[Zope] Invalidating a ZSQL cache

[Kevin Carlson]

I have a situation where I would like to configure a ZSql query to keep 
itself cached, but occasionally have the need to invalidate the cached 
object and force the next result set to come from the database.  I have 
looked at the Da.py code and it looks like it would be possible to 
bypass the cache with a simple code modification, but that won't give me 
what I need entirely.

Any ideas?