Re: R: [Haskelldb-users] HaskellDB in an industrial environment

[Bjorn B. <bri...@cs...>]

Jeremy Shaw wrote:
> Bjorn Bringert wrote:
>>Santoemma Enrico wrote:
>>>Btw, is it possible that the bug 'Repeated field names don't work' is
>>>due to the fact that one cannot read the same field two times when
>>>using ODBC? This is an old odbc error that I often (still) meet. In
>>>haskell I strictly retrieve the record into memory before starting to
>>>retrieve a field, and this fixes the error.
>>
>>The problem is that the extensible record type that we created for=20
>>HaskellDB does not disallow creating a record which contains two fields=
=20
>>with the same label. HList, presented at Haskell Workshp 2004 has a=20
>>solution to this problem, see http://homepages.cwi.nl/~ralf/HList/paper=
.pdf
>=20
> Speaking of which, do you think that we should try to convert
> haskelldb to something like the scheme presented in the Hlist paper? I
> am not familiar enough with the internals of haskelldb yet to compare
> the existing scheme to the one proposed in hlist...

I know the HaskellDB version well, but I haven't studied HList well=20
enough to to be sure. I guess it would be ideal if we could use HList as=20
a library, but I don't know if this is feasible.

/Bj=F6rn