MySQL server error report:Array ( [0] => Array ( [message] => MySQL Query Error ) [1] => Array ( [sql] => SELECT article_id, content,title, author, add_time, file_url, open_type FROM `ezvrk4ow5n_lgv1`.`ecs_article` WHERE is_open = 1 AND cat_id IN ('17','22','28','29') ORDER BY article_type DESC, article_id DESC LIMIT ) [2] => Array ( [error] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 ) [3] => Array ( [errno] => 1064 ) )