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Re: [HACKERS] Revised proposal for libpq and FE/BE protocol changes

From: dg(at)illustra(dot)com (David Gould)
To: ocie(at)paracel(dot)com
Cc: tgl(at)sss(dot)pgh(dot)pa(dot)us, pgsql-hackers(at)postgreSQL(dot)org, pgsql-interfaces(at)postgreSQL(dot)org
Subject: Re: [HACKERS] Revised proposal for libpq and FE/BE protocol changes
Date: 1998-04-29 05:32:33
Message-ID: 9804290532.AA19418@hawk.illustra.com (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-interfaces
> 
> Tom Lane wrote:
> > 
> > Here is a revised proposal that takes into account the discussions
> > of the last few days.  Any comments?
> 
> Just one at the end 
> 
> [snip]
> 
> > 4. The frontend may request cancellation of the current query by sending
> > a single byte of OOB (out-of-band) data.  The contents of the data byte
> > are irrelevant, since the cancellation will be triggered by the associated
> > signal and not by the data itself.  (But we should probably specify that
> > the byte be zero, in case we later think of a reason to have different
> > kinds of OOB messages.)  There is no specific reply to this message.
> > If the backend does cancel a query, the query terminates with an ordinary
> > error message indicating that the query was cancelled.
> 
> You didn't come right out and say it, but are you intending to support
> multiple queries within a connection?  I gather not.  Not that I'm
> suggesting that this be done, as it seems this would complicate the
> user's application and the backend.  With only one possible OOB
> message, you can't tell it which query to cancel.
> 
> Ocie Mitchell

Waves hand wildly... I know, I know!

   All of them!

-dg

David Gould            dg(at)illustra(dot)com           510.628.3783 or 510.305.9468 
Informix Software  (No, really)         300 Lakeside Drive  Oakland, CA 94612
"(Windows NT) version 5.0 will build on a proven system architecture
 and incorporate tens of thousands of bug fixes from version 4.0."
                 -- <http://www.microsoft.com/y2k.asp?A=7&B=5>

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