Hi Walter

> - does cakephp provide for event triggers, 

Do you mean on the client side?  If so, then the norm is to use 
Scriptaculous and Prototype to manage complex Javascript behavior on the 
client side as well as AJAX


> calculated fields,

Nope.  Code it yourself.  This sort of thing is trivial to do, so why 
weigh down the framework with it.  Ideally you would probably build a 
Cake Helper to deal with this if you were using it a lot.


> rollbacks?

No, Cake doesn't provide any functions for rollbacks.  However I would 
debate whether or not any framework should be involved with this.  My 
understanding of rollbacks is that they are intimately tied to the 
database, so if your database doesn't support rollbacks, then find a DB 
that does.  If your database does (support rollbacks), then given that 
Cake allows you to execute any SQL that you like, you can take advantage 
of the DB's features.

Regards,
Langdon

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