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MySQL数据库命令的基础简介

Jun 07, 2016 pm 04:09 PM
mysqlmainOrderBasedatabasearticleIntroduction

以下的文章主要是对MySQL数据库命令的基础的详细解析,我们首先是以显示MySQL数据库的基本信息开始的,来对MySQL数据库命令的基础进行一个详细的解析,以下就是文章的具体内容的描述。 显示MySQL基本信息: MySQL status; 查看变量: showvariableslike'%ver

以下的文章主要是对MySQL数据库命令的基础的详细解析,我们首先是以显示MySQL数据库的基本信息开始的,来对MySQL数据库命令的基础进行一个详细的解析,以下就是文章的具体内容的描述。

显示MySQL基本信息:

<ol class="dp-xml"><li class="alt"><span><span>MySQL</span><span class="tag">></span><span>status; </span></span></li></ol>

查看变量:

<ol class="dp-xml"><li class="alt"><span><span>show variables like '%version%'; </span></span></li></ol>

备份与还原MySQL数据库命令:在最后还有

1.备份MySQL数据库的命令:

在cmd中进入到MySQL的lib目录下执行如下:

<ol class="dp-xml"><li class="alt"><span><span>MySQLdump -hhostname -uusername -ppassword databaseName </span><span class="tag">></span><span> backupfile.sql </span></span></li></ol>

例:

MySQLdump -hlocalhost -uroot -p123456 test > test.sql

2.导出一个表:

MySQLdump -u 用户名 -p 数据库名 表名> 导出的文件名

<ol class="dp-xml"><li class="alt"><span><span>MySQLdump -u root -p dataname users</span><span class="tag">></span><span> dataname_users.sql </span></span></li></ol>

还原MySQL数据库的MySQL数据库命令:

首先新建一个数据库:create database 数据库;

然后进入数据库:use 数据库名;

然后执行sql脚本:MySQL>source d:\aaa.sql;

完成

帮助MySQL数据库命令:进入lib目录下MySQLdump -help

注:如果配置了环境变量就不用进入lib下就可以直接运行

连接MySQL

先执行MySQL安装目录下的MySQLd.exe启动服务

进入MySQL管理界面

MySQL -h localhost -u root -p

-h 主机名 -u用户名 -p 密码

修改密码。

格式:MySQLadmin -u用户名 -p旧密码 password 新密码

MySQLadmin -u root -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。

再将root的密码改为123456。

显示所有数据库

<ol class="dp-xml"><li class="alt"><span><span>show databases; </span></span></li></ol>

建立一个新库

<ol class="dp-xml">
<li class="alt"><span><span>create database new;  </span></span></li>
<li><span>drop database if exists school;  </span></li>
</ol>

如果存在SCHOOL则删除

使用这个数据库

<ol class="dp-xml"><li class="alt"><span><span>use new; </span></span></li></ol>

MySQL数据库命令:建立新表

<ol class="dp-xml">
<li class="alt"><span><span>create table app_user(  </span></span></li>
<li><span>username varchar(20),  </span></li>
<li class="alt"><span>password varchar(255),  </span></li>
<li><span>primary key(username)); </span></li>
</ol>

显示表结构

<ol class="dp-xml"><li class="alt"><span><span>describe app_user;/desc app_user; </span></span></li></ol>

显示所有表

<ol class="dp-xml"><li class="alt"><span><span>show tables; </span></span></li></ol>

插入测试数据

<ol class="dp-xml">
<li class="alt"><span><span>insert into app_user values('tomcat' , '123');  </span></span></li>
<li><span>insert into app_user values('yeeku' , '123'); </span></li>
</ol>

退出MySQL管理界面

<ol class="dp-xml"><li class="alt"><span><span>exit/quit;  </span></span></li></ol>

以上的相关内容就是对MySQL数据库基础的介绍,望你能有所收获。


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