Validation against database: Form or Action?

[Scott Van Wart]

I have a number of scenarios where I need to validate against a set of 
rows in a database table.  For example, when logging in, it's all fine 
and dandy to make sure a username and password is entered in the 
ActionForm.validate method, but should database access go in the 
ActionForm?  If so, how do I return errors/messages back to the calling 
page from within the Action.execute method?

- Scott
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