本代码可以求得输入的表达式的值，经过编译后，可以输入表达式个数，数值表达式，最后求得值-This code can obtain the value of the input expression, after compiled, you can enter the number of expressions, numerical expressions, the final value is obtained
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001535s ]
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:0.100600s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001360s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001960s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001368s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003657s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001160s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003279s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015185s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001451s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 220818 [ RunTime:0.001549s ]
