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Apr 17, 2013, 05:26 #1
- Join Date
- Jan 2006
- Merry Land, USA
- 3 Post(s)
- 0 Thread(s)
How to handle an unknown number of subcategories
A while ago I read rudy's page on Categories and Subcategories, which was not only a big help with my photo gallery, but also with a few projects at work. But rudy's sample begged a question that I'm just now getting around to asking.
Consider the following:
id | cat_name | parent_id
SELECT parent.name AS parent , sub1.name AS sub1 , sub2.name AS sub2 FROM categories LEFT JOIN categories AS sub1 ON sub1.parent_id = categories.id LEFT JOIN categories AS sub2 AS sub2.parent_id = sub1.id WHERE parent.parent_id IS NULL ORDER BY parent, sub1, sub3
This all works really well IF you know how many levels of subcategory you have. But what if this is an application where a user can create subcategories, and you have no idea how many levels deep they'll go?
Do you programatically limit how deep the user can go? Do you count the number of levels deep they've gone and alter the query to suit? Just curious!<cfset myblog = "http://cydewaze.org/">