[Haskell-cafe] Re: pure Haskell database

"Rich Neswold" wrote:

On Thu, Sep 25, 2008 at 11:09 AM, Manlio Perillo wrote:

...

Rich Neswold ha scritto:

...

On Wed, Sep 24, 2008 at 4:17 PM, Manlio Perillo > 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 thishttp://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. -- (c) this sig last receiving data processing entity. Inspect headers for copyright history. All rights reserved. Copying, hiring, renting, performance and/or broadcasting of this signature prohibited.