On 11 April 2011 10:29, Murray Cumming <[email protected]> wrote: > On Sun, 2011-04-10 at 13:06 +0200, Murray Cumming wrote: >> On Sun, 2011-04-10 at 11:52 +0200, Murray Cumming wrote: >> > On Sat, 2011-04-09 at 18:39 +0200, Vivien Malerba wrote: >> > > On 8 April 2011 22:12, Murray Cumming <[email protected]> wrote: >> > > > GObject+Introspection is working quite well for me now with libgda. >> > > > Thanks. I am glad that pygda is now obsolete, so it's one less module >> > > > for me to maintain. >> > > > >> > > > However, I'm getting an error when trying to get the values from the >> > > > DataModel with get_value_at(). For instance, this script >> > > > http://git.gnome.org/browse/pygda/tree/examples/gda/select.py?h=introspection >> > > > produces this error: >> > > > >> > > > Traceback (most recent call last): >> > > > File "./select.py", line 61, in <module> >> > > > main () >> > > > File "./select.py", line 57, in main >> > > > print " value=", data_model.get_value_at(col_index, >> > > > row_index); >> > > > File "/opt/gnome230/lib/python2.7/site-packages/gi/types.py", line 44, >> > > > in function >> > > > return info.invoke(*args) >> > > > TypeError: unknown type (null) >> > > > >> > > > >> > > > Presumably it doesn't like GdaValues with GType=0 (when >> > > > gda_value_is_null(gvalue) is true). >> > > >> > > Yes, the a GValue with a 0 GType represents a SQL NULL value, whereas >> > > if the returned value is NULL (the C NULL) then it means there was an >> > > error retreiving the value, hence the difference between the 2. > > The PyGObject developers don't seem happy with this: > https://bugzilla.gnome.org/show_bug.cgi?id=647272#c2
I don't know why Libgda uses G_TYPE_INVALID instead of G_TYPE_NONE (some historical reason, lack of knowledge,...). > > Maybe it's something we can change in libgda-5.0. I guess that can be done, I have to check the impacts first. However I can't change the V4 behaviour, so for the GObject introspection, a solution needs to be found. Vivien _______________________________________________ gnome-db-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/gnome-db-list
