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I have a relational database where each entry is marked as a dot with latitude/longitude coordinates. I give the user the ability to mark an arbitrary polygon on a map, and want to return all entries that are within the polygonal shape.
What would be the best way to achieve this?
Also, it might be worth to point out that small errors are ok (ie. if there is an effective way to turn the polygon into a set of rectangles, then that is fine).
Use spatial extensions, most databases have this. In MySql you can only use them with MyISAM tables which are not transactional.
http://dev.mysql.com/doc/refman/5.0/en/spatial-extensions.html