#建库表代码
create database db_monitor ;
use db_monitor ;
CREATE TABLE accesslog
( thread_id int(11) DEFAULT NULL,  #进程id
 log_time datetime default null,  #登录时间
 localname varchar(50) DEFAULT NULL, #登录名称，带详细ip
 matchname varchar(50) DEFAULT NULL, #登录用户
 key idx_log_time(log_time)
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

mysql> show variables like 'init_connect%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| init_connect |    |
+---------------+-------+
1 row in set (0.00 sec

mysql> set global init_connect='insert into db_monitor.accesslog(thread_id,log_time,localname,matchname) values(connection_id(),now(),user(),current_user());'; 

mysql> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:  7
Current database: *** NONE ***

ERROR 1184 (08S01): Aborted connection 7 to db: 'unconnected' user: 'user2' host: 'localhost' (init_connect command failed)