[Haskell-cafe] databases in Haskell & type-safety
mad.one at gmail.com
Sat Jan 3 05:25:12 EST 2009
Excerpts from Gour's message of Sat Jan 03 03:48:44 -0600 2009:
> 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) Takusen which 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
Have you tried the simple sqlite3 bindings available?
> I'm not familiar with Takusen which says: "Takusen's unique selling
> point is safety and efficiency..." and I would appreciate if someone
> could shed some more light to its 'safety' and the present status?
Takusen is 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 and takusen, see here:
NB: I have *just* (about 5 minutes ago) sent in a patch for takusen
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.
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