这是一个对数学表达式求值的C++ class，详细的说明在Calculator.pdf中。-this is a mathematical expression evaluates the C class, detailed description of the Calculator.pdf China.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.006575s ]
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:0.104935s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002551s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001103s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001058s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003164s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000900s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003504s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015537s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001183s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 62653 [ RunTime:0.029912s ]
