合式公式的判断，根据输入的公式判断是否是合式公式，数理逻辑-Well-formed formulas of the judge, according to the formula to determine whether the input is a well-formed formulas, mathematical logic
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.005492s ]
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:0.109929s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000987s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001175s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000963s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003206s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000955s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003887s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.017473s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001170s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 237230 [ RunTime:0.244667s ]
