多功能计算器，不但实现基本运算器，还能实现相关公式的计算-Multi-function calculator, not only for basic computing device, but also achievement of the relevant formula for the calculation of
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001083s ]
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:0.071273s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001841s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002212s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001888s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.006785s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001632s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.006766s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.023697s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001698s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 266105 [ RunTime:0.023041s ]
