Home Database Mysql Tutorial MySQL数据库的实际应用步骤

MySQL数据库的实际应用步骤

Jun 07, 2016 pm 04:11 PM
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以下的文章我们要讲述的是MySQL数据库(和PHP搭配之最佳组合) 安装好了之后的正确使用方法。此文章主要是从连接 MySQL(和PHP搭配之最佳组合)、修改密码与增加用户等相关方面来学习一些 MySQL(和PHP搭配之最佳组合) 的常用命令。 一、连接MySQL(和PHP搭配之最

以下的文章我们要讲述的是MySQL数据库(和PHP搭配之最佳组合) 安装好了之后的正确使用方法。此文章主要是从连接 MySQL(和PHP搭配之最佳组合)、修改密码与增加用户等相关方面来学习一些 MySQL(和PHP搭配之最佳组合) 的常用命令。

一、连接MySQL(和PHP搭配之最佳组合)。

格式: MySQL(和PHP搭配之最佳组合) -h主机地址 -u用户名 -p用户密码

1、例1:连接到本机上的MySQL(和PHP搭配之最佳组合)。

首先在打开 DOS 窗口,然后进入目录 MySQL(和PHP搭配之最佳组合)\bin,再键入命令MySQL(和PHP搭配之最佳组合) -uroot -p,回车后提示你输密码,如果刚安装好 MySQL(和PHP搭配之最佳组合),超级用户 root 是没有密码的,故直接回车即可进入到 MySQL(和PHP搭配之最佳组合) 中了,MySQL数据库(和PHP搭配之最佳组合) 的提示符是:MySQL(和PHP搭配之最佳组合)>

2、例2:连接到远程主机上的 MySQL(和PHP搭配之最佳组合)。

假设远程主机的IP为:110.110.110.110,用户名为root,密码为abcd123。则键入以下命令:

MySQL(和PHP搭配之最佳组合) -h110.110.110.110 -uroot -pabcd123

(注:u与root可以不用加空格,其它也一样)

3、退出 MySQL(和PHP搭配之最佳组合) 命令: exit (回车)

格式:MySQL(和PHP搭配之最佳组合)admin -u用户名 -p旧密码 password 新密码

1、例1:给root加个密码ab12。首先在DOS下进入目录MySQL数据库(和PHP搭配之最佳组合)bin,然后键入以下命令

MySQL(和PHP搭配之最佳组合)admin -uroot -password ab12

注:因为开始时root没有密码,所以-p旧密码一项就可以省略了。

2、例2:再将root的密码改为djg345。

MySQL(和PHP搭配之最佳组合)admin -uroot -pab12 password djg345

三、增加新用户。

(注意:和上面不同,下面的因为是 MySQL(和PHP搭配之最佳组合) 环境中的命令,所以后面都带一个分号作为命令结束符)

格式:grant select on 数据库.* to 用户名@登录主机 identified by "密码"

例1、增加一个用户 test1 密码为 abc,让他可以在任何主机上登录,并对所有数据库有查询、插入、修改、删除的权限。首先用以 root 用户连入 MySQL(和PHP搭配之最佳组合),然后键入以下命令:

grant select, insert, update, delete on *.* to test1@"%" Identified by "abc";

但例1增加的用户是十分危险的,你想如某个人知道test1的密码,那么他就可以在internet上的任何一台电脑上登录你的MySQL(和PHP搭配之最佳组合)数据库并对你的数据可以为所欲为了,解决办法见例2。

例2、增加一个用户test2密码为abc,让他只可以在localhost上登录,并可以对数据库 mydb进行查询、插入、修改、删除的操作(localhost指本地主机,即MySQL(和PHP搭配之最佳组合)数据库所在的那台主机),这样用户即使用知道test2的密码,他也无法从internet上直接访问数据库,只能通过MySQL数据库(和PHP搭配之最佳组合)主机上的web页来访问了。

grant select, insert, update,delete on mydb.* to test2@localhost identified by "abc";

如果你不想test2有密码,可以再打一个命令将密码消掉。

grant select, insert, update, delete on mydb.* to test2@localhost identified by "";

 

二、修改密码。


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