该代码实现的是路由器收发的功能。这种功能为了实现Bacnet楼宇设备间设备而设计的。BACnet是一个为嵌入式系统实现的BACnet （楼宇自动化和控制网络）专门协议。 BACnet本身就是一个标准的路由协议设计用于处理通信自动化的建筑，如空调系统和其他暖通设备。楼宇自动控制网络数据通讯协议（即： A Data Communication Protocol for Building Automation and Control Networks，简称《BACnet协议》）由美国暖通、空调和制冷工程师协会(ASHRAE ) 组织的 标准项目委员会135P (Stand Project Committee即SPC 135P)历经八年半时间开发的。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000961s ]
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:0.090392s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001101s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001261s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000928s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003061s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000835s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003573s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015154s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001077s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 329982 [ RunTime:0.015524s ]
