虚函数的使用。又一个有关VC++虚函数的源程序，比较适合VC++初学者。以后我上传一系列这种类型的源程序供大家学习之用。-virtual function use. The VC also a virtual function of the source, more suitable for beginners VC. After I uploaded a series of this type of source for all learning.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001268s ]
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:0.090579s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001222s ]
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