<模拟电子时钟的程序>
算法：将当前时间显示到屏幕，当时间发生变化时，清屏，显示新的时间（当有键盘操作时退出程序）。
(显示时间格式：小时：分钟：秒)
-" Analog electronic clock program" algorithm: the current time displayed on the screen, when the time change, clear screen, display the new time (when there is the keyboard operation, exit procedures). (Show Time format: hours: minutes: seconds)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001271s ]
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:0.089723s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001187s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001942s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001270s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003718s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000991s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003229s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016260s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001329s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 157709 [ RunTime:0.001510s ]
