MYSQ-更改密码总结
1、对原始密码的更改：
mysql> update user set password=password('w123123') where user='root';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0
mysql> quit
Bye
测试：
C:\Documents and Settings\Administrator>mysql --protocol=pipe -uroot -p
Enter password: *******
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.25-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| #mysql50#bin-log |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.03 sec)
mysql> quit
Bye
2、若忘记密码了，要更改登陆，方法如下：
需要两CMD窗口：
第一个：
C:\Documents and Settings\Administrator>mysqld --skip-grant-tables
开启后就可以了
第二个：
空密码进入
C:\Documents and Settings\Administrator>mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.25-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| #mysql50#bin-log |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.09 sec)
mysql> use mysql
Database changed
mysql> update user set password=password('w111') where user='root'
-> ;
Query OK, 3 rows affected (0.06 sec)
Rows matched: 3 Changed: 3 Warnings: 0
mysql> quit
Bye
也可以加入（
mysql> flush privileges;
执行改操作）
关闭：第一个窗口，最主要的是停止了mysqld进程（在任务管理器中查看是否存在）
重启mysql服务：
带密码登陆
C:\Documents and Settings\Administrator>mysql -u root -p
Enter password: ****
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.25-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| #mysql50#bin-log |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.05 sec)
mysql>
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| #mysql50#bin-log |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.05 sec)
mysql>
这样更改密码成功！！！
3、mysqladmin修改密码：
C:\Documents and Settings\Administrator>mysqladmin -u root -p password w123123
Enter password: ****
测试：
C:\Documents and Settings\Administrator>mysql -uroot -p
Enter password: *******
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.5.25-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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>
注意：这个是mysql本身就有密码！！！这是需要 -p 参数！！
如果本身mysql没有密码：
则：
C:\Documents and Settings\Administrator>mysqladmin -u root
password w123123
注意两者的区别！！！