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原创 【无标题】

例如我们在使用JDBC操作数据库时,在提交事务方法后,提示用户事务操作完成,当我们程序执行完成直到看到提示后,就可以认定事务以及正确提交,即使这时候数据库出现了问题,也必须要将我们的事务完全执行完成,否则就会造成我们看到提示事务处理完毕,但是数据库因为故障而没有执行事务的重大错误。然后我发现转错人了,回滚了事物。对于第二类事物丢失,也称为覆盖丢失,就是A和B一起执行一个数据,两个同时取到一个数据,然后B事物首先提交,但是A事物加下来又提交,这样就覆盖了B事物,称为第二类事物丢失,覆盖丢失。

2023-06-28 11:11:38 24

原创 2020-11-26

工作今天工作复习三部 10建自己的表 30跑SP 30Update sql 60明白主要逻辑 60找BMViewTable主键 30

2020-11-26 11:14:45 56 1

原创 家庭生活_公开

--------------------------------------------------------------------------------------------------------买空调--如何选购https://zhuanlan.zhihu.com/p/99896887----一些考量--买前要考虑房间的大小,几匹,能效1级和3急,平均每8小时多耗电2.1度陆济南说他家冬天前后最多各开10天,夏天就开了几天而已精确控温: 不支持精准控温,0.5和1度的差别

2020-06-21 17:00:46 187

原创 A股券商信息

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2020-06-21 16:58:52 220

原创 阿拉斯加

Shell 教程Shell 是一个用 C 语言编写的程序,它是用户使用 Linux 的桥梁。Shell 既是一种命令语言,又是一种程序设计语言。Shell 是指一种应用程序,这个应用程序提供了一个界面,用户通过这个界面访问操作系统内核的服务。Ken Thompson 的 sh 是第一种 Unix Shell,Windows Explorer 是一个典型的图形界面 Shell。She...

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