Re: Returning multiple result sets

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От Bruce Momjian
Тема Re: Returning multiple result sets
Дата
Msg-id 200511232022.jANKMia21318@candle.pha.pa.us
обсуждение исходный текст
Ответ на Re: Returning multiple result sets  (Tom Lane <tgl@sss.pgh.pa.us>)
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Tom Lane wrote:
> Martijn van Oosterhout <kleptog@svana.org> writes:
> > libpq supports it just fine. You do a PQsendQuery() and then as many
> > PQgetResult()s as it takes to get back the results. This worked for a
> > while AFAIK.
> 
> That only works if the caller is prepared to read each result serially,
> and not (say) a row at a time in parallel.  There are a bunch of
> ease-of-use problems as well, such as knowing which resultset is which,
> coping with errors detected after the first resultset(s) are sent, etc.
> 
> A more realistic way of dealing with multiple resultsets is to deliver
> them as named cursor references and allow the client to FETCH
> reasonable-sized chunks.  We can sort of handle this today, but it's
> notationally painful at both the stored-procedure and client ends.

Is there a TODO here?

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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