Is there an extensible SQL like query language that is safe for exposing via a public API?

Posted by Lokkju on Stack Overflow See other posts from Stack Overflow or by Lokkju
Published on 2010-03-24T20:24:12Z Indexed on 2010/03/30 22:23 UTC
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I want to expose some spatial (and a few non-spatial) datasets via a public API. The backend store will either be PostgreSQL/PostGIS, sqlite/spatialite, or CouchDB/GeoCouch.

My goal is to find a some, preferably standard, way to allow people to make complex spatial queries against the data. I would like it to be a simple GET based request. The idea is to allow safe SQL type queries, without allowing unsafe ones. I would rather modify something that is off the shelf than doing the entire thing myself. I specifically want to support requesting specific fields from a table; joining results; and spatial functions that are already implemented by the underlying datastore.

Ideas anyone?

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