1.brew search mysql
2.brew install mysql@5.7
3.装好输入mysql -u root，提示mysql: command not found！
则查找mysql安装在哪:find / -name "mysql":
sypdeMacBook-Pro:~ syp$ find / -name "mysql"
find: /usr/sbin/authserver: Permission denied
/usr/local/var/mysql
/usr/local/var/mysql/mysql
/usr/local/Cellar/mysql@5.7/5.7.25/bin/mysql
/usr/local/Cellar/mysql@5.7/5.7.25/include/mysql
/usr/local/Cellar/mysql@5.7/5.7.25/include/mysql/mysql
/usr/local/Cellar/mysql@5.7/5.7.25/share/mysql
这个是mysql的所在位置：/usr/local/Cellar/mysql@5.7/5.7.25/bin/mysql
4.sudo vim /etc/profile ，在最后一行添加：
export PATH=$PATH:/usr/local/Cellar/mysql@5.7/5.7.25/bin
5.source /etc/profile 表示设置立即生效
6.mysql -uroot
7.use mysql;
8.update user set authentication_string=password('123456') where user='root';
9.flush privileges;
10.exit;
