C++ primer plus第7章课后的编程练习，所有代码都通过编译，学习C++的同学可以参考一下。-C++ Primer plus Chapter 7 after-school programming exercises, all code through the compiler, learning C++ Students for reference.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001552s ]
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:0.101499s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001363s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002030s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001415s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003643s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001176s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003246s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.024758s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002142s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 63776 [ RunTime:0.001776s ]
