Re: [gnome-db] Introspection - DataModel structures

[Murray Cumming <murrayc murrayc com>]

On Sun, 2004-04-25 at 18:01, Rodrigo Moya wrote:
> On Sun, 2004-04-25 at 17:46 +0200, Murray Cumming wrote:
> > On Fri, 2004-04-09 at 08:50, Vivien wrote:
> > > Yes, the number and type of columns returned for each schema should be the
> > > same for every provider (note that this is not yet the case and some work
> > > needs to be done on some of the providers).
> > > 
> > > The "format" of each returned data model for each schema is documented in
> > > libgda's doc (such as 
> > > http://www.gnome-db.org/docs/libgda/libgda-provider-class.html#LIBGDA-PROVIDER-GET-SCHEMA).
> > 
> > Are the types documented anywhere. For instance, when getting the
> > GDA_CONNECTION_SCHEMA_FIELDS, the field type column is of type
> > GDA_VALUE_TYPE_STRING, but I would expect it to be GDA_VALUE_TYPE_TYPE.
> > 
> > This looks like a bug to me.
> > 
> it should be GDA_VALUE_TYPE_TYPE, if the docs say _STRING, it's a bug
> there. AFAIK, all providers use the _TYPE one.

It's not documented anywhere as far as I can tell. The actual code
returns a _STRING, not a _TYPE. (At least for PostgresSQL).

> > > To cope with this problem in libmergeant (which uses get_schema a lot to
> > > build and maintain its dictionnary), I've created some functions which
> > > check that the returned data model in in the right "format" (see the
> > > mg_resultset_check_data_model() in mg-result-set.[ch ]).
> > 
> > Yes, looking at the use of that function, mergeant does seem to expect a
> > GDA_VALUE_TYPE_STRING, rather than a GDA_VALUE_TYPE_TYPE.
> > 
> hmm, this seems wrong. Vivien?

-- 
Murray Cumming
www.murrayc.com
murrayc murrayc com