--- In firebird-support@yahoogroups.com, "tickerboo2002"
<egroup@...> wrote:

>
> Users of my app will be able to fill in parameters that go into a
> query to search for rows. The query has fixed parameters in the

where

> clause: i.e.
>
> where
> Co_name=:Co_Name and
> town=:town and
> Num_Employees=:Num_Employees
> etc
>
> Let's say the user is not interested in Num_Employees, is it

possilble

> to set the parameter so that clause is ignored?
>
> I assume for varchar entries I can just set Col=* (or is it %?)
>
> Thanks
>
> David
>

Make up a default value that can never occur in the field:

Where ((Co_Name = :Co_Name) or (:Co_name = '<<ANY>>'))
and ((town = :town) or (:town = '<<ANY>>'))
and ((Num_employees=:Num_Employess) or (Num_employees = -1))

You'll have to make sure nobody ever enters <<ANY>> for a company or
town name, and that all companies have a positive number of
employees, of course.

Michael D. Spence
Mockingbird Data Systems, Inc.