C++中拷贝构造函数、临时对象、深拷贝和浅拷贝案例源码，动手做实验，深入理解C++copy-C++ copy constructor, temporary objects, deep copy and shallow copy of case source code, hands-on experiments, in-depth understanding of C++ copy
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001381s ]
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:0.085410s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001108s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001120s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001022s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003116s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000895s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003815s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016326s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001558s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 59406 [ RunTime:0.017263s ]
