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113 lines
2.1 KiB
Markdown
113 lines
2.1 KiB
Markdown
## 简介
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MySQL 是一个开源的关系型数据库管理系统。
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- 官网: <https://www.mysql.com/>
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- 源码: <https://dev.mysql.com/downloads/file/?id=482483>
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- 文档: <https://dev.mysql.com/doc/refman/5.6/en>
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- 开源: <https://github.com/mysql/mysql-server>
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## 下载安装
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### Ubuntu安装MySQL
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安装服务器与客户端
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```
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sudo apt-get install mysql-server mysql-client
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```
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相关目录与文件
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- 配置目录 /etc/mysql/
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- 运行状态 /var/run/mysqld/
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- 日志目录 /var/log/mysql/
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- 数据目录 /var/lib/mysql/
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- 其它文件 /var/lib/mysql-files/
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- 动态插件 /usr/lib/mysql/plugin/
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## 基础命令
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初次登录，直接用安装时设置的密码连接
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```
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$ mysql -u root -p
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Enter password
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mysql>
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```
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查看帮助信息
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```
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mysql> help
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...
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```
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其中常用的命令有
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- status 查看当前状态
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- system 调用系统shell命令
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- source 加载并执行sql文件
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- delimiter 设置行分隔符
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- connect 重新连接服务器
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- use 切换数据库
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### 数据库操作
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- 查看 show databases
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- 切换 use demo
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- 创建 create database demo
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- 删除 drop database demo
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查看数据库列表
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```
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mysql> show databases;
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```
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创建数据库
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```
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mysql> create database demo;
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```
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切换数据库
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```
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mysql> use demo;
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```
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删除数据库
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```
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mysql> drop database demo;
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```
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### 关系表操作
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- 创建 create table demo(a int)
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- 修改 alter table add column b int
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- 删除 drop table demo
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### 数据操作
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- 查询 select * from demo
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- 添加 insert into demo values(1,2)
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- 修改 update demo set a=1, b=2 where a=3
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- 删除 delete from demo where a=1
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## 存储引擎
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### InnoDB
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### MyISAM
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- 下载: <https://dev.mysql.com/downloads/mysql/5.6.html#downloads>
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- 博客: <http://blog.codinglabs.org/articles/theory-of-mysql-index.html>
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变量的定义与引用: <https://www.cnblogs.com/EasonJim/p/7966918.html>
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show engines
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show engine innodb status
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show variables
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show databases
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create database demo
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drop database demo
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use demo
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show tables
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create table t(a int unsigned not null, b char(10), primary key(a))
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drop table t
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select * from t;
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insert into t values()
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update t set b='1234'
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delete from t
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