cipo,
Unless I know what you are trying to do eg. what you want to do with the output parameter, I'll probably give you the wrong answer.
But the general pattern of a nuBuilder form is to edit a record. And at the point of saving those changes (as its being posted)
you can reference the values that you have put in the fields of that form (your input parameters) via hash variables..
eg. a field name of customer_id could be used as
$string = "SELECT * FROM customer WHERE customer_id = ''#customer_id#"; This would be in the
Before Save or
After Save sections of the form.
(
http://wiki.nubuilder.com/tiki-index.php?page=Forms%3A%20Edit%20Code&structure=nuBuilderDocs).
Again, you'll probably need to give me a more specific version of what you want to do..
Steven