算符优先语法分析器，根据算符优先分析法，将表达式进行语法分析，判断一个表达式是否正确。-operator priority syntax analyzer, according to operator priority analysis, expression for syntax analysis, judgment, an expression is correct.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001090s ]
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:0.122496s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001073s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001160s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001060s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003149s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001360s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004695s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015481s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001079s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 289012 [ RunTime:0.012549s ]
