安装
brew install mysql

对mysql进行初始化操作
mysql_secure_installation

$ mysql_secure_installation
 
Securing the MySQL server deployment.
 
Connecting to MySQL using a blank password.
 
VALIDATE PASSWORD PLUGIN can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
secure enough. Would you like to setup VALIDATE PASSWORD plugin?
 // 这个选yes的话密码长度就必须要设置为8位以上，但我只想要6位的
Press y|Y for Yes, any other key for No: N   
Please set the password for root here.
 
New password:            // 设置密码
 
Re-enter new password:     // 再一次确认密码
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. This is intended only for
testing, and to make the installation go a bit smoother.
You should remove them before moving into a production
environment.
 // 移除不用密码的那个账户
Remove anonymous users? (Press y|Y for Yes, any other key for No) : Y    
Success.
 
 
Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network.
 //是否禁止远程登录
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : n
 
 ... skipping.
By default, MySQL comes with a database named 'test' that
anyone can access. This is also intended only for testing,
and should be removed before moving into a production
environment.
 
 // 是否删除test库
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y
 - Dropping test database...
Success.
 
 - Removing privileges on test database...
Success.
 
Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.
 
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y
Success.
 
All done!

登陆mysql：mysql -u root -p
启动mysql：brew services start mysql
停止mysql：brew services stop

若安装过mysql应先stop mysql

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