用置换的方法对文件进行加密，采用C语言实现，简单的一个例子，对于学习是很有帮助的。-replacement with the right documents encrypted using C language, a simple example, the study is very helpful.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002162s ]
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:0.087499s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002542s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002095s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002469s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003698s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002207s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003415s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015850s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002365s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 123967 [ RunTime:0.001176s ]
