功能：返回自格林威治时间1970年1月1日午夜（00：00：00）开始所经历的秒数，没有错误返回值-function : to return to Greenwich time since January 1, 1970 at midnight (00:00:00) experienced in seconds, no error return values
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.003029s ]
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:0.088328s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002234s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001908s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002213s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003626s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002156s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003277s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014590s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002317s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 129174 [ RunTime:0.001218s ]
