Marco,

> > When you edit a string field in a data-aware control, it becomes
> > non-null and stays like that event when you clear it; you need to
> issue
> > the Clear method of the field object to set the field to null.
> > --
>
> ColumnAttributes "BLANK IS NULL" should do the job, but my experience
> is that it does not, at least with data type that have a domain (and
> which attributes are read from the DDL structure of the database).

I can't really say; I was talking about TIBODataSet which I am working
with these days.
I haven't had the chance to use BLANKISNULL on native datasets so far,
sorry.
Ciao
--
____
_/\/ando