Mac - MySQL初始密码忘记重置MySQL root密码

在什么情况下，需要重置root密码呢？那就是我们忘记了。还有一种比较坑的，那就是笔者的这种情况。按照正常的情况下，MySQL安装完之后，会弹出一个对话框，显示着一个临时的root密码，但无论笔者如何重装MySQL，始终不给我一个临时的root的密码，导致笔者一直无法登陆MySQL，没办法，只能用硬的，那就是重置密码。

停止MySQL的服务，打开系统的偏好设置，找到MySQL 进去后，点击Stop MySQL Server即可。

step1：
苹果->系统偏好设置->最下边点mysql 在弹出页面中 关闭mysql服务（点击stop mysql server）
step2：
进入终端输入：cd /usr/local/mysql/bin/
回车后 登录管理员权限 sudo su
回车后输入以下命令来禁止mysql验证功能 ./mysqld_safe --skip-grant-tables &
回车后mysql会自动重启（偏好设置中mysql的状态会变成running）

开启两个终端，在第一个终端输入sudo /usr/local/mysql/bin/mysqld_safe --skip-grant-tables，输入当前用户的密码:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

那么就换下面这种：

macdeMacBook-Pro:~ mac$ mysql -uroot -h127.0.0.1 -p
Enter password: 
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

然后在第二个终端输入sudo /usr/local/mysql/bin/mysql -u root，然后输入当前用户的密码后，出现以下的界面

macdeMacBook-Pro:~ mac$ sudo /usr/local/mysql/bin/mysql -u root
Password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.22 Homebrew

Copyright (c) 2000, 2018, 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> 

然后输入命令 UPDATE mysql.user SET authentication_string=PASSWORD('新密码') WHERE User='root';回车，出现以下的界面，说明修改成功。

mysql> UPDATE mysql.user SET authentication_string=PASSWORD('123456') WHERE User='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1

 

接下来输入FLUSH PRIVILEGES;回车，出现下面的界面

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)

 

最后，输入\q，退出。关闭第一个终端，回到系统的偏好设置，重新开启MySQL即可。

mysql> \q
Bye

macdeMacBook-Pro:~ mac$ mysql -uroot -h127.0.0.1 -p
Enter password: 
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
macdeMacBook-Pro:~ mac$ sudo /usr/local/mysql/bin/mysql -u root
Password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.22 Homebrew

Copyright (c) 2000, 2018, 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> UPDATE mysql.user SET authentication_string=PASSWORD('123456') WHERE User='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)

mysql> \q
Bye
macdeMacBook-Pro:~ mac$