该例子是用objective-c语言，在xcode平台上开发的计算器程序，对刚开始学习objective-c语言的新手来说，还是有一些帮助的。-The example is objective-c language, xcode platform developed calculator program, to just start learning objective-c language, newcomers, there are still some help.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.069471s ]
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:0.208679s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001244s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001254s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001067s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004871s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001569s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004661s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.023252s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001439s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 256228 [ RunTime:0.017380s ]
