[MySQL]MySQL之权限管理

mysql>grant all privileges on *.* to jack@‘localhost‘ identified by "mypass" with grant option;
Query OK, 0 rows affected (0.01 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

mysql> show grants;
+---------------------------------------------------------------------+
| Grants for root@localhost|
+---------------------------------------------------------------------+
|GRANTALLPRIVILEGESON*.*TO‘root‘@‘localhost‘WITHGRANTOPTION|
|GRANT PROXY ON‘‘@‘‘TO‘root‘@‘localhost‘WITHGRANTOPTION|
+---------------------------------------------------------------------+
2 rows inset (0.00 sec)

mysql> show grants for‘jack‘@‘%‘;
+-----------------------------------------------------------------------------------------------------+
| Grants for jack@%|
+-----------------------------------------------------------------------------------------------------+
|GRANT USAGE ON*.*TO‘jack‘@‘%‘ IDENTIFIED BY PASSWORD ‘*9BCDC990E611B8D852EFAF1E3919AB6AC8C8A9F0‘|
+-----------------------------------------------------------------------------------------------------+
1 row inset (0.00 sec)

mysql>revoke delete on *.* from ‘jack‘@‘localhost‘;
Query OK, 0 rows affected (0.01 sec)

mysql>select host,user,password from user;
+-----------+------+-------------------------------------------+
| host      |user| password                                  |
+-----------+------+-------------------------------------------+
| localhost | root ||| rhel5.4| root |||127.0.0.1| root ||| ::1| root ||| localhost |||| rhel5.4|||| localhost | jack |*9BCDC990E611B8D852EFAF1E3919AB6AC8C8A9F0 |
+-----------+------+-------------------------------------------+7 rows inset (0.00 sec)

mysql>drop user ‘jack‘@‘localhost‘;
Query OK, 0 rows affected (0.01 sec)

mysql> rename user ‘jack‘@‘%‘ to ‘jim‘@‘%‘;
Query OK, 0 rows affected (0.00 sec)

  1、用set password命令
mysql>SET PASSWORD FOR ‘root‘@‘localhost‘ = PASSWORD(‘123456‘);
Query OK, 0 rows affected (0.00 sec)
  2、用mysqladmin
  [root@rhel5 ~]# mysqladmin -uroot -p123456 password 1234abcd
  备注：
  格式：mysqladmin -u用户名 -p旧密码 password 新密码
  3、用update直接编辑user表
  mysql>use mysql
Reading table information for completion oftableandcolumn names
You can turn off this feature to get a quicker startup with-A

Database changed
mysql>update user set PASSWORD = PASSWORD(‘1234abcd‘) whereuser=‘root‘;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
  4、在丢失root密码的时候：
  [root@rhel5 ~]# mysqld_safe --skip-grant-tables &[1]15953[root@rhel5 ~]# 13091109:35:33 mysqld_safe Logging to‘/mysql/mysql5.5/data/rhel5.4.err‘.
13091109:35:33 mysqld_safe Starting mysqld daemon with databases from/mysql/mysql5.5/data

[root@rhel5 ~]# mysql -u root
Welcome to the MySQL monitor.  Commands endwith ; or \g.
Your MySQL connection id is2
Server version: 5.5.22 Source distribution

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> \s
--------------
mysql  Ver 14.14 Distrib 5.5.22, for Linux (i686) using  EditLine wrapper

Connection id:        2Currentdatabase:    
Currentuser:        root@
SSL:            NotinuseCurrent pager:        stdout
Using outfile:        ‘‘
Using delimiter:    ;
Server version:        5.5.22 Source distribution
Protocol version:    10
Connection:        Localhost via UNIX socket
Server characterset:    utf8
Db     characterset:    utf8
Client characterset:    utf8
Conn.  characterset:    utf8
UNIX socket:        /tmp/mysql.sock
Uptime:            36 sec

Threads: 1  Questions: 5  Slow queries: 0  Opens: 23  Flush tables: 1Open tables: 18  Queries per second avg: 0.138--------------

mysql>use mysql
Reading table information for completion oftableandcolumn names
You can turn off this feature to get a quicker startup with-A

Database changed
mysql>updateuserset password = PASSWORD(‘123456‘) whereuser=‘root‘;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)