查看mysql主机名称的示例：
通过sql语句“ select host,user,password from mysql.user;”可以查看主机、用户和密码信息。例：
mysql> select host,user,password from mysql.user;
+-----------+---------+-------------------------------------------+
| host | user | password |
+-----------+---------+-------------------------------------------+
| localhost | root | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
| localhost | afdwe | *E6CC90B878B948C35E92B003C792C46C58C4AF40 |
| localhost | dfsd | *E6CC90B878B948C35E92B003C792C46C58C4AF40 |
| % | sdfsdf | *00A51F3F48415C7D4E8908980D443C29C69B60C9 |
| % | aaadfe | *13F9536FF36FEA8F67E07DC30BC06D86AE67CB75 |
| % | adfe | *00A51F3F48415C7D4E8908980D443C29C69B60C9 |
+-----------+---------+-------------------------------------------+
6 rows in set (0.06 sec)