MySQL忘记密码解决

1.设置管理员root密码为123

开启mysql服务后

ps c:\windows\system32> mysqladmin -uroot -p password "123"
enter password:
mysqladmin: [warning] using a password on the command line interface can be insecure.
warning: since password will be sent to server in plain text, use ssl connection to ensure password safety.
#直接回车，忽略上述提示

再次登录不输入密码，出现一下结果。

ps c:\windows\system32> mysql -uroot -p
enter password:
error 1045 (28000): access denied for user 'root'@'localhost' (using password: no)

2.更改密码

ps c:\windows\system32>mysqladmin -uroot -p"123" password "456"  #修改mysql密码,因为已经有密码了，所以必须输入原密码才能设置新密码

3.忘记密码

3.1关闭mysql服务器

ps c:\windows\system32> net stop mysql
mysql 服务正在停止.
mysql 服务已成功停止。

3.2跳过授权表

ps c:\windows\system32> mysqld --skip-grant-tables

3.3再次登录时无需输入密码

ps c:\windows\system32> mysql -uroot -p
enter password:
welcome to the mysql monitor.  commands end with ; or \g.
your mysql connection id is 2
server version: 5.7.27 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 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.

3.4更改密码为'abc'

mysql> update mysql.user set authentication_string =password('abc') where user='root';
query ok, 1 row affected (0.01 sec)
rows matched: 1  changed: 1  warnings: 0

3.5刷新权限后退出

mysql> flush privileges;
query ok, 0 rows affected (0.00 sec)

mysql> exit
bye

3.6关闭mysql进程

ps c:\windows\system32> tasklist |findstr mysql
mysqld.exe                   11452 services                   0    173,284 k
ps c:\windows\system32> taskkill /f /pid 11452
成功: 已终止 pid 为 11452 的进程。

3.7再次开启服务，使用新密码登录

ps c:\windows\system32> net start mysql
mysql 服务正在启动 .
mysql 服务已经启动成功。

ps c:\windows\system32>  mysql -uroot -p
enter password: ***
welcome to the mysql monitor.  commands end with ; or \g.
your mysql connection id is 2
server version: 5.7.27 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 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.

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