mysql常用命令之-用户密码修改_MySQL

mysql常用命令之-用户密码修改

--创建用户CREATE USER 'user1'@'localhost' IDENTIFIED BY 'pass1';GRANT SELECT,INSERT,UPDATE,DELETE ON *.* TO 'user1'@'localhost';GRANT ALL ON *.* TO 'user1'@'localhost';

1.修改root密码

方法1：使用mysqladmin命令

--适用于记得root旧密码，修改root密码语法：mysqladmin -u用户名 -p旧密码 password 新密码例如：# mysqladmin -u root -proot password mysql--注意：如当旧密码输入错误时会报如下错误# mysqladmin -u root -proot1 password mysqlmysqladmin: connect to server at 'localhost' failederror: 'Access denied for user 'root'@'localhost' (using password: YES)'

方法2：直接更新user表password字段

--适用于忘记root密码，而对root密码进行重置Step 1: 修改MySQL的登录设置# vi /etc/my.cnf--windows系统是my.ini文件--在[mysqld]的段中加上一句：skip-grant-tables，如没有[mysqld]字段，可手动添加上[mysqld]datadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sockskip-name-resolveskip-grant-tablesStep 2: 重新启动mysql[root@gc ~]# service mysql restartShutting down MySQL..[确定]Starting MySQL...[确定]Step 3: 登录并修改MySQL的root密码--此时直接用mysql即可无需密码即可进入数据库了[root@gc ~]# mysqlWelcome to the MySQL monitor.  Commands end with ; or /g.Your MySQL connection id is 2Server version: 5.5.24 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 itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql> use mysql;Database changedmysql> update user set password=password('new_password') where user='root';Query OK, 5 rows affected (0.00 sec)Rows matched: 5  Changed: 5  Warnings: 0mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)--注意：如果没做step1，直接用mysql登录时会报如下错误[root@gc ~]# mysqlERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)Step 4: 将MySQL的登录设置修改回来再删除/etc/my.cnf文件中的skip-grant-tablesStep 5: 重新启动mysql[root@gc ~]# service mysql restartShutting down MySQL..[确定]Starting MySQL...[确定]

2.修改mysql其它用户密码

同样，普通用户也可以用上面的方法

--使用mysqladmin命令[root@njdyw ~]# mysqladmin -u user1 -ppass1 password pass2--直接修改数据库表[root@njdyw ~]# mysql -u user1 -ppass1 –Dmysqlmysql> update user set password=password('pass2') where user='user1';mysql> flush privileges;