MDI窗体的打开，可以使一个窗体永远置于最前，一个窗体置于后面作为背景，本人花了好久才试出来的。-the MDI windows open, so that one can always put the most Form ago, a window at the back as the background, I spent a long time before the trial.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001853s ]
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:0.134690s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001048s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001359s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001083s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003386s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000815s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.006509s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015189s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001613s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 225102 [ RunTime:0.013126s ]
