简单计算器
能够实现简单的加减乘除运算，并且实现了部分运算的优先级，可以加括号，晴空等。-A simple calculator to perform simple addition and subtraction multiplication and division operations, and achieve the priority of some operations can be added in parentheses, clear sky and so on.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001084s ]
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:0.075913s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000932s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001096s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000978s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003058s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000834s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003554s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015181s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001490s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 240313 [ RunTime:0.042046s ]
