mysql数据库基本操作三_MySQL

环境：msyql版本5.0，windows操作系统

mysqladmin命令修改密码

034039->123456

C:/Users/ASUS>mysqladmin -u root -p034039 password 123456C:/Users/ASUS>mysql -u root -p123456Welcome to the MySQL monitor.  Commands end with ; or /g.Your MySQL connection id is 32Server version: 5.0.96-community-nt MySQL Community Edition (GPL)Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql>

大坑：

这条语句C:/Users/ASUS>mysqladmin -u root -p123456 password '034039';

其实新的密码为'034039'; 

也就是说单引号被解释为密码的一部分

你说坑不坑

C:/Users/ASUS>mysqladmin -u root -p123456 password '034039';C:/Users/ASUS>mysql -u root -p'034039'ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)C:/Users/ASUS>mysql -u root -p'034039';Welcome to the MySQL monitor.  Commands end with ; or /g.Your MySQL connection id is 35Server version: 5.0.96-community-nt MySQL Community Edition (GPL)Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql>

类似的有

C:/Users/ASUS>mysqladmin -u root -p'034039'; password "123456"C:/Users/ASUS>mysql -u root -p"123456"Welcome to the MySQL monitor.  Commands end with ; or /g.Your MySQL connection id is 37Server version: 5.0.96-community-nt MySQL Community Edition (GPL)Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql> Ctrl-C -- exit!Bye

现在mysql的密码是什么？其实是123456，不带双引号

则：

C:/Users/ASUS>mysqladmin -u root -p034039 password "123456"C:/Users/ASUS>mysql -u root -p123456Welcome to the MySQL monitor.  Commands end with ; or /g.Your MySQL connection id is 44Server version: 5.0.96-community-nt MySQL Community Edition (GPL)Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql>Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statemenmysql>

也就是说在Windows中，一定要使用双引号，双引号不会被解释为密码的一部分。当密码中有空格时，要使用双引号

如果密码输错了就会出现这样的错误：

C:/Users/ASUS>mysql -u root -p123ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

mysql忘记密码

停止mysql服务

D:/>net stop mysqlMySQL 服务正在停止.MySQL 服务已成功停止。

打开mysql的配置文件my.ini

在[mysqld]下加入该条语句

skip-grant-tables

保存退出

然后重新启动mysql

D:/>net start mysqlMySQL 服务正在启动 .MySQL 服务已经启动成功。

登录mysql，不使用密码可以直接登录

D:/>mysql -h localhost -u root -pEnter password:Welcome to the MySQL monitor.  Commands end with ; or /g.Your MySQL connection id is 1Server version: 5.0.96-community-nt MySQL Community Edition (GPL)Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql>

执行下面命令

mysql> use mysql;Database changedmysql> update user set password = password("123456") where user = "root";Query OK, 2 rows affected (0.06 sec)Rows matched: 2  Changed: 2  Warnings: 0mysql> flush privileges;Query OK, 0 rows affected (0.01 sec)mysql> exitBye

现在设置了登录密码为123456。应该删除skip-grant-tables这条语句，然后重新启动，现在就可以使用新密码登陆了。