sergiogarciaruso wrote:

> --- In IBObjects@yahoogroups.com, Helen Borrie <helebor@...> wrote:
>> At 10:00 AM 21/02/2006, you wrote:
>>> Hi.
>>> How can I create persistent fields with a TIB_Query component? I'm
> using D7
>>> and IBO v4.5.0
>> TIB_Query doesn't support persistent fields. (TIBOQuery does.)
>>
>> Can you explain what you need to do?
>>
>> Helen
>>
> Well, I need to write an OnChange event handler to respond to some
> changes in the field's data. I did it using TIBOQuery, but I want to
> use iboControls's components, and they doesn't work with native
> TDatasource component.
> Regards,
> Sergio
>

Two possibilities:

1) OnValidateField - Event of TIB_Query

2) OnAfterModify - Event of TIB_Column (=Field),
put the assignment in the OnAfterPrepare - Event of TIB_Query, like:
ib_query.FieldByName('MyField').OnAfterPrepare := DoOnChangeMyField;

Andreas