MySQL错误：access denied for user 'root'@'localhost' using password yes的问题

本来mysql运行得好好的，修改了一次root密码，貌似没成功，当时也没在意，mysql也没出问题。到了第二天，启动时报了这个错误“access denied for user 'root'@'localhost' using password yes”。网上解决的方法很多，试了几个都不行，下面就贴出自己实践成功后的方法，

以下内容根据论坛“http://topic.csdn.net/u/20090515/21/2b3c9a12-d8a5-4bb1-9895-6069cef5aef8.html”整理，使得解决方法有个更清晰的步骤.

1.停止Mysql的服务：c:\>sc?stop?mysql（net stop mysql/net start mysql）

2.首先进入windows命令行模式，本人的mysql安装在D盘，切换到mysql bin目录下。命令格式如下:cd D:/mysql/bin

然后敲下面的粗体的命令。注意你的my.ini位置。

D:/MySQL\bin>mysqld??--defaults-file="D:\MySQL\\my.ini"?--console?--skip-grant-tables
090515?22:06:09?[Warning]?The?syntax?'--log'?is?deprecated?and?will?be?removed?i
n?MySQL?7.0.?Please?use?'--general_log'/'--general_log_file'?instead.
090515?22:06:09?[Warning]?The?syntax?'--log_slow_queries'?is?deprecated?and?will
?be?removed?in?MySQL?7.0.?Please?use?'--slow_query_log'/'--slow_query_log_file'
instead.
090515?22:06:09?[Warning]?The?syntax?'--log'?is?deprecated?and?will?be?removed?i
n?MySQL?7.0.?Please?use?'--general_log'/'--general_log_file'?instead.
090515?22:06:09?[Warning]?The?syntax?'--log_slow_queries'?is?deprecated?and?will
?be?removed?in?MySQL?7.0.?Please?use?'--slow_query_log'/'--slow_query_log_file'
instead.
090515?22:06:09?[ERROR]?The?update?log?is?no?longer?supported?by?MySQL?in?versio
n?5.0?and?above.?It?is?replaced?by?the?binary?log.?Now?starting?MySQL?with?--log
-bin=''?instead.
090515?22:06:09??InnoDB:?Started;?log?sequence?number?0?324221
090515?22:06:09?[Note]?mysqld:?ready?for?connections.
Version:?'5.1.33-community-log'??socket:?''??port:?3306??MySQL?Community?Server
(GPL)

看到这个结果就说明MySQL已经起来了。

3.再打开一个dos窗口，同样切换到bin目录下

D:\MySQL\bin>mysql -uroot mysql ?显示结果如下：

Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 2 ?Server version: 5.1.33-community-log MySQL Community Server (GPL) ???Type 'help;' or '\h' for help. Type '\c' to clear the buffer. ?

4.继续下面这个步骤，输入：

mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root'; ? ?mysql> FLUSH PRIVILEGES; ? ?mysql> quit ? ??进入到mysql的bin路径，输入D:\mysql\bin>mysql -uroot -penter password:“新密码”密码设置成功。