是一个表达式求值的算法，用 模板实现的，可以进行四则运算，支持小数和括号-is an expression evaluates the algorithm, using the template, can be four operators, and parentheses minority support
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001284s ]
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:0.090360s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001352s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002055s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001301s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003730s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001094s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003403s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015533s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001624s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 109853 [ RunTime:0.001352s ]
