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

最近新装好的mysql在进入mysql工具时，总是有错误提示:
# mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
或者
# mysql -u root -p password 'newpassword'
Enter password:
mysqladmin: connect to server at 'localhost' failed

error: 'Access denied for user 'root'@'localhost' (using password: YES)'

现在终于找到解决方法了。本来准备重装的，现在不必了。
方法操作很简单，如下：

# /etc/init.d/mysqld stop //停止mysql服务的运行
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking & //跳过受权表访问
# mysql -u root mysql //登录mysql

在mysql5.7以下的版本如下：
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root' and host='127.0.0.1' or host='localhost';//把空的用户密码都修改成非空的密码就行了。

在mysql5.7版本如下：

update mysql.user set authentication_string=password('newpassword') where user='root' and host='127.0.0.1' or host='localhost';

mysql> FLUSH PRIVILEGES;
mysql> quit # /etc/init.d/mysqld restart //离开并重启mysql
# mysql -uroot -p
Enter password: <输入新设的密码newpassword>

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