shell 中调用 mysql 操作
#!/bin/bash
#删除100个数据库中的1000个表的过期数据
DBHOST="127.0.0.1"
DBPWD="pwd"
DBUSER="root"
MYSQLBIN="/usr/local/mysql/bin/mysql"
for((dbindex = 0;dbindex < 100;dbindex++))
do
for((tabindex = 0;tabindex < 10;tabindex++))
do
if [ $dbindex -lt 10 ]; then
del="delete from gs_map_0${dbindex}.t_${tabindex}";
else
del="delete from gs_map_${dbindex}.t_${tabindex}";
fi
del=${del}" where Fcreate_time < UNIX_TIMESTAMP() - 86400"
bin=`${MYSQLBIN} -u${DBUSER} -p${DBPWD} -h${DBHOST} -e"${del}"`
$bin
#echo ${bin}
#echo $del >>/tmp/aaa.txt
sleep 5
done
done
#crontab configure
# 0 3 * * * clear.sh > /dev/null 2>&1
相关文档：
1、编辑MySQL配置文件：
windows环境中：%MySQL_installdir%\my.ini //一般在MySQL安装目录下有my.ini即MySQL的配置文件。
linux环境中：/etc/my.cnf
在[MySQLd]配置段添加如下一行：
skip-grant-tables
保存退出编辑。
2、然后重启MySQL服务
windows环境中：
net stop MySQL
net start MySQL
linux环境中：
/e ......
E:\databases\MySQL\MySQL Server 5.1\bin>mysqldump --help
mysqldump Ver 10.13 Distrib 5.1.30, for Win32 (ia32)
By Igor Romanenko, Monty, Jani & Sinisa
This software comes with ABSOLUTELY NO WARRANTY. This is free softwa
and you are welcome to modify and redistribute it under the GPL ......
先按照下面的表结构创建mysql_order_by_test数据表，我们用实例一点一点告诉你，MySQL order by的用法。
ORDER BY uid ASC
按照uid正序查询数据，也就是按照uid从小到大排列
ORDER BY uid DESC
按照uid逆序查询数据，也就是按照uid从大到小排列
我们来看
SELECT * from mysql_order_by_test OR ......
1.建表过程如下
create database test default character set utf8 collate utf8_general_ci
use test;
create table devicedata
(
ID int auto_increment PRIMARY key ,
TimeStamp datetime,
Device_Name varchar(100),
Tag_Name varchar(100),
Value varchar(50)
)
2 ......
