NULL is a missing value ;-) You could test for it in dtml like so: <dtml-if "_.repr(ID) == 'Missing.Value'">... It's a bit fluffy but should give no problems. In python you would write: import Missing if ID is Missing.Value: do something To use the above in a PythonScript you need to setup module security, for instructions on that read /Products/PythonScripts/module_access_examples.py and then add the following: ModuleSecurityInfo('Missing').declarePublic('Value') Wolfram ----- Original Message ----- From: "Trevor Toenjes" <zope@toenjes.com> To: <zope@zope.org> Sent: Sunday, December 02, 2001 7:46 AM Subject: [Zope] testing for NULL

I am messing with TinyTablePlus which has NULL as the value for one of the ID column. How do I test for NULL?

<dtml-in expr="testtable.getRows()">

I have tried... <dtml-if "ID==''"> <dtml-if "ID=='Null'"> <dtml-if "ID==Null"> <dtml-if "ID==None">

I don't know if NULL is a string, a non-entity or what? Thanks, Trevor

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