[Mono-list] Any interest in a new open source project?

Jaroslaw Kowalski jaak@zd.com.pl
Fri, 30 Jul 2004 14:28:10 +0200

I'm writing an O/R mapper as part of my MS Thesis.

It's called Sooda (simple object oriented data access), features most of the
things you could expect from an O/R mapper (inheritance and query language

Sooda is designed to be SIMPLE (both when creating the mapping and when
using the objects in your applications) and PORTABLE (works with Mono/.NET,
PostgreSQL, MySQL4, MSSQL, Oracle9). It's BSD-licensed with one GPL-ed GUI



(the rest of the site is unfinished).

The package hasn't been officially released yet (expected in about 2 months
after I graduate and have some more spare time), but if anyone wants to try
it - contact me and I'll give you the read-only Subversion access to the
source code.


----- Original Message ----- 
From: "Ole Hyldahl Hansen" <ohh@scisoft.dk>
To: <mono-list@lists.ximian.com>
Sent: Friday, July 30, 2004 1:29 PM
Subject: Re: [Mono-list] Any interest in a new open source project?

> Gert Kello wrote:
> >>
> >> Andrew, I am sure there will be great interest in such a project,
> >> juding from the large number of Object-Relationel Mappers. As far as
> >> I know most are proprietary. I have put some effort into finding a
> >> suitable solution but no acceptable free solutions exists (I could
> >> not find any. Please prove me wrong).
> >>
> >> I have worked a little on something that sounds quite similar to what
> >> you are describing. I would very much like to see what you have
> >> produced so far, and if we are indeed persuing the same goal I will
> >> be willing to help with the creation of a free solution.
> >
> >
> > I'm also about start a non-profit project where I want to use an OPF.
> > I did make a list from libraries present in http://SourceForge.net/ So
> > far I have managed to review only Gentle.Net (Which didn't satisfy me)
> >
> > So, could You please share You findings about OPF-s? You might make my
> > life much easier :)
> Well, I must say that I never did any thorough evaluations.  I tend to
> get frustrated with a many of the frameworks rather quickly, because
> they often only allow you to download timelimited and/or crippled
> demoversions.
> First let me point you to a discussion some months ago on usenet (hope
> the link works :-):
> Someone defines his or her ideal framework and asks for something that
> matches as closely as possible. Several frameworks are discussed here.
> There is one framework that might be very good: http://www.llblgen.com
> I am a big fan of code generation and llblgen seems to generate nice
> code. But as I understand it, they do not use a transaction-cache based
> on object identity, which is something I consider essential. IMHO the
> following should hold:
> DataObject o1 = Lookup (<some primary key>);
> DataObject o2 = Lookup (<same primary key>);
> Assert (o1 == o2);
> This is not the case with llblgen: Something like this is true though:
> DataObject o1 = Lookup (<some primary key>);
> DataObject o2 = Lookup (<same primary key>);
> Assert (o1.Equals (o2));
> but if you change an attribute in object o1 is that change visible in
> object o2? I think not and I would very much like that to be the case.
> When I played around with this kind of stuff myself a basically created
> a hashtable per transaction and cached all loaded objects in this
> hashtable by their primary key. This way there can only exist a single
> instance for each primary key (per transaction. Different transactions
> sees different objects.)
> Another possibility might be the .NET port of Hibernate  (NHibernate). I
> do not know how mature it is, but I have heard Hibernate can be quite nice
> > Also, I'm willing to share my findings about the ones You didn't
> > evaluate...
> >
> >
> > And to any other in list: Could You plase share You knowledge about
> > diffrent free OPF-s.
> >
> > If I do not find one that satisfies me, I'm thinking to roll my own
> > one... Or, if there is one to be satisfying, I would gladly join the
> > team.
> >
> > P.S. Note to the list adnministrator: Is there any reasons why the
> > reply-to address is not set to the list? I usually want to reply to
> > the list... And it is tedious to do recipient clean-up every time I
> > make "Reply All"
> >
> If you any good ones I would like to hear it, but I sort of gave up and
> decided to see if I could come up with something by myself. However,
> creating a good framework takes a lot of time, so a joined effort would
> probably be better.
> /Ole
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