我刚刚在Mac OS x上安装了MySQL，下一步是设置root用户密码，所以我接下来这样做:
启动终端应用程序以访问Unix命令行。
在Unix提示符下，我执行了以下命令:
cd /usr/local/mysql/bin
./mysqladmin -u root password' password'
但是，当我执行命令时
./mysql -u root，这是答案:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 224
Server version: 5.5.13 MySQL Community Server (GPL)
Copyright (c) 2000, 2010, 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>
我不需要密码就能进入mysql命令行!
为什么会这样?
停止MySQL服务器
sudo /usr/local/mysql/support-files / mysql。服务器停止
以安全模式启动MySQL
Sudo /usr/local/mysql/bin/mysqld_safe——skip-grant-tables &
修改root用户密码
/usr/local/mysql/bin/mysql -u root
use mysql;
UPDATE user SET authentication_string=PASSWORD('NEW_PASSWORD') WHERE user='root';
FLUSH PRIVILEGES;
exit
测试
执行/usr/local/mysql/bin/mysql -u root命令
现在输入新密码开始使用MySQL。
如果您不记得设置的root密码，需要重置密码，请执行以下步骤:
Stop the mysqld server, this varies per install
Run the server in safe mode with privilege bypass
sudo mysqld_safe --skip-grant-tables;
In a new window connect to the database, set a new password and flush the permissions & quit:
mysql -u root
For MySQL older than MySQL 5.7 use:
UPDATE mysql.user SET Password=PASSWORD('your-password') WHERE User='root';
For MySQL 5.7+ use:
USE mysql;
UPDATE mysql.user SET authentication_string=PASSWORD("your-password") WHERE User='root';
Refresh and quit:
FLUSH PRIVILEGES;
\q
Stop the safe mode server and start your regular server back. The new password should work now. It worked like a charm for me :)
Note
运行
更新mysql。SET authentication_string=null WHERE user ='root';
如果您不想为root用户设置密码。或者PASSWORD()函数不适合您。
如果你忘记了MySQL的根密码，不记得或者想要闯入.....你可以在Linux或OS X的命令行中重置MySQL数据库密码，只要你知道你所在的机器的root用户密码:
(1)停止MySQL
sudo /usr/local/mysql/support-files/mysql.server stop
(2)安全模式启动:
sudo mysqld_safe --skip-grant-tables
(3)这将是一个持续的命令，直到进程结束，所以打开另一个shell/终端窗口，登录没有密码:
mysql -u root
UPDATE mysql.user SET Password=PASSWORD('password') WHERE User='root';
在上面的UPDATE命令中，只需将'password'替换为您自己的新密码，请确保保留引号
(4)节省和安静
FLUSH PRIVILEGES;
\q
启动MySQL
sudo /usr/local/mysql/support-files/mysql.server start
MySQL 8有了很大的变化。我发现MySQL 8.0“如何重置根密码”文档的以下修改适用于Mac OS X。
创建一个临时文件$HOME/mysql.root.txt，用SQL更新根密码:
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '<new-password>';
这使用mysql_native_password来避免身份验证插件'caching_sha2_password'无法加载错误，如果我省略该选项，我就会得到这个错误。
停止服务器，使用——init-file选项来设置根密码，然后重新启动服务器:
mysql.server stop
mysql.server start --init-file=$HOME/mysql.root.txt
mysql.server stop
mysql.server start
