How do you handle a schema update?

• To: ozone-users@ozone-db.org
• Subject: How do you handle a schema update?
• From: Lars Schmidt-Thieme <lars.schmidt-thieme@wiwi.uni-karlsruhe.de>
• Date: Mon, 2 Oct 2000 09:42:58 +0200
• Delivered-To: softw7-ozone-db:org-ozone-users@ozone-db.org
• Reply-To: lars.schmidt-thieme@wiwi.uni-karlsruhe.de

Hi,

how do you handle a schema update in ozone? If I modify the classes
of persistent objects, I get a serialization exception. This is, what I have
done:

1. I implemented some database classes.
2. I set up the database and filled it with some objects.
3. I modified the database classes (added a new instance variable 
  and get/set-methods).
4. I tried to read an object stored in the database, but failed due to
  the serialization exception.

It looks like this cannot work. My question is, how can I "upgrade" the
persistent objects to the new classes (having null values for the new
instance variable, for example) ? 

Thanks in advance,
  Lars
-- 
Dr. Lars Schmidt-Thieme <Lars.Schmidt-Thieme@wiwi.uni-karlsruhe.de>
Institut für Entscheidungstheorie und Unternehmensforschung,
Universität Karlsruhe - Tel. 0721/608-8941

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