实现多项式表达式的运算器利用栈实现表达式计算器的模板类；用表达式计算器类和多项式类实现多项式表达式的计算器-polynomial expressions for the use of the computing stack to achieve expression calculator template; Using expressions like calculators and polynomial type polynomial expressions Calculator
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001022s ]
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:0.082155s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001107s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001835s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001566s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003136s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000866s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003587s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015277s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001116s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 126252 [ RunTime:0.018367s ]
