On Wednesday 19 November 2008 08:48:34 am Ed Leafe wrote:
> On Nov 19, 2008, at 10:41 AM, johnf wrote:
> > Learn something new everyday. Would you explain how the compound
> > key works
> > for the benefit of others (maybe I'm the only one that does not know).
> > Where/how does the PK get updated on a new()? Can the compound PK
> > be of any
> > data types? So if I wanted Invoice# and Location as my PK and
> > Invoice# = int
> > and Location = str can I mix the two?
>
> Sure. Dabo uses a tuple internally. This method from dCursorMixin
> should clarify:
>
> def pkExpression(self, rec=None):
> """Returns the PK expression for the passed record."""
> if rec is None:
> try:
> rec = self._records[self.RowNumber]
> except IndexError:
> rec = {}
> if isinstance(self.KeyField, tuple):
> pk = tuple([rec[kk] for kk in self.KeyField])
> else:
> pk = rec.get(self.KeyField, None)
> return pk
>
>
>
>
> -- Ed Leafe
Thanks
--
John Fabiani
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