[Zope-DB] Testing for empty result set

Charlie Clark charlie at egenix.com
Thu Mar 24 07:44:30 EST 2005

On 2005-03-24 at 10:45:07 [+0100], Martin Jennings <jennings at kpnqwest.ch> 
> Hello,
> thanks to the advice offered on this list some time ago, I have managed to
> get my zope/plone set-up to connect to an Oracle DB and extract data.
> Now all I have to do is test for an empty result set.
> I suppose that I do this using the tal:condition attribute, but am not
> sure what I am suppose to be testing.
> Any help would be more than welcome.
> Tank you in advance.


your right tal:condition is what you should be using. However, as 
Results-Objects with empty records are not None you still need a little 
Python test to get things to work correctly.

<div tal:condition="python: len(context.myZSQL())">

Should work


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