通过编译原理的知识做的一个小程序，实现的功能是完成字符串表达式的计算-Principles of knowledge through the compiler to do a small procedure, the function is to realize the completion of the calculation of the string expression
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001348s ]
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:0.096398s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001371s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001941s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001588s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003660s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001161s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003244s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015219s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001498s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 108406 [ RunTime:0.001446s ]
