三种修改root用户密码的方式:

方法一: 使用set password命令

首先登录MySQL,使用mysql自带的客户端连接mysql,命令如:mysql -uroot -p

会提示你输入当前root密码,默认为空,直接回车就可以了.

格式: mysql> set password for 用户名@localhost=password('新密码');

例子: mysql> set password for root@localhost=password('666');

这里password('666')中的password会自动进行加密.

方法二:使用mysqladmin 执行管理操作的客户端程序

格式: C:\Users\Administrator>mysqladmin -u用户名 -p旧密码 password 新密码

例子: C:\Users\Administrator>mysqladmin -uroot -p666 password 新密码(也可以不输入,直接回车,提示的时候再输入,这样会安全些,别人无法通过dos下的doskey/history查看到你的新密码)

如下面的例子中的Warning: Using a password on the command line interface can be insecure. 就是安全提示

C:\Users\Administrator>mysqladmin -uroot -p666 passwordWarning: Using a password on the command line interface can be insecure.New password: ***Confirm new password: ***

C:\Users\Administrator>doskey/history (查看历史记录命令)mysql -uroot -pmysqladmin -uroot -p666 passworddoskey/history

方法三: update直接修改mysql库中的user表

mysql> update user set password=password('888') where user='root';Query OK, 2 rows affected (0.00 sec)Rows matched: 3  Changed: 2  Warnings: 0

mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)

----------------------------------------------------------------忘记root密码,怎么办?----------------------------------------------------------------

这里需要重启mysqld服务端

C:\Users\Administrator>net stop mysqldmysqld 服务正在停止.mysqld 服务已成功停止。

C:\Users\Administrator>mysqld --skip-grant-tables  (跳过用户认证权限表)2019-06-18 10:54:24 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).2019-06-18 10:54:24 0 [Note] --secure-file-priv is set to NULL. Operations related to importing and exporting data are disabled2019-06-18 10:54:24 0 [Note] mysqld (mysqld 5.6.44) starting as process 2004 ...

重新打开一个dos窗口

C:\Users\Administrator>mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.6.44 MySQL Community Server (GPL)

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || oldboydb           || performance_schema || test               |+--------------------+5 rows in set (0.01 sec)

mysql> use mysql;Database changedmysql> update user set password=password('666') where user='root';Query OK, 0 rows affected (0.00 sec)Rows matched: 3  Changed: 0  Warnings: 0

mysql> flush privileges;Query OK, 0 rows affected (0.01 sec)

mysql> quit;Bye

C:\Users\Administrator>tasklist | findstr mysqlmysqld.exe                    2004 Console                    1    454,756 K

C:\Users\Administrator>taskkill /F /PID 2004成功: 已终止 PID 为 2004 的进程。

C:\Users\Administrator>net start mysqldmysqld 服务正在启动 .mysqld 服务已经启动成功。