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Re: PQescapeByteaConn - returns wrong string for PG9.1 Beta3

From: Florian Pflug <fgp(at)phlo(dot)org>
To: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Cc: Petro Meier <petro85(at)gmx(dot)de>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: PQescapeByteaConn - returns wrong string for PG9.1 Beta3
Date: 2011-07-27 19:44:06
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Lists: pgsql-hackers
On Jul27, 2011, at 20:05 , Alvaro Herrera wrote:
> Excerpts from Petro Meier's message of miƩ jul 27 02:51:22 -0400 2011:
>> If  I use PQescapeByteaConn() for a conenction to a PG9.1 Beta3 server, 
>> this function returns (e.g.) "\xea2abd8ef31...(and so on.)...".        
>>        Here the problem: there should be a second backslash in the prefix. 
>> The SQL Statement which uses this string (INSERT statement in my case) 
>> returns with an error ("Invalid byte sequence..."). If I add the second 
>> backslash manually everything works fine.        
> You're just being bitten by the fact that the
> standard_conforming_strings setting changed its default from false to
> true.  If you want the old behavior, you can just flip the switch, but
> the recommended action is to change your expectations.  You can use E''
> if you want backslashes to continue working without changing the switch.

Hm, but PQescapeByteaConn() shouldn't produce a literal that the server
later rejects, no matter what standard_conforming_strings is set to.

It looks like PQescapeByteaConn() does the right thing here, though -
it doesn't escape the backslash in it's result when dealing with 9.1,
presumably because that server has wstandard_conforming_strings set to on.
But why then is the server rejecting the result?

The only way I can see that make that happend would be to prefix the
string returned by PQescapeByteaConn() with 'E'.

@OP: Could you post the code fragment that causes the error?

best regards,
Florian Pflug

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