Mac OS X下完全卸载MySQL的方法

sudo rm -rf /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
sudo nano /etc/hostconfig     (复制前面部分回车，然后删掉这一行: MYSQLCOM=-YES-，control+O回车保存，control+X退出编辑界面)(从 Yosemite 开始，/etc/hostconfig 这个文件已经移除，所以 Yosemite 后的系统可以忽略本行)
sudo 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.*