[Zope] Detecting a NULL Value

[FLORAC Thierry]

On Fri, 2004-02-27 at 14:55, Asad Habib wrote:

> I have a field in my MySQL database which is allowed to be null and has a
> value of NULL as default. I am retrieving this field and numerous others
> using a call to dtml-in. After the retrieval, I would like to determine
> what this value is inside my DTML document/method. What is the equivalent
> of NULL in Zope? Is it a value of 'None'?
> 
> I am using the following code but it doesn't work.
> 
> <dtml-if expr="undergraduate_projects_directed == 'None'">
>    <dtml-call "REQUEST.set('undergraduateProjectsDirected', 'Hello')">
> </dtml-if>


I use PostgreSQL and Oracle.
For each of them, I generally do this :

  <dtml-unless undergraduate_projects_directed>
    ...
  </dtml-unless>


Thierry

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