利用GPS作为时钟源实现精确计时，方便实用，定时精度达到300ns以内。
-The use of GPS as a clock source to achieve accurate timing, convenient and practical, timing accuracy of less than 300ns.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001909s ]
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:0.084580s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002442s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001942s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002215s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003846s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002075s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003404s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015047s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002723s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 139228 [ RunTime:0.001048s ]
