News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

PHPBuilder.com:
Handling Hierarchical Data in MySQL and PHP
September 06, 2012 @ 10:16:44

On PHPBuilder.com today there's a new tutorial showing you a way to work with hierarchical data in MySQL from your PHP application in two different ways (methods).

The hierarchical data structure is one of the most common data structures in programming. It represents a set of data where each item (except the root) has one parent node and one or more children nodes. Web programmers use hierarchical data for a number of applications, including content management systems, forum threads, mailing lists, and e-commerce product categorization. In this tutorial , I will explain how to manage hierarchical data using MySQL and PHP. Specifically, I will explore the two most popular hierarchical data models: adjacency list model and nested set model.

They start with the adjacency list model, showing how to do a left join on the table on the parent ID to record ID and then filter through them, merging them into a main array as needed. The nested set model is slightly different and involves two new columns, a "lft" and "rgt", that point you to the records around the current one. This method makes the actual SQL query to find the structure a bit simpler, but isn't quite as flexible as the first method.

0 comments voice your opinion now!
hierarchical data mysql tutorial nestedset adjacencylist


blog comments powered by Disqus

Similar Posts

Wez Furlong\'s Blog: PDO MySQL slides from MySQLUC 2006

Developer.com: Creating Complex, Secure Web Forms with PHP and HTML_QuickForm2

DotGeek.org: Free Hosting Goes Bingo!

Venture Skills Blog: Want to create a site like Digg with no programming?

Sebastian Göttschkes' Blog: Using vsfstream (with symfony2)


Community Events





Don't see your event here?
Let us know!


api community release framework library series laravel interview application list configure wordpress bugfix developer introduction code threedevsandamaybe podcast project language

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework