On Mon, Dec 02, 2002 at 09:53:39AM +0000, Nick Murtagh mentioned:
> I have a problem with this design - and it's mainly to do with the burp
> loudly part. If some intermediate layer or the application itself does
> validation, you can have the GUI give an error message explaining
> what went wrong and what to do about it. If the database "throws an
> exception", you have two choices. One, display the error message
> returned by the db, probably something along the lines of "Constraint
> violated ..." which won't mean anything to the average end user. Or try
> and parse the error messages from the database and report something
> sensible to the user.
>> You're always going to need to do some validation directly in the GUI,
> unless you want a really unusable GUI.
Of course. I don't think Ronan was suggesting otherwise. But, it's nice
to have validation in the database too, as you can add other frontends
without duplicating code.
I'm a big fan of validation on the far end of every data boundry, and in
this case, you have two boundries;
user->ui ui->database
If you just have validation in the UI, you aren't protected from bugs in
the UI creating an inconsistent database.
Of course, I've written triggers for SNMP database backend, so I'm messed
up to start with.
John, creator of numerous UIs with such bugs
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