C# - Best Method To Search Hierarchical Data?
Mar 15, 2010
I'm looking at building a facility which allows querying for data with hierarchical filtering. I have a few ideas how I'm going to go about it but was wondering if there are any recommendations or suggestions that might be more efficient.
As an example imagine that a user is searching for a job. The job areas would be as follows.
1: Scotland
2: --- West Central
3: ------ Glasgow
4: ------ Etc
5: --- North East
6: ------ Ayrshire
7: ------ Etc
A user can search specific (i.e. Glasgow) or in a larger area (i.e. Scotland).
The two approaches I am considering are:
keep a note of children in the database for each record (i.e. cat 1 would have 2, 3, 4 in its children field) and query against that record with a SELECT * FROM Jobs WHERE Category IN Areas.childrenField.
Use a recursive function to find all results who have a relation to the selected area.
The problems I see from both are:
Holding this data in the db will mean having to keep track of all changes to structure.
Recursion is slow and inefficent.
I'm using C# ASP.NET with MSSQL 2005 DB.
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