这是用链表实现的栈数据结构。链表数据结构的最大优点是不受元素个数的限制，除非内存耗尽。-This is the stack implementation with linked list data structure. List data structure is not subject to the greatest advantage of the restricted number of elements, unless the memory run out.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001060s ]
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:0.086988s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001089s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001311s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001274s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003230s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001644s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003721s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.018524s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001125s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 152073 [ RunTime:0.012650s ]
