From: Bruce Momjian <maillist@candle.pha.pa.us>
To: daveh@insightdist.com
Cc: hannu@trust.ee
Cc: byronn@insightdist.com
Cc: pgsql-hackers@postgreSQL.org
Cc: pgsql-interfaces@postgreSQL.org
Subject: Re: [HACKERS] Re: [INTERFACES] retrieving varchar size
Date: Thu, 23 Apr 1998 17:09:40 -0400 (EDT)
Message-ID: <199804232109.RAA08650@candle.pha.pa.us> (raw)
In-Reply-To: <353F96B3.E75DB188@insightdist.com>
> > The information you want is in pg_attribute.atttypmod. It is normally
> > -1, but is set for char() and varchar() fields, and includes the 4-byte
> > length. See bin/psql/psql.c for a sample of its use.
>
> I see everyone writing in terms of length. You do mean precision, don't
> you? For our purposes, this precision should arrive in the result
> header. (redundancy in each tuple could be over looked) The goal is to be
> able to put realistic bounds on memory allocation before the entire result is
> read in. For this to work, functions must also be able to propagate the
> their precision.
>
> Did I spell doom to this idea?
Hmm. The problem is that many of us use the old 'text' type, which
doesn't have a defined length. Not sure how to handle this in a
portable libpq way?
--
Bruce Momjian | 830 Blythe Avenue
maillist@candle.pha.pa.us | Drexel Hill, Pennsylvania 19026
+ If your life is a hard drive, | (610) 353-9879(w)
+ Christ can be your backup. | (610) 853-3000(h)
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To: pgsql-interfaces@postgresql.org
Cc: maillist@candle.pha.pa.us, daveh@insightdist.com, hannu@trust.ee, byronn@insightdist.com, pgsql-hackers@postgreSQL.org
Subject: Re: [HACKERS] Re: [INTERFACES] retrieving varchar size
In-Reply-To: <199804232109.RAA08650@candle.pha.pa.us>
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