包含一个源文件，实现一个简单的计算器功能，如自己再扩充功能，可实现自定义变量，自定义方程等。-contains a source, the realization of a simple calculator functions, such as further expansion of their functions can be realized from the definition of variables, since the definition of equations.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002580s ]
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:0.088387s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002303s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002002s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002162s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003629s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001917s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003208s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015002s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002412s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 202867 [ RunTime:0.001223s ]
