Message-ID: <49DBAF74.5020409@kickstone.com>
Date: Tue, 07 Apr 2009 20:54:28 +0100
From: John Lister <john.lister@kickstone.com>
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To: Merlin Moncure <mmoncure@gmail.com>
CC: Andrew Chernow <ac@esilo.com>, pgsql-hackers@postgresql.org
Subject: Re: Array types
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Cheers, nice to know it is possible... Now to see if i can get 
java/python to do the same :) or to use a modified libpq somehow...


Merlin Moncure wrote:
> On Tue, Apr 7, 2009 at 3:35 PM, John Lister
> <john.lister-ps@kickstone.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
>