Re: [gnome-db] Gda_Value_Stringify of a double

["Daniel Espinosa" <esodan gmail com>]

2006/10/24, Vivien Malerba <vmalerba gmail com>:
> On 10/24/06, Murray Cumming <murrayc murrayc com> wrote:
> > On Tue, 2006-10-24 at 15:14 +0200, Vivien Malerba wrote:
> > > > It says that string is meant to be human-readable, but it ignores
> > > the
> > > > current locale, and it makes assumptions about the numeric
> > > formatting
> > > > wanted. So it's no use for actually showing to a human. I suggest
> > > that
> > > > it be marked as "useful only for debugging, and not for showing
> > > values
> > > > in your user interface."
> > > >
> > >
> > > It is also very usefull when you want to save a value in an (XML for
> > > example) file and you need to be able to read it back even if the
> > > locale has changed.
> >
> > OK. I think we can call that "serialization", in a canonical
> > locale-independent human-readable format.
> >
> > Both uses should be mentioned in the documentation. And the
> > documentation should clearly state that it's not for showing in your
> > application's UI.
>
> I'll make that clear in the doc.
>
> >
> > > If you want to take into account the locale, then you should use the
> > > GdaDataHandler which both takes into account the locale and any syntax
> > > specific to a DBMS. GdaDataHandler objects are created and managed by
> > > each provider and you can use them just after having obtained a
> > > pointer to one using gda_server_provider_get_data_handler_gtype() or
> > > gda_server_provider_get_data_handler_dbms().
> >
> > Is there documentation, or an example, of this somewhere?
> >
>
> There is only the gtk-doc generated documentation, section "Data
> conversions"; the GdaDataHandler object is fairly easy to use.

Well, you may want to add in the doc, that gda_value_stringify
function use the g_value_transform function inside, if the GValue type
has a registered function to converto to a String the it use that
function, if not uses a hard coded convertion in that function.

Then, if you want to convert i.e. a double to a string using you own
way, you can register your function in GLib using
g_value_register_transform_func, this override the actual conversion
in libgda (internaly cheks first if there is a function registered to
convert the given GValue type to a String)


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