【Mac MySql异常】Bug 1045 (28000): Access denied to user 'root'@'localhost' on MAC OSX (use password: no) (ERROR 1045 (28000):

　　1、清除本地MySql相关　　

　　重装Mysql之前先删除本地MySql的相关文件。

sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/MySQL*
vim /etc/hostconfig and removed the line MYSQLCOM=-YES-
rm -rf ~/Library/PreferencePanes/MySQL*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /var/db/receipts/com.mysql.*

　　也可以直接在设置偏好设置里面执行Uninstall，记得在弹窗中，勾选清楚相关文件

　　2、安装MySql　　

$ brew services stop mysql
$ pkill mysqld
$ rm -rf /usr/local/var/mysql/ # NOTE: this will delete your existing database!!!
$ brew postinstall mysql
$ brew services restart mysql
$ mysql -uroot