[Haskell-cafe] Interest in typed relational algebra library?

Rune Harder Bak rune at bak.dk
Mon Jul 9 01:04:31 CEST 2012

Yes, that would be very nice!

Type-checked queries really is a must, but I´ve found HaskellDB too
cumbersome to work with.


On Sat, Jul 7, 2012 at 11:45 AM, Paul Visschers <mail at paulvisschers.net> wrote:
> Hello,
> I've been out of the Haskell game for a bit, but now I'm back. A couple of
> years ago I made a small library that implements relational algebra with
> types so that malformed queries and other operations are caught at compile
> time. It is heavily based off of the internals of HaskellDB (see
> http://hackage.haskell.org/packages/archive/haskelldb/2.1.1/doc/html/Database-HaskellDB-PrimQuery.html),
> but types so that it can actually be used directly instead of having to use
> HaskellDB's query monad. Besides the joy of using relational algebra
> directly in your code, this also means that you can make query-optimizing
> code in a type-safe way, you can subquery results returned by the database
> directly without accessing the database again and you have more options when
> converting from relation algebra to SQL or another query language. The
> library isn't quite ready for release, but I might want to work on it a bit
> and then release it. Is anyone interested in such a library?
> Paul Visschers
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