系统调用拷贝函数
本程序通过Linux的系统调用进行文件拷贝，如果进行一定的修改可以支持断点续传-System call function copy of the procedures adopted by Linux system calls to file copy, if changes must support HTTP
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001165s ]
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:0.072179s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000951s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001328s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000946s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004359s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000992s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003999s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015806s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001095s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 139911 [ RunTime:4.825816s ]
