1、進入mysql，建立一個新使用者root,密碼為root：

格式：grant 許可權 on 資料庫名.表名 to 使用者@登入主機 identified by “使用者密碼”;
grant select,update,insert,delete on . to [email protected] identified by “root”;

原先資料表結構

mysql> use mysql;
Database changed
mysql> select host,user,password from user;
+-----------+------+-------------------------------------------+
 

| host      | user | password                                  |
+-----------+------+-------------------------------------------+
| localhost | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+-----------+------+-------------------------------------------+

執行上述語句後結果

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表中已有剛才建立的root使用者。host欄位表示登入的主機，其值可以用IP，也可用主機名，
有時想用本地IP登入，那麼可以將以上的Host值改為自己的Ip即可。

2、實現遠端連線(授權法)

將host欄位的值改為%就表示在任何客戶端機器上能以root使用者登入到mysql伺服器，建議在開發時設為%。
update user set host = ’%’ where user = ’root’;

將許可權改為ALL PRIVILEGES

mysql> use mysql;
Database changed
mysql> grant all privileges  on *.* to [email protected]'%' 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)

這樣機器就可以以使用者名稱root密碼root遠端訪問該機器上的MySql.

3、實現遠端連線（改表法）

use mysql;

update user set host = ‘%’ where user = ‘root’;

這樣在遠端就可以通過root使用者訪問Mysql.