USB Viewer（USB移动存储设备使用记录查看器）可用于查看本机的USB移动存储设备。可查看的设备有：U盘、移动硬盘、MP3、SD卡……等；
1.枵根据ＵＳＢ端口与磁盘、盘符进行自动对应；从而了解电脑的ＵＳＢ结构。
2.判断ＵＳＢ设备类型，如鼠标，键盘，蓝芽，移动硬盘等．
3.读取ＵＳＢ设备信息，如厂商ＩＤ等．
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001471s ]
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:0.092297s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001743s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002012s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001307s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003679s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001232s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003404s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015163s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002373s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 196882 [ RunTime:0.001564s ]
