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* ECPG and bytea
@ 2003-06-26 16:37 Lee Kindness <lkindness@csl.co.uk>
0 siblings, 1 reply; 2+ messages in thread
From: Lee Kindness @ 2003-06-26 16:37 UTC (permalink / raw)
To: pgsql-hackers@postgresql.org; pgsql-interfaces; +Cc: Lee Kindness <lkindness@csl.co.uk>
Guys, surely some one's done this before? I've tried using
PQescapeBytea too, but still get (slightly) different output. If I try
and insert "\x02\x01\x02\x03\x04hello\x05\x64\x99\x45" I get (int
values of chars printed):
INSERT: 2 1 2 3 4 104 101 108 108 111 5 100 -103 69
SELECT: 2 1 2 3 4 104 101 108 108 111 5 100 92 50 51 49 69
hoping someone has a quick answer... if not I'll post a full source
example and look into it more...
Thanks, L.
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: [HACKERS] ECPG and bytea
@ 2003-06-26 17:04 Joe Conway <mail@joeconway.com>
parent: Lee Kindness <lkindness@csl.co.uk>
0 siblings, 0 replies; 2+ messages in thread
From: Joe Conway @ 2003-06-26 17:04 UTC (permalink / raw)
To: Lee Kindness <lkindness@csl.co.uk>; +Cc: pgsql-hackers@postgresql.org; pgsql-interfaces
Lee Kindness wrote:
> Guys, surely some one's done this before? I've tried using
> PQescapeBytea too, but still get (slightly) different output. If I try
> and insert "\x02\x01\x02\x03\x04hello\x05\x64\x99\x45" I get (int
> values of chars printed):
>
> INSERT: 2 1 2 3 4 104 101 108 108 111 5 100 -103 69
> SELECT: 2 1 2 3 4 104 101 108 108 111 5 100 92 50 51 49 69
>
> hoping someone has a quick answer... if not I'll post a full source
> example and look into it more...
>
I don't know much about ecpg, but here are some thoughts:
regression=# select x'99'::int;
int4
------
153
(1 row)
regression=# select chr(-103) = chr(153);
?column?
----------
t
(1 row)
So the insert looks correct but affected by signed vs unsigned char somehow.
As far as the select goes, I'm wondering if your database is using UTF8
encoding or something like that. That would explain a high bit character
getting converted to 4 bytes, I think.
HTH,
Joe
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2003-06-26 16:37 ECPG and bytea Lee Kindness <lkindness@csl.co.uk>
2003-06-26 17:04 ` Joe Conway <mail@joeconway.com>
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