[Haskell-cafe] Haskell, Queries and Monad Comprehension

[Markus Läll]

I would be intrested in seeing this! Could you paste or upload it somewhere?


2010/5/24 C. McCann <cam at uptoisomorphism.net>:
> 2010/5/23 Günther Schmidt <gue.schmidt at web.de>:
>> 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.
>
> - C.
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