行列式计算，基本的行列式的运算都实现了而且可以任意阶运算，不过阶数太高会影响速度-determinant calculation, the basic determinant of the computing is achieved can be arbitrary order operation, but the order will affect the speed is too high
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001275s ]
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:0.089230s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001154s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001929s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001154s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003636s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000990s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003331s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014509s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001250s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 311206 [ RunTime:0.001404s ]
