Re: [gnome-db] gda_data_model_import_from_model ()

2009/7/20 Massimo Cora' <[email protected]>

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> Hi Vivien,
>
> Vivien Malerba wrote:
> >
> >
> > There is no reason the default GdaDataModel iter's implementation should
> > not work. Can you send me a standalone version of your code so I can try
> > to figure out what the problem is?
> >
> > Anyway, even though the GdaDataModelIter is not an interface, you can
> > still subclass it if you need, and then implement the
> > GdaDataModel::i_create_iter method to instanciate your own
> GdaDataModelIter.
> >
>
> sure here it is. Just compile and execute with
> gcc gda-data-model-concat.c example.c `pkg-config --cflags --libs
> libgda-4.0` `pkg-config --cflags --libs glib-2.0` -o example && ./example
>
> As you see from the example, I first try to use the GdaDataModelIter,
> unsuccesfully, secondly I just try to query the items directly from the
> GdaDataModelConcat, successfully.
>
> Honestly I didn't get why gda-data-model has a virtual method
> gda_data_model_iter_at_row, which seems to be implemented in
> GdaDataSelect but with too much logic.
>

Here is a slightly modified version of your code, to make it work. Here is
what I've modified:
* you don't need to bother about iterators, I've removed all that code
* you _need_ to implement the  i_get_access_flags() virtual method (this is
why it failed)
* check that the data models being concatenated support random access mode

If you want to be able to concatenate non random access data models, it's a
bit more difficult, but I can help you.

Vivien

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