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mysql 常用命令学习

Jun 07, 2016 pm 03:02 PM
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我知道大家的mysql 命令已经很好了,但是我是个初学者,发现了自己不知道的东西,很兴奋,所以我记录我所学习的经过!!! 在cmd中输入命令时,需要在命令后面添加“;”,也就是一个分号,这个分号表示命令的结束,然后回车才会这行,不然的话mysql认为你的

       我知道大家的mysql 命令已经很好了,但是我是个初学者,发现了自己不知道的东西,很兴奋,所以我记录我所学习的经过!!!

在cmd中输入命令时,需要在命令后面添加“;”,也就是一个分号,这个分号表示命令的结束,然后回车才会这行,不然的话mysql认为你的命令还没用写完,所以你的命令一直都在等待而不能执行;

       show命令:找出相关的查找信息,比如:show databases; 找出服务器上所有的数据库show tables,查看当前的数据库存在什么表。

       create命令:创建表或者数据库,比如:create database mydata  创建出数据库mydata,create table mytable(name  VARCHAR(20))创建了一个表,并且将他的数据类型写到括号里面,完成了创建,

use命令:在服务器中有多个数据库,需要转换数据库的时候使用,比如:use mysql(上面刚才建立的数据库)

 describe命令:查看详细信息,这个命令不适用于database ,如果你使用describe mydata 会出现错误,比如:describe  table;

insert 命令:插入命令,比如:insert  into mytable values ("benben");

load命令:这个命令是使用外部的文件将数据插入到数据库中,比如:load   data local infile "D:/mysql.txt" into table mytable ;

source命令:这个命令是导入.sql文件时使用的,在使用这个命令的时候我们需要先进入你需要导入的数据库,然后再导入命令。比如:use database ; source  "D:/mysql.sql"

drop 命令:这个命令是删除, 比如:drop table mytable;

delete 命令:这个命令是清空,比如:delete from mytable;

updata命令:更新的命令,比如:updata mytable set set="x" where name="benben";

下面是一些常用的命令:

net  start mysql 打开Windows的mysql 服务

net stop mysql 关闭Windows的mysql服务

修改root用户的密码,在安装好了mysql的时候,服务器为我们提供了一个root用户,并且密码是空,便于我们使用,但是在后面的开发中我们的安全性都需要有保障,所以我们从新设定root用户的密码;

use mysql;

delete from User where user="";

update User set Password=PASSWORD("newPassword")  where user="root"

数据库的相关权限问题,等有时间在进行学习吧!!!(这里是一个知识债务)


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