Hi, Jason

Try in TIB_QUERY.
Field(varchar or integer) is NOT NULL in Firebird 2.5. ok ?

If field is Null then can change.
If field contains value can not change.

There property in IB_QUERY to do this.

abs
Marcilio Soares

--- In IBObjects@yahoogroups.com, "Support List" <supportlist@...> wrote:
>
> > Where is set field change "only is null" ?
> > Exists this property in to tibquery ?
>
> I'm not sure I understand your question.
>
> Please clarify what you are trying to accomplish.
>
> Also, do you mean TIB_Query or TIBOQuery?
>
> Thanks,
> Jason
>