面我们使用

show VARIABLES like '%COMMIT%'

  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" alt="" />

  我们从上面的查询结果可以看到,autocommit (自动提交) 的VALUE值是ON。

  下面我们就根据课程内容进行测试,具体内容我就不记笔记了,以实践为主。

上一课:mysql颠覆实战笔记(六)--商品系统设计(三):商品属性设计之固定属性