一个简单的计算机网络程序，描述计算机滑窗协议。实现回退N帧。-a simple computer network program, describes the computer sliding window of the agreement. Reverting to achieve N frame.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001246s ]
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:0.092176s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001266s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001947s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001244s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003698s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001055s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003232s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014729s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001378s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 127889 [ RunTime:0.001389s ]
