[Haskell-cafe] Re: databases in Haskell & type-safety

[guenni68]

Hi Austin,

could you post the patch please?

So far there is no updated version of takusen that builds with ghc
6.10

Günther

On 3 Jan., 11:25, Austin Seipp <mad.... at gmail.com> wrote:
> Excerpts from Gour's message of Sat Jan 03 03:48:44 -0600 2009:
>
>
>
>
>
> > Hi!
>
> > I'd like to use sqlite3 as application storage in my haskell project...
>
> > Browsing the available database options in Haskell it seems that:
>
> > a) HSQL is dead (hackage reports build-failure with 6.8 & 6.10)
>
> > b) haskelldb is also not in a good shape - build fails with 6.8 & 6.10
>
> > For Haskell-newbie as myself, it looks that haskelldb is the one which
> > provide(ed)s the most secure API (I was reading draft paper about
> > MetaHDBC but, apparently, the type inference support in open-source
> > databases is poor and that's why, according to the author "This is
> > unfortunately as it makes MetaHDBC a lot less valuable."
>
> > What remains is:
>
> > c)Takusenwhich is also not up-to-date (it fails with 6.10) and
>
> > d) HDBC and sqlite bindings which are the only packages which build with
> > 6.10.
>
> Have you tried the simple sqlite3 bindings available?http://hackage.haskell.org/cgi-bin/hackage-scripts/package/sqlite
>
> > I'm not familiar withTakusenwhich says: "Takusen'sunique selling
> > point is safety and efficiency..." and I would appreciate if someone
> > could shed some more light to its 'safety' and the present status?
>
> Takusenis based on the (unique) concept of a left-fold
> enumerator. Having a left-fold interface guarantees timely (nearly
> perfect, really) deallocation of resources while still having the
> benefits of a 'lazy' stream. This interface has (as shown by Oleg and
> others) proven to be very efficient in a number of cases as well as
> favorable for many. The idea is very novel, and truly worth exploring
> if you ask me.
>
> For more information about left-fold enumerators andtakusen, see here:
>
> http://okmij.org/ftp/papers/LL3-collections-enumerators.txthttp://okmij.org/ftp/Haskell/fold-stream.lhshttp://okmij.org/ftp/Haskell/misc.html#takusen
>
> NB: I have *just* (about 5 minutes ago) sent in a patch fortakusen
> to get it to build on GHC 6.10.1 to Oleg. Hopefully an updated version
> will appear on hackage in the next few days.
>
> Austin
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