高精度数的加减乘法，可以自定义进制，作为类实现，直接使用即可。-precision the number of addition and subtraction multiplication can be defined band, as the category achieved, can be used directly.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001331s ]
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:0.080187s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001034s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001129s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000935s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003330s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000718s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003718s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014548s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001103s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 315746 [ RunTime:0.013728s ]
