That second typed aproach works, the other one would cough up on trying to
initialize BindParamClause.
Quoting Michael Bayer <[EMAIL PROTECTED]>:
>
> havent tried either of these, but you could try jacking up BindParamClause:
>
> class CallableBind(sql.BindParamClause):
> def __init__(self, callable, name):
> super(CallableBind, self).__init__(name, None)
> self.callable = callable
> value = property(lambda s:s.callable())
>
> s = foo.select(foo.c.bar == CallableBind(somecallable, 'val'))
>
> that should run the callable not exactly on each execute but on each
> compilation.
>
> or maybe you could do it via types:
>
> class CallableType(types.String):
> def __init__(self, callable):
> self.callable = callable
> def convert_bind_param(self, value, e):
> return self.callable()
>
> s = foo.select(foo.c.bar == bindparam('val', None,
> type=CallableType(somecallable))
>
> just some ideas.
>
> Florian Boesch wrote:
> > can I construct a select which gets the value it selects against from a
> > callable
> > each time it is executed?
> >
> > i.e.
> >
> > foo.select(foo.c.bar == fun(somecallable))
> >
> > cheers,
> > Florian
> >
> >
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