为什么第一页再点击第一页会报错Warning: mysql_fetch_row() expects parameter 1 to be resource, boolean given in E:\www\wamp\www\studentSystem\AdminB\article-list.php on line 72，Warning: mysql_free_result() expects parameter 1 to be resource, boolean given in E:\www\wamp\www\studentSystem\AdminB\article-list.php on line 93在点击下一页就不会报错
