[Dev] Re: Chandler Query Proposal 0.1

[Ted Leung]

On Feb 25, 2004, at 12:48 PM, Don Dwiggins wrote:

> I think you need to offer both options, to allow the system's user (the
> application programmer) to make the tradeoff.  Of course, if you can 
> give a
> rough hint, that might be useful in some cases.  (In the API I was 
> using,
> the result set object is specified so that the "number of rows" 
> attribute is
> only guaranteed accurate when the last row is accessed, either by 
> iterating
> through the rows or doing a "move to last" operation.)

Actually this is probably not hard.  The "wait till it's done w/ 
accurate size"
version could be a decorator of the streaming one.  If you decided you 
really needed
exact info all the time, you would just construct this decorator with 
the streaming
implementation as an argument.  The decorator just forces the 
generator/iterator to
exhaust itself before returning any data.

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Ted Leung                 Open Source Applications Foundation (OSAF)
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