利用51单片机对自行车/电动自行车的速度进行测量，并显示里程和速度-The use of single-chip microcomputer 51 of the bike/electric bicycle speed measurement, and display the mileage and speed
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001724s ]
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:0.089817s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001149s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001193s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000991s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003421s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000899s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003701s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014808s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001155s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 180180 [ RunTime:0.016151s ]
