Re: [gnome-db] libgda performance issues

On 6/21/07, Piotr Pokora <piotrek pokora gmail com> wrote:
"Vivien Malerba" <vmalerba gmail com> wrote:

> As for the API extension, it could be possible to add some parameters
> to the execute() function implemented within each provider to specify
> what GType is expected for each column of the SELECT query being
> executed (note that the current operating mode would still be
> useable).

I think I do not follow.
Do you mean I can invoke gda_connection_execute_select_command with
GdaParameterList ?

Yes, you can pass a GdaParameterList object to the
gda_connection_execute_select_command() function, see the
documentation about it for what named parameters it can contain.

If yes, does it mean I can use gda_parameter_list_add_param_from_value?
If yes, does, 'name' argument is column name?

No, the parameters is the GdaParameterList object help specify some
aspects of the returned data model (such as if you want a random
access data model, or a cursor based one).

And if I can use GdaParameterList, what's the correct way to use it?

See the docs.

GdaParameterList* gda_parameter_list_new    (GSList *params);
requires params, while gda_parameter_list_add_param_from_value will
return GdaParameter but still requires GdaParameterList.

You can use gda_parameter_list_new (NULL) and then call
gda_parameter_list_add_param () each time you want to add a parameter,
or you can use gda_parameter_list_new_inline().

In both cases, you can pas NULL for the dict argument.


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