下载安装

根据链接https://downloads.mysql.com/archives/community/下载并安装MySQL5.7.21

配置环境变量

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cd ~
vim ./.bash_profile
# 进入.bash_profile后添加PATH
export PATH=$PATH:/usr/local/mysql/bin 
export PATH=$PATH:/usr/local/mysql/support-files
source ~/.bashrc

从系统偏好设置中开启MySQL服务并修改

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# 打开终端，通过命令查看进程
ps aux | grep mysql
# 打开MySQL Client
mysql -u root -p
# 输入初始密码
# 修改密码
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('root');
# 刷新缓存
FLUSH PRIVILEGES;
# 退出
exit

MySQL服务的启停和状态的查看

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# 停止MySQL服务 
sudo mysql.server stop 

# 重启MySQL服务 
sudo mysql.server restart 

# 查看MySQL服务状态 
sudo mysql.server status

MySQL卸载

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# 1. 停掉MySQL服务
sudo /Library/StartupItems/mysqlCOM/mysqlCOM stop

# 2. 删除残留文件
sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /var/db/receipts/com.mysql.*