1.设置管理员root密码为123
开启MySQL服务后
PS C:WINDOWSsystem32> 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:WINDOWSsystem32> mysql -uroot -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
2.更改密码
PS C:WINDOWSsystem32>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:WINDOWSsystem32> 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:WINDOWSsystem32> mysqld --skip-grant-tables
3.3再次登录时无需输入密码
PS C:WINDOWSsystem32> 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:WINDOWSsystem32> tasklist |findstr mysql
mysqld.exe 11452 Services 0 173,284 K
PS C:WINDOWSsystem32> 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:WINDOWSsystem32> net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。
PS C:WINDOWSsystem32> 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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