windows重置mysql 中root@localhost的密码

问题:先前在mysql数据库里通过本机建了一个数据库,里面还有些表。后来不知怎么回事登陆的时候用show databases结果只有两个数据库:performance_schema 和test,那个mysql数据库和自己之前新建的那个库都不见了。如果新建库时出这样的错误

ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'xxx'


查到要重置root@localhost的密码
现将方法记录如下:

首先net stop mysql  停止mysql服务


然后打开cmd ,cd到你的MySQL bin目录下。 比如我的是 C:\Program Files\MySQL\MySQL Server 5.1\bin
然后敲下面的粗体的命令。注意你的my.ini位置(用户配置文件)。
输入 mysqld  --defaults-file="C:\Program Files\MySQL\MySQL Server 5.1\my.ini" --console --skip-grant-tables
出现:
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)


再开一个DOS窗口,同样切到mysql bin目录下,执行mysql -uroot mysql
显示: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.

mysql>


然后开始设置新密码:
mysql> UPDATE user SET Password=PASSWORD(’这里填你的新密码’) where USER=’root’; 
mysql> FLUSH PRIVILEGES; 
mysql> quit 
然后重新启动服务就行了。



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