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From: Paul M. Aoki <aoki@cs.berkeley.edu>
To: Gatto <gatto@dss.inpe.br>
Cc: postgres@postgres.Berkeley.EDU
Subject: Re: bytea built-in type
Date: Tue, 29 Nov 94 03:47:10 -0800
Message-ID: <199411291147.DAA19763@faerie.CS.Berkeley.EDU> (raw)
In-Reply-To: <9411291121.AA05008@dss.inpe.br>

gatto@dss.inpe.br (Gatto) writes:
> I have class MSG with a bytea (variable length array of bytes) field, and 
> I need to add instances to it trough a C source code using LIBPQ functions. 
> This field can contain zero values, and I don't know how to build a query 
> string, to use in PQexec, that doesn't finish when a zero value occours in
> some position (not the last) of this field. 

the base variable-length types (bytea, text) are implemented in 
src/backend/utils/adt/varlena.c.

it looks like bytea takes constants of the form \xxx where xxx is an
octal constant and must have exactly three digits.
--
  Paul M. Aoki          |  University of California at Berkeley
  aoki@CS.Berkeley.EDU  |  Dept. of EECS, Computer Science Division (#1776) 
                        |  Berkeley, CA 94720-1776

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