采用搜索策略求解数独问题，对于简单的数独，基本不花时间，对于很复杂的情况也近似秒杀-Search strategy used to solve Sudoku problems, for the simple Sudoku, basic does not spend time, for a very complicated situation is similar to spike
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001307s ]
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:0.090684s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001518s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002944s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001352s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003830s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001205s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003603s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016641s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001503s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 204951 [ RunTime:0.001311s ]
