使用递归的方法实现的算式分析器，给定一个符合C语言格式的算式，可以使用括号，单目运算符等，计算算式的运算结果。-use recursive method formula Analyzer, to set a C-language format with the formula, you can use brackets, Monocular Operators, calculation formula of the calculation results.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001410s ]
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:0.064638s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001108s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001360s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001346s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003341s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000891s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003787s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.028518s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002005s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 303827 [ RunTime:0.036574s ]
