如何设置mysql root密码

如何设置mysql root密码：


1、首次安装 root初始密码为空，注意就是没有密码，直接敲回车即可进入
D:\wamp\bin\mysql\mysql5.6.17\bin> mysql -uroot -p
Enter password:  [直接回车]
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.6.17 MySQL Community Server (GPL)


Copyright (c) 2000, 2014, 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>


2、修改root密码的几种方法：
1） 用SET PASSWORD命令
　　首先登录MySQL。
　　格式：mysql> set password for 用户名@localhost = password('新密码');

　　例如：

mysql> set password for root@localhost = password('root');
Query OK, 0 rows affected (0.00 sec)


mysql> quit
Bye


D:\wamp\bin\mysql\mysql5.6.17\bin> mysql -uroot -proot
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 5.6.17 MySQL Community Server (GPL)


Copyright (c) 2000, 2014, 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>　


2）用mysqladmin
　　格式：mysqladmin -u用户名 -p旧密码 password 新密码
　　例如：
D:\wamp\bin\mysql\mysql5.6.17\bin> mysqladmin -uroot -proot password root123
Warning: Using a password on the command line interface can be insecure.


D:\wamp\bin\mysql\mysql5.6.17\bin> mysql -uroot -proot123
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 5.6.17 MySQL Community Server (GPL)


Copyright (c) 2000, 2014, 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>


3）用UPDATE直接编辑user表
　　首先登录MySQL。
　　 mysql> use mysql;
　　mysql> update user set password=password('root') where user='root' and host='localhost';
　　mysql> flush privileges;
--注意一定要flush privileges;
mysql 新设置用户或更改密码后需用flush privileges刷新MySQL的系统权限相关表，否则会出现拒绝访问，还有一种方法，就是重新启动mysql服务器，来使新设置生效。


4）在忘记root密码的时候，可以这样。
　　以windows为例：
　　1. 关闭正在运行的MySQL服务。
　　2. 打开DOS窗口，转到mysql\bin目录。
　　3. 输入mysqld --skip-grant-tables 回车。--skip-grant-tables 的意思是启动MySQL服务的时候跳过权限表认证。
　　4. 再开一个DOS窗口（因为刚才那个DOS窗口已经不能动了），转到mysql\bin目录。
　　5. 输入mysql回车，如果成功，将出现MySQL提示符 >。
　　6. 连接权限数据库： use mysql; 。
　　6. 改密码：update user set password=password('root123') where user='root';（别忘了最后加分号） 。
　　7. 刷新权限（必须步骤）： flush privileges;　
　　8. 退出quit当前cmd，并且关闭2中的DOS窗口

　　9. 使用用户名root，新密码root123在4中DOS窗口登录。

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Dylan    Presents.