[Nottingham] SQLite and 'locking'

Martin Garton martin at stupids.org
Tue Feb 27 12:11:07 GMT 2007

On Tue, 2007-02-27 at 11:59 +0000, Martin wrote:
> Martin Garton wrote:
> > On Tue, 2007-02-27 at 11:21 +0000, Duncan John Fyfe wrote:
> > 
> >> If you use NULL to flag 'available' how do you record a seat as
> >> 'unavailable and not booked' (eg. seat 10 has been broken) ?
> >> Here is a new perfectly reasonable 'not booked' state.
> > 
> > Fair point.  For this simple example I was assuming the only reason a
> > seat would not be available was because it was booked.  How would you
> > handle this case?  With an additional "broken seats" table?
> Is this not all cleared up by using an enumerated status column?
> Then it's a simple case (later) to add new status options for additional
> states such as seat broken, seat too dirty, baby seat, oversized seat,
> ... all without breaking too much of the existing code.

How do you indicate a dirty baby seat?

In general i strongly dislike "status" fields and prefer separating
things into different fields in all but the most trivial of cases.


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