利用红外线传感器完成小车的循迹功能，效果很好，小车速度快，且运行平稳-The use of infrared sensors for tracking the completion of car features, very good, fast car, and the smooth operation
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001240s ]
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:0.132734s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001441s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002167s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001199s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003831s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000992s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003441s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.017330s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001397s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 174871 [ RunTime:0.001415s ]
