实现了几种内存页面置换算法，有最佳置换算法和先进先出置换算法，还有LRU置换算法。-To achieve a number of memory page replacement algorithm, the best replacement algorithm and FIFO replacement algorithm, as well as LRU replacement algorithm.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001413s ]
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:0.091664s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001313s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001993s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001324s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003867s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001176s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003353s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015164s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001682s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 188329 [ RunTime:0.001280s ]
