[Haskell-cafe] Re: pure Haskell database

[Achim Schneider]

"Rich Neswold" <rich.neswold at gmail.com> wrote:

> On Thu, Sep 25, 2008 at 11:09 AM, Manlio Perillo
> <manlio_perillo at libero.it>wrote:
> 
> > Rich Neswold ha scritto:
> >
> >> On Wed, Sep 24, 2008 at 4:17 PM, Manlio Perillo
> >> <manlio_perillo at libero.it<mailto: manlio_perillo at libero.it>> wrote:
> >>
> >>    I need a simple, concurrent safe, database, written in Haskell.
> >>    A database with the interface of Data.Map would be great, since
> >> what I need to to is atomically increment some integer values, and
> >> I would like to avoid to use SQLite.
> >>
> >> How about  "MVar (Map k Int)"?  or even "Map k (MVar Int)"?
> >>
> >
> > Yes, it is a solution; and I can run a thread that every N seconds
> > writes the database to a file.
> >
> > But this works only if the database is used by only one process.
> >
> 
> Ah. When you said "concurrent safe", I thought you meant within the
> application. You're looking for something like
> this<http://hackage.haskell.org/cgi-bin/hackage-scripts/package/anydbm>
> .
> 
Or even HApps-State (http://happs.org/) for moar 0v3rk1ll, of which you
can never ever have enough.

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