一个数据结构，其中每个元素包含指向下一个和以前的内容在列表中，形成了双向线性名单。-A data structure in which each element contains pointers to the next and previous elements in the list, thus forming a bidirectional linear list.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001747s ]
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:0.100851s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001258s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002010s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001247s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003724s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001077s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003552s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015227s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001621s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 129317 [ RunTime:0.001277s ]
