表达式求值，包括括号的匹配问题、负数如何识别？2.2.3这样非法的数怎样识别？如何区别3+-2（非法）和3+（-2）（合法）以及3++2（非法）和3+（+2）（合法）-evaluates expressions, including parentheses matching, how to identify negative? 2.2.3 the number of such illegal identify what? What is the difference between 3-2 (illegal) and 3 (2) (legal) and 3 (illegal) and 3 (2) (lawful)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001351s ]
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:0.094441s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001048s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002615s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000905s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003201s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000992s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004626s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014721s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001549s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 155948 [ RunTime:0.016261s ]
