"filtered view" upon lists?
steve at holdenweb.com
Tue Sep 12 21:50:12 CEST 2006
Wildemar Wildenburger wrote:
> Steve Holden wrote:
>>> I think SQL views are the direct analog.
>> I don't think they are. If you add a non-conforming row to a SQL view
>> it doesn't appear int he view. If you modify a row in an updateable
>> view so it no longer confirms with the view's conditions it disappears
>> from the view.
> Me and my wording again: I typed 'direct analog' but meant 'somewhat
>> Also you don't say whether changes to l are supposed to be reflected
>> in f in the same way that changes to f are reflected in l.
> Right. Yes, the synchronicity (a word?) is meant to be in both directions.
>> It might be better if you were to explain your use case: what is this
>> beast supposed to be for?
> I have a database of interconnected objects. Each object has a list
> tuples; these tuples hold references to other objects and details about
> the type of connection.
> The 'views' I am imagining are sub-lists of this one list, based on the
> connection types. Order is important here, that's why I'm not using sets.
> BTW: I have gone the way of nested lists before and found it too rigid
> and complicated to use.
>>> A bit clearer now?
>> Hardly at all. Frankly it doesn't seem as though you really know what
>> the specifications are yourself, so you can hardly expect us to divine
>> them by use of our psychic powers. Besides which, psychic powers cost
>> extra ;-)
> Right again. I'm not sure what I want yet as I'm still exploring ideas.
> If something /like/ the above had existed (which by now I'm gathering is
> not the case) I'd just adapted my ideas to the specs given.
>> So give us that use case so we get a bit more insight into why you
>> even see the need for such a thing and how you want it ti behave. Or
>> is all this just theoretical?
> No no, its very much real. Just not as fleshed out as it might be ---
> I'm sort of an explorative coder; I usually don't know how something is
> going to work until it works.
That's all very well, but you might want to Google for "YAGNI". You
still haven't given us mcuh of a clue about the real need.
> Thx for the effort :)Happy to (tray to) help.
Steve Holden +44 150 684 7255 +1 800 494 3119
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