Re: [Haskell-cafe] Haskell, Queries and Monad Comprehension

I would be intrested in seeing this! Could you paste or upload it somewhere? 2010/5/24 C. McCann :

2010/5/23 Günther Schmidt :

...

is there anybody currently using Haskell to construct or implement a query language?

I've a half-baked, type-indexed (in HList style) implementation of relational algebra lying around somewhere, if that counts as a "query language". I was experimenting with using it as a sort of abstract collection interface, which actually worked rather nicely I think, but I didn't have time to flesh it out completely. In particular, only very simple queries and limited kinds of relation composition were supported. Definitely just toy code, though, and dreadfully inefficient; if you're looking for an "actual implementation" meaning "usable interface to an external persistence layer" then disregard this.

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