[Zope] how to check if the ResultSet is null?

[Robert Wohlfahrt]

Hi,

> 
> Hi, I stuck on a problem: I am creating a registration form. I need
> to check if the person info has already in database. I created a Z SQL
> method which I used "select usr_email from info(table name) where
> usr_email = <dtml-sqlvar usr_email type=string>" I want to call this
> method from my dtml method and see if it returns "null". But I'm not
> sure how to implement this. In Java, it has ResultSet which I can

let's say, you called your ZSQL-method "getThisAddress"

then you can do something like this:

<dtml-if getThisAddress>
	You are already in the database
</dtml-if>

Robert
-- 
Robert Wohlfahrt (robert.wohlfahrt@sachsen-net.com)
Tel: 0179 / 2980074 Fax: 0351 / 2880145