注意：mysql默认的root账户只能在本地连接
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 identified by "root";原先数据表结构
mysql> use mysql;Database changedmysql> 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 changedmysql> 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 changedmysql> 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.