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定时 MySQL 动作-Linux下用Cron现定时执行脚本

Jun 07, 2016 pm 04:56 PM
mysql

有的我们希望在指定时间运行数据库的相关操作,如果这些在WEB前台来执行将会非常浪费服务器资源,因为网页需要不停的刷新继而判断

有的我们希望在指定时间运行数据库的相关操作,如果这些在WEB前台来执行将会非常浪费服务器资源,,因为网页需要不停的刷新继而判断时间来执行操作。。。

我是用的这样的方法

1. 在/etc 创建一个目录 crond.my

2.编辑/etc/crontab

分 小时 天 月 星期 root run-parts /etc/cron.my

3. 在cron.my中创建delete_table_msg.sh

内容如下:
/usr/local/MySQL/bin/MySQL -hlocalhost -uroot -pwowangle

上边为什么要下MySQL的绝对路径?因为我的MySQL是自己编译的,而这个MySQL命令并没有在crontab的PATH中存在.
请看一下/etc/crontab文件的PATH就完全明白了!
有的时候时候定时脚本没有运行就请选查看你的命令是否在path当中!

那个job.sql当中就是要执行的sql语句

!(题外话了)
你要对SQL有更多的了解!才会能完成更多的任务!所以SQL很重要!对WEB开发人员更是如此,我不相信一个用DW的可以成为什么优秀的WEB程序人员,如是你只是会简单的select * from table 这样类似的语句那你和我一样也该好好反醒一下了!

我的这个A.SQL中是如下内容
<br>use xfcz;<br>delete from t;<br>

看就这么两条简单的语句,因为这个T表中的数据在每天固定的一个时间是必须全部清除的
发挥你的想象力,重头戏就在这个sql当中......

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