From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
---|---|
To: | John Lister <john(dot)lister-ps(at)kickstone(dot)com> |
Cc: | Andrew Chernow <ac(at)esilo(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Array types |
Date: | 2009-04-07 19:44:29 |
Message-ID: | b42b73150904071244k35c139d5la58d064b31f2a32@mail.gmail.com |
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Lists: | pgsql-hackers |
On Tue, Apr 7, 2009 at 3:35 PM, John Lister
<john(dot)lister-ps(at)kickstone(dot)com> wrote:
> Does libpqtypes pass the array "over the wire" as an array? Ideally i'd like
> to do this with jdbc, but might give me a pointer...
We send/receive the server's array format. This is not quite a C
array, and is definitely not a java array. It's a packed postgres
specific (network byte order) format. It is much faster and tighter
than text in some cases however. We present an interface to copy C
arrays to postgres style formats such as:
PGarray a;
PQgetf(res, tuple_num, "%int4[]", field_num, &a);
This will 'pop' a result out of your result that presents the array
internals (which you could then loop).
merlin
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