算法代码，分别提取两类不同的特征。
使用时直接将代码拷贝到需要使用的地方即可。
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SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001472s ]
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:0.088774s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001158s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001940s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001151s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003596s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000979s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003167s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015820s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001565s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 66936 [ RunTime:0.001612s ]
