一个简单的解析器，可以对四则运算和if语句进行解析，利用简单扫描的方式词法解析，和压栈方式解释运算，可以帮助学习编译原理-a simple parser can be four operators and if statements for the analysis, simple scanning the lexical analysis, and interpretation Yazhan Operators can help compiler theory
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001799s ]
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:0.071841s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.246898s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.004869s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001447s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.013650s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.030993s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003956s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016681s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001377s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 220699 [ RunTime:0.038560s ]
