用51单片机内部定时器实现数字钟功能,可以显示小时,分,秒,误差很小。-51 single-chip microcomputer with internal timer digital clock function, can display hours, minutes and seconds, the error small.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001720s ]
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:0.094533s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000984s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001345s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000896s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.002974s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000741s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003323s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014198s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001217s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 197153 [ RunTime:0.015349s ]