mysql常用命令之-用户密码修改

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mysql常用命令之-用户密码修改

来源: 作者: 时间:2016-02-18 10:28 【

mysql常用命令之-用户密码修改--创建用户CREATE USER #39;user1#39;@#39;localhost#39; IDENTIFIED BY #39;pass1#39;;GRANT SELECT,INSERT,UPDATE,DELETE ON *.* TO #39;user1#39;@#39;local...
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 mysql
mysqladmin: connect to server at 'localhost' failed
error: '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/mysql
socket=/var/lib/mysql/mysql.sock
skip-name-resolve
skip-grant-tables


Step 2: 重新启动mysql
[[email protected] ~]# service mysql restart
Shutting 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了
[[email protected] ~]# 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.24 MySQL Community Server (GPL)

Copyright (c) 2000, 2011,  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> use mysql;
Database changed
mysql> update user set password=password('new_password') where user='root';
Query OK, 5 rows affected (0.00 sec)
Rows matched: 5  Changed: 5  Warnings: 0

mysql> 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
[[email protected] ~]# mysql
ERROR 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-tables

Step 5: 重新启动mysql
[[email protected] ~]# service mysql restart
Shutting 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
[[email protected] ~]# mysqladmin -u user1 -ppass1 password pass2

--直接修改数据库表
[[email protected] ~]# mysql -u user1 -ppass1 –Dmysql
mysql> update user set password=password('pass2') where user='user1';
mysql> flush privileges;

 

 
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