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
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