1.点击mysql5.7下载
2.安装完成后：（记住最后一步分配的初始密码）
3.启动：可以在偏好设置中start/stop，亦可通过命令
sudo /usr/local/mysql/support-files/mysql.server start
sudo /usr/local/mysql/support-files/mysql.server stop
sudo /usr/local/mysql/support-files/mysql.server restart
4.简化启动命令：
A. touch .bash_profile
B.在打开的profile中添加以下内容
alias mysqlstart="sudo /usr/local/mysql/support-files/mysql.server start"
alias mysqlstop="sudo /usr/local/mysql/support-files/mysql.server stop"
alias mysqlrestart="sudo /usr/local/mysql/support-files/mysql.server restart"
C.source .bash_profile
D.通过 mysqlstart启动 mysqlstop停止 mysqlrestart 重启
5.如果忘记初始分配密码，请执行以下操作
sudo /usr/local/mysql/support-files/mysql.server stop
cd /usr/local/mysql/bin/
sudo su
./mysqld_safe --skip-grant-tables &
到此mysql的状态应该是running
./mysql
FLUSH PRIVILEGES;
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('新密码');
