mac环境下手动卸载mysql
1.sudo rm /usr/local/mysql
2.sudo rm -rf /usr/local/mysql*
3.sudo rm -rf /Library/StartupItems/MySQLCOM
4.sudo rm -rf /Library/Perferences/My*
5.vim /etc/hostconfig (remove the line MYSQLCOM=-YES-)
6.rm -rf ~/Library/PerferencePanes/My*
7.sudo rm -rf /Library/Receipts/mysql*
8.sudo rm -rf /Library/Receipts/MySQL*
9.sudp rm -rf /var/db/receipts/com.mysql.*