把链表S中从第m个元素起共n个元素存储到s中，成功返回1，否则返回0int LEN(STRING S) -S in the list from the first m elements from a total of n elements stored in the s successful one back, otherwise return 0int LEN (STRING S)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002479s ]
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:0.086515s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002531s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002062s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002404s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003723s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002141s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003296s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015265s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002724s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 137494 [ RunTime:0.001196s ]
