通过51单片机产生不同频率的信号,在喇叭上产生不同频率的声音信号,实现不同音乐播放-Through 51 different single-chip frequency signal generated in the speaker s voice signals at different frequencies, different music player
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002627s ]
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:0.099616s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002182s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002944s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002145s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003742s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001960s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003269s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014397s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002375s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 147393 [ RunTime:0.001242s ]