MySQL忘记密码怎么重置

1打开mysql.exe和mysqld.exe所在的文件夹,复制路径地址

输入命令  mysqld --skip-grant-tables  回车，此时就跳过了mysql的用户验证。注意输入此命令之后命令行就无法操作了，此时可以再打开一个新的命令行。注意：在输入此命令之前先在任务管理器中结束mysqld.exe进程，确保mysql服务器端已结束运行。

输入mysql登陆

 C:\Users\Administrator>mysql
 Welcome to the MySQL monitor.  Commands end with ; or \g.
 Your MySQL connection id is
 Server version: 5.5. MySQL Community Server (GPL)
 Copyright (c) , , Oracle and/or its affiliates. All rights reserved.
 Oracle is a registered trademark of Oracle Corporation and/or its
 affiliates. Other names may be trademarks of their respective
 owners.
 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 mysql>

 mysql> show databases;
 +--------------------+
 | Database           |
 +--------------------+
 | information_schema |
 | itcastoa0720       |
 | kingoa             |
 | mysql              |
 | performance_schema |
 | qin                |
 | student            |
 | test               |
 +--------------------+
  rows in set (0.01 sec)

 mysql> use mysql
 Database changed
 mysql> show tables;
 +---------------------------+
 | Tables_in_mysql           |
 +---------------------------+
 | columns_priv              |
 | db                        |
 | event                     |
 | func                      |
 | general_log               |
 | help_category             |
 | help_keyword              |
 | help_relation             |
 | help_topic                |
 | host                      |
 | ndb_binlog_index          |
 | plugin                    |
 | proc                      |
 | procs_priv                |
 | proxies_priv              |
 | servers                   |
 | slow_log                  |
 | tables_priv               |
 | time_zone                 |
 | time_zone_leap_second     |
 | time_zone_name            |
 | time_zone_transition      |
 | time_zone_transition_type |
 | user                      |
 +---------------------------+
  rows in set (0.01 sec)

 mysql> select user,host,password from user;
 +------+-----------+-------------------------------------------+
 | user | host      | password                                  |
 +------+-----------+-------------------------------------------+
 | root | localhost | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
 +------+-----------+-------------------------------------------+
  row in set (0.00 sec)

 mysql> update user set password=password('') where user='root' and host='l
 ocalhost';
 Query OK,  row affected (0.00 sec)
 Rows matched:   Changed:   Warnings: 

 mysql> select user,host,password from user;
 +------+-----------+-------------------------------------------+
 | user | host      | password                                  |
 +------+-----------+-------------------------------------------+
 | root | localhost | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
 +------+-----------+-------------------------------------------+
  row in set (0.00 sec)

 mysql>

重新打开一个cmd命令窗口，测试

 C:\Users\Administrator>mysql -u root -p123456
 Welcome to the MySQL monitor.  Commands end with ; or \g.
 Your MySQL connection id is
 Server version: 5.5. MySQL Community Server (GPL)

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

 Oracle is a registered trademark of Oracle Corporation and/or its
 affiliates. Other names may be trademarks of their respective
 owners.

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

 mysql>