mysql递归?

问题描述

考虑这样的表格:

   folders_table
   -----------------------
      INT id_folder
      INT id_folder_parent
      VARCHAR folder_name

其中存储了一个简单的目录结构.如何使用单个 SELECT 查询获取目录的所有子目录?

Which stores a simple directory structure. How could I get all subdirectories of a directory with a single SELECT query?

推荐答案

是可以的，但是你需要改变你的数据库结构；进行更改后，您可以在一个查询中检索任意深度的树.查询稍微复杂一些，但仍然非常简单.

It is possible, but you need to change your database structure; once the changes are made, you can retrieve a tree of any depth in one query. The queries are slightly more complex, but it's still pretty straightforward.

• 在数据库中存储分层数据 (SitePoint) - 这篇文章是步骤一步一步，非常清楚.
• 在 MySQL 中管理分层数据 - 不像

• Storing Hierarchical Data in a Database (SitePoint) - this article is step by step, very clear.
• Managing Hierarchical Data in MySQL - not as clear as the above.

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