【Error】 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

mysql 登录输入密码有时会碰到如题的错误。

错误描述：

Error 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) 

解决方法：

# /etc/init.d/mysql stop
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
# mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root' and host='root' or host='localhost';//把空的用户密码都修改成非空的密码就行了。
mysql> FLUSH PRIVILEGES;
mysql> quit
# /etc/init.d/mysqld restart
# mysql -uroot -p
Enter password: <输入新设的密码newpassword>