ping命令是用来查看网络上另一个主机系统的网络连接是否正常的一个工具。ping命令的工作原理是：向网络上的另一个主机系统发送ICMP报文，如果指定系统得到了报文，它将把报文一模一样地传回给发送者，这有点象潜水艇声纳系统中使用的发声装置。-ping command is used to view the network to another host system
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002112s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.091937s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002591s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002221s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003672s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002081s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015462s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002453s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 137205 [ RunTime:0.001203s ]
