提供几种常见的文件操作，如对文件进行读或写，显示目录，创建目录等等。-provide several common file operations, such as the document read or write, show directory, create directories and so on.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001220s ]
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:0.098853s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001091s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001396s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001487s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005589s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001324s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.007410s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.017546s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001189s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 301370 [ RunTime:0.015414s ]
