利用单片机定时计数器，测量信号频率： 利用单片机定时计数器，测量信号频率-The use of single-chip timer counters, measuring signal frequency: use of single-chip timer counters, measuring signal frequency
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001299s ]
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:0.111695s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001004s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001471s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.004399s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003183s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000974s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003862s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016878s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001625s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 232688 [ RunTime:0.013563s ]
