java解决数独问题，这个程序很短，设计得比较精妙，其中有详细解释。-java to solve Sudoku problems, this procedure is very short, designed to be relatively sophisticated, including a detailed explanation.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001237s ]
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:0.088378s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001170s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001971s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001162s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004007s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001447s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003388s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016751s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001368s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 48852 [ RunTime:0.001463s ]
