如何使用1或2个查询构建主题注释?

问题描述

有人能为线程注释系统建议一个创新的数据库结构+提取算法，该算法每页输出x个线程(每个线程无限制答复)吗?

Can anyone suggest a creative database structure + fetching algorithm for a threaded comments system, that would output x amount of threads per page (with unlimited replies for each)?

我可以运行查询以获取线程，并在循环的每个实例中运行另一个查询以回显答复....但这是一个坏主意.

I can run a query to get the threads, and in each instance of a loop, run another query to echo out the replies.... but that's a bad idea.

推荐答案

如果只需要2个级别，则可以通过一种查询方式进行操作:

If you need only 2 levels, here's a way with one query:

您的表-id, parent_id, comment列

代码

$rows = mysql_query('
  select *
  FROM
    comments
  ORDER BY
    id DESC');

$threads = array();
foreach($rows as $row) {
  if($row['parent_id'] === '0') {
    $threads[$row['id']] = array(
      'comment' => $row['comment'],
      'replies' => array()
    );
  } else {
    $threads[$row['parent_id']]['replies'][] = $row['comment'];
  }
}

在$threads中，您将拥有所有主线程，而$threads[$id]['replies']将保留所有答复.线程已排序-最新=首先，添加一些页面调度，您就可以开始了.

In $threads you will have all your main threads and $threads[$id]['replies'] holds all replies. The threads are sorted - latest = first, add some paging and you're good to go.

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