FTP（File Transfer Protocol）协议主要用来在网络上进行文件传输。FTP通讯除了有一个默认的端口21外，还有其他端口，同城两个端口同时进行数据传输。一个是默认的端口（通常为21），主要进行控制连接，即进行命令协议及服务器端响应码的传输。另一个非标准端口主要进行数据，上传下载文件等。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001040s ]
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:0.079590s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000958s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001083s ]
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:0.003104s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000802s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003578s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015087s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001032s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 334542 [ RunTime:0.011273s ]
