php - MySQL 中使用链接动态排序

Question

我有一个 MySQL 查询，我试图在单击链接时动态排序。

我的链接如下所示

                 <form action="topics.php" method="get" class="form">
                   <label class="label">Order Table By</label>
                    <li><a href="topics.php?sort=ID">ID</a></li>
                    <li><a href="topics.php?sort=Title">Title</a></li>
                    <li><a href="topics.php?sort=TAGS">Tags</a></li>
                    <li><a href="topics.php?sort=VIEWS">Views</a></li>
                 </form>

MySQL 查询如下所示:

<?php

        $order = mysql_real_escape_string($_GET['sort']);          
$topics = mysql_query("SELECT topic_id AS 'ID', topic_head AS 'Title', 
                              topic_tags AS 'TAGS', topic_views AS 'VIEWS',
                       FROM forum_topics 
                       WHERE topic_id > 0 ORDER BY '$order' DESC") or die (mysql_error());

当我单击上面的任何链接时，没有任何反应。没有显示错误，也没有进行排序。 问题可能出在哪里？ 谢谢

Answer 1

试试这个:

<?php
  $sortParams = ('ID','Title','Tags','Views');
  $order = mysql_real_escape_string($_GET['sort']);
  if(!in_arrray($order,$sortParams))
  {
    $order = 'ID';//Assuming by default you sorting by ID
  }  
  $topics = mysql_query("SELECT topic_id AS 'ID', topic_head AS 'Title', 
        topic_tags AS 'TAGS', topic_views AS 'VIEWS',
        FROM forum_topics 
        WHERE topic_id > 0 ORDER BY $order DESC") or die (mysql_error());