Claudio,

> I've an xml with value's column and I don't know if a value is null.
> I make the where condition dinamically and i set the ? with the value
> in the xml.
> I can't do "DETRANSFER is null" or any other columns

since you are building the where condition dynamically, it should'nt be
that much of a problem to cater for the special case of null values;
after all you *already* are treating null differently, since you must
knwo when to call setNull.
I don't see any simpler way out, sorry.
Ciao
--
____
_/\/ando