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:0.002010s ]
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:0.087110s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002493s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002202s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003744s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002187s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015665s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002555s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 266105 [ RunTime:0.001339s ]
