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C++ OR mapping - cross platform and db

Any good suggestions for something like that? i.e, Hibernate but for C++.

I am looking for a product/solution that can be used in production work, so it must be stable, supported etc.

By Ehud Lamm at 2005-01-29 12:43 | LtU Forum | previous forum topic | next forum topic | other blogs | 10936 reads

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Funny You Ask...

...as this is also critical for me. Unfortunately, the only open source system I've found that even comes close is the Database Template Library, and on UNIX it mostly serves to show how buggy most vendors' ODBC drivers are. It does work nicely with MySQL, though.

By Paul Snively at Sat, 2005-01-29 15:36 | login or register to post comments

OR mapping for C++

Hello Paul,

As you said the DTL is not exactly an O/R mapping tool.

Does anybody know about any commercial tool for cross platform/db O/R mapping tool for C++?

Thanks,
Yair

By Yair Sade at Sun, 2005-01-30 12:52 | login or register to post comments

Hi there...

Fancy seeing you here :-)

By Ehud Lamm at Sun, 2005-01-30 14:19 | login or register to post comments

Write your own

This may sound daunting, but actually it is quite quick (a few days) and easy, (and supportable/extendable).

First decide what "one case" looks like, making decisions about Dynamic SQL vs Stored Procedures, etc. Decide on your Security and Transaction models. Decide on your object structure. Then write this for one case.

Now just extract the "fixed" vs "variable" portions. For the "variable" portions, write functions to produce them from an annotated schema, and perhaps some additional parameters.

You can write the functions in many languages. I use Lisp, but I have also written them in Scheme, Erlang and JavaScript. Anything with "eval" makes the code very simple.

Now just read the template file, write out literally until you find the "markers" (I use #~...~#). Between markers, "eval" and write out that. You now have your compilable source.

By Alex Peake at Sat, 2005-01-29 16:20 | login or register to post comments

So there isn't any?

No tool matches the requirements?

By Ehud Lamm at Tue, 2005-02-01 16:28 | login or register to post comments

I dunno...

...what are the requirements?

By Paul Snively at Tue, 2005-02-01 17:53 | login or register to post comments

Requirements

any commercial tool for cross platform/db O/R mapping tool for C++

used in production work, so it must be stable, supported etc.

By Ehud Lamm at Tue, 2005-02-01 18:32 | login or register to post comments

find any?

Ehud-

Any luck find this type of solution? I'm looking for the same thing.

Thanks

Don
dohunt@hotmail.com

By dohunt at Fri, 2005-04-29 22:34 | login or register to post comments

Nope :-(

Nope :-(

By Ehud Lamm at Sat, 2005-04-30 08:22 | login or register to post comments

It doesn't meet the requirements but ...

... I've developed a library that provides relational views of collections of runtime objects (which can be C++ objects provided that a bit of reflective glue is implemented -- similar to providing a COM interface to an existing class). It actually implements a full relational database (with extension-points to defer to other RDBMs as necessary).

It's kind of tangential to what you're looking for, I guess. I made it to allow "update visible-objects set highlight = <blue> where type = <truck> and loyalty = <enemy>" in computer game code. Still I wonder if it would be worth it to make a sourceforge project out of it (and maybe work an OR mapping into it -- just a minor addition).

I've got a small demo on my website, if anybody might be interested in helping me turn it into a community project.

By Kalani at Wed, 2005-05-04 18:15 | login or register to post comments