通过AD0809将输入的模拟量转化为数字量，
通过调节电位器来改变模拟电压输入，通过数码管显示电压的变化-Through the AD0809 analog input into digital,
By adjusting the potentiometer to change the analog voltage input, digital display voltage changes
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001611s ]
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:0.089345s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001247s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002283s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001196s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004104s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001004s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003394s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015262s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001397s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 216673 [ RunTime:0.001703s ]
