两数比较大小，交换以保持a>b
如果a已经大于b则不交换
交换前后状态都显示-Comparison of the size of two the number of exchange in order to maintain a> b greater than b if a has been exchanged before and after the exchange of state does not show
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002250s ]
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:0.090687s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002541s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002097s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002533s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003873s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002068s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004630s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016184s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002750s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 160950 [ RunTime:0.001619s ]
