原文地址:http://www.cnblogs.com/smallstone/archive/2010/04/29/1723838.html
1、进入mysql,创建一个新用户root,密码为root:
格式:grant 权限 on 数据库名.表名 to 用户@登录主机 identified by "用户密码";
grant select,update,insert,delete on *.* to root@192.168.1.12 identified by "root";
原先数据表结构
mysql> use mysql;
Database changed
mysql> select host,user,password from user;
+-----------+------+-------------------------------------------+
| host | user | password |
+-----------+------+-------------------------------------------+
| localhost | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+-----------+------+-------------------------------------------+
执行上述语句后结果
mysql> use mysql;
Database changed
mysql> select host,user,password from user;
+--------------+------+-------------------------------------------+
| host | user | password |
+--------------+------+-------------------------------------------+
| localhost | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| 192.168.1.12 | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+--------------+------+-------------------------------------------+
2 rows in set (0.00 sec)
可以看到在user表中已有刚才创建的root用户。host字段表示登录的主机,其值可以用IP,也可用主机名,
(1)有时想用本地IP登录,那么可以将以上的Host值改为自己的Ip即可。
2、实现远程连接(授权法)
将host字段的值改为%就表示在任何客户端机器上能以root用户登录到mysql服务器,建议在开发时设为%。
update user set host = ’%’ where user = ’root’;
将权限改为ALL PRIVILEGES
mysql> use mysql;
Database changed
mysql> grant all privileges on *.* to root@'%' identified by "root";
Query OK, 0 rows affected (0.00 sec)mysql> select host,user,password from user;
+--------------+------+-------------------------------------------+
| host | user | password |
+--------------+------+-------------------------------------------+
| localhost | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| 192.168.1.12 | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| % | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+--------------+------+-------------------------------------------+
3 rows in set (0.00 sec)
这样机器就可以以用户名root密码root远程访问该机器上的MySql.
3、实现远程连接(改表法)
use mysql;
update user set host = '%' where user = 'root';
这样在远端就可以通过root用户访问Mysql.
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参考文章:http://www.jb51.net/article/31902.htm
具体步骤:登陆到MySQL
首先 use MySQL;
按照别人提供的方式update的时候,出现错误。
MySQL> update user set host='%' where user = 'root';
ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY'
然后查看了下数据库的host信息如下:
MySQL> select host from user where user = 'root';
+-----------------------+
| host |
+-----------------------+
| % |
| 127.0.0.1 |
| localhost.localdomain |
+-----------------------+
3 rows in set (0.00 sec)
host已经有了%这个值,所以直接运行命令:
MySQL>flush privileges;
flush privileges;的意思---->:mysql 新设置用户或更改密码后需用flush privileges刷新MySQL的系统权限相关表,否则会出现拒绝访问,还有一种方法,就是重新启动mysql服务器,来使新设置生效。