MySQL

安装

Docker

docker run --name <mysql> -v <local/path>:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=<password>

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docker run -p 3306:3306 --name mysql \
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-v ~/data/mysql:/var/lib/mysql \
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-e MYSQL_ROOT_PASSWORD=password \
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-d mysql

mysql.yml|Docker Compose

Synology

通过注册表下载完成后，从映像启动；
高级设置
- 存储空间: ==/docker/mysql== -> ==/var/lib/mysql==
- 端口设置: 64406 -> 3306
- 环境: ==MYSQL_ROOT_PASSWORD== -> <密码>

macOS

安装：brew install mysql
启动：brew services start mysql
设置：mysql_secure_installation
连接：mysql -u root -p

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sunyichaodeMacBook-Pro:~ sunyichao$ /usr/local/opt/mysql/bin/mysql_secure_installation # mysql 提供的配置向导
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Press y|Y for Yes, any other key for No: k # 是否采用mysql密码安全检测插件
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Remove anonymous users? [Y/n] Y # 是否删除匿名用户
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Disallow root login remotely? [Y/n] Y # 是否禁止远程登录
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Remove test database and access to it? [Y/n] Y # 删除测试数据库，并登录
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Reload privilege tables now? [Y/n] Y# 重新载入权限表

CentOS

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  # 下载源
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  wget https://repo.mysql.com/mysql57-community-release-el7-9.noarch.rpm
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  # 安装源
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  yum localinstall mysql57-community-release-el7-9.noarch.rpm
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  # 安装 MySQL
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  yum install mysql-community-server -y
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  # 启动 MySQL
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  systemctl start mysqld
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  # 设为开机启动
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  systemctl enable mysqld
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  # 查看密码
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  grep password /var/log/mysqld.log
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  # 登录
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  mysql -u root -p
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  # 修改密码
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  ALTER user '用户名'@'%' IDENTIFIED BY '新密码';
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  # 配置文件修改 /etc/my.cnf
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  [mysqld]
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  character_set_server = utf8 # 设置字符集
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  port = 64406 # 修改默认端口

连接

命令行连接: mysql -h <ip> -P <port> -u <name> -p

操作

修改密码

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-- 关联 mysql 数据库
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USE mysql;
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-- 查看用户名和host
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SELECT user, host from user;
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SELECT host, user, authentication_string, plugin from user;
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-- 查看密码策略
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SHOW VARIABLES LIKE 'validate_password.%'
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-- 修改密码
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ALTER user 'root'@'localhost' IDENTIFIED BY 'password';
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-- 设置密码检测强度，默认 MEDIUM
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set global validate_password.policy = 'LOW';
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-- RDS MySQL 5.7 修改密码
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ALTER user '用户名'@'%' IDENTIFIED BY '新密码';
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-- RDS MySQL 5.6 修改密码（后台）
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use mysql;
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UPDATE user SET PASSWORD=PASSWORD("新密码") WHERE user='用户名';
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flush privileges;

创建账号

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-- '%' - 所有情况都能访问
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-- ‘localhost’ - 本机才能访问
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-- '127.0.0.1'
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CREATE USER 'user1'@'%' IDENTIFIED BY '07fa533360d9';
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-- 添加权限
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-- all 可以替换为 select,delete,update,create,drop
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grant all privileges on 想授权的数据库.* to 'user1'@'%';
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-- 刷新
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flush privileges;

授权

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GRANT ALL PRIVILEGES ON *.* TO ‘root’@’127.0.0.1’ WITH GRANT OPTION;
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grant all on hi.* to 'user4'@'%';
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-- 取消指定库所有权限
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revoke all privileges ON lscloud.* from 'lscloud'@'%';
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-- 设定指定列授权
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grant select (paytype) ON lscloud.ecsmonitor to 'lscloud'@'%';
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-- 取消指定列授权
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revoke select (paytype) ON lscloud.ecsmonitor from 'lscloud'@'%';
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-----------------------
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-- 获取数据指定日期内所有数据
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select ecsinfo.departmentName, ecsinfo.projectName, ecsinfo.cpu, ecsinfo.memory, ecsinfo.privateIpAddress, ecsinfo.eipAddress, ecsmonitor.memoryUtilization, ecsmonitor.cpuUtilization, ecsmonitor.updateTime from ecsinfo join ecsmonitor on ecsinfo.instanceId = ecsmonitor.instanceId AND ecsmonitor.updateTime > "2020-11-30";

结束进程

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SHOW PROCESSLIST; #查看当前进程
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KILL id; # 结束指定进程

当锁表的时候可以尝试把对应进程都结束掉。

删除

删除表中指定日期外的数据

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DELETE FROM logs WHERE created_at < NOW() - INTERVAL 7 DAY

删除指定项目所有数据

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DELETE
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FROM
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  ecsmonitor
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WHERE
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  projectName = "报名系统";

搜索

模糊搜索和全文搜索

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-- 模糊搜索
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SELECT
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  *
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FROM
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  ecsmonitor
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WHERE
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  instanceName LIKE '%项目%';
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-- 全文搜索
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-- 建立索引：index_ecsmonitor 索引名，ecsmonitor 表名，instanceName 字段名
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CREATE FULLTEXT INDEX index_ecsmonitor ON ecsmonitor ( instanceName ) WITH PARSER ngram;
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-- 搜索
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SELECT
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  *
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FROM
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  ecsmonitor
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WHERE
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  MATCH ( instanceName ) AGAINST ( '项目' IN NATURAL LANGUAGE MODE );

查看数据库大小

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SELECT
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  table_schema AS '数据库',
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  sum( table_rows ) AS '记录数',
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  sum(
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  TRUNCATE ( data_length / 1024 / 1024, 2 )) AS '数据容量(MB)',
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  sum(
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  TRUNCATE ( index_length / 1024 / 1024, 2 )) AS '索引容量(MB)'
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FROM
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  information_schema.TABLES
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GROUP BY
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  table_schema
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ORDER BY
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  sum( data_length ) DESC,
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  sum( index_length ) DESC;

定时执行任务

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CREATE EVENT test -- 任务名
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ON SCHEDULE EVERY 1 DAY -- 执行周期
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DO -- 需执行的语句

在原值基础上修改值

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UPDATE <table name> SET image_url= CONCAT('result/',image_url)

报错

ModuleNotFoundError: No module named ‘mysql’

pip 安装：

pip install mysql-connector-python

Authentication plugin ‘caching_sha2_password’ is not supported

pip 安装

mysql-connector-python, 而非 mysql-connector