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Re: Another post 7.3.02 bug Was: ODBC and encodings problem

From: Marko Ristola <marko(dot)ristola(at)kolumbus(dot)fi>
To: pgsql-odbc(at)postgresql(dot)org
Subject: Re: Another post 7.3.02 bug Was: ODBC and encodings problem
Date: 2005-04-23 06:36:50
Message-ID: 4269ED02.80503@kolumbus.fi (view raw or flat)
Thread:
Lists: pgsql-odbc
I checked the ODBC 8.x CVS HEAD (source code). I found out, that it 
seems to work nicely
on Windows. I don't know anything about Linux ODBC driver side.

If the backend uses SQL_ASCII charset, it means, that the backend
does not know the charset of the non ASCII characters.
Pound character does not belong to those characters.

Correct way of fixing the bug is to tell for the backend server, that 
what charset is
used there. LATIN1 or UTF-8 are good alternatives.

So, if switching into LATIN1 as the backend charset works nicely, the 
ODBC driver
is okay: according to Philippe Lang, the charset switching works!

So the user must do an initdb.

It is very good, that the current ODBC driver handles data conversions
on the client side in Windows.

I found out this from the source code of CVS HEAD:

The ODBC driver uses ANSI C API for client charset. So ANSI C charset 
selection
(a C standard) works on Windows applications. This means, that C and C++ 
programs
do work. Other languages should work also.

With Windows applications, if an application uses different charsets in 
different threads,
the "global" charset selection applies, not one thread's private charset 
selection.

Regards,
Marko Ristola

Ben Trewern wrote:

>Does anyone have enough knowledge of the pgODBC driver to see where this bug 
>is coming from?  I've been looking through the code but can't get a handle 
>on how it is structured.  Are there any documents available which could give 
>me a starting point on kacking the driver.  I'm not a C coder so this is all 
>a learning experience.
>
>Ben
>
>"Ben Trewern" <ben(dot)trewern(at)mowlem(dot)com> wrote in message 
>news:d3ohub$och$1(at)news(dot)hub(dot)org(dot)(dot)(dot)
>  
>
>>I've looked at the mylog outputs from pgODBC in this case and they seem to 
>>show the driver (at some point) returns the correct values.  How these are 
>>then translated and shown in MS Access is beyond me.  I'll keep 
>>investigating though.
>>
>>[investigated some more]I just tried pgODBC 7.03.0208 and I get the 
>>correct result.  Seems it's another bug that's been introduced after this 
>>time. I'll look to see which version is the earliest to cause this 
>>problem.
>>
>>Ben
>>
>>""Philippe Lang"" <philippe(dot)lang(at)attiksystem(dot)ch> wrote in message 
>>news:6C0CF58A187DA5479245E0830AF84F42143227(at)poweredge(dot)attiksystem(dot)ch(dot)(dot)(dot)
>>    
>>
>>>There is a project of an ODBC driver that uses libpq at Command Prompt...
>>>
>>>This is an answer I got a few weeks ago.
>>>
>>>      
>>>
>>>>Our driver is sorely outdated. We are currently working on a brand new
>>>>(as in from scratcH) open source driver sourced from libpq.
>>>>
>>>>Sincerely,
>>>>
>>>>Joshua D. Drake
>>>>Command Prompt, Inc.
>>>>        
>>>>
>>>We are all looking forward to trying it. But licencing and deadlines are 
>>>not really clear at the moment.
>>>
>>>Philippe
>>>
>>>
>>>-----Message d'origine-----
>>>De : pgsql-odbc-owner(at)postgresql(dot)org 
>>>[mailto:pgsql-odbc-owner(at)postgresql(dot)org] De la part de Ben Trewern
>>>Envoyé : vendredi, 15. avril 2005 13:15
>>>À : pgsql-odbc(at)postgresql(dot)org
>>>Objet : Re: [ODBC] ODBC and encodings problem
>>>
>>>Does this mean I have to initdb my cluster again?  I tried to do this on 
>>>windows with 'initdb --encoding=LATIN1' but it hang on 'selecting default 
>>>max_connections ...'  I'm looking into this now.  Not sure if it's an 
>>>encoding problem or something else.
>>>
>>>What I was wondering was, why does the ODBC driver act differently to 
>>>Zeos or pgAdmin III?  Zeos and pgAdmin both use the libpq client library 
>>>which I suppose is the standard.  Is there a way the ODBC driver could be 
>>>hacked to give the same response as libpq or am I simplifying this too 
>>>much.
>>>
>>>Ben
>>>
>>>""Philippe Lang"" <philippe(dot)lang(at)attiksystem(dot)ch> wrote in message 
>>>news:6C0CF58A187DA5479245E0830AF84F4214321E(at)poweredge(dot)attiksystem(dot)ch(dot)(dot)(dot)
>>>      
>>>
>>>>Hi,
>>>>
>>>>I don't know exactly which encoding you need, but at least for french,
>>>>encoding a datatabase in LATIN1 solves the problem...
>>>>
>>>>Bye
>>>>
>>>>Philippe
>>>>
>>>>-----Message d'origine-----
>>>>De : pgsql-odbc-owner(at)postgresql(dot)org
>>>>[mailto:pgsql-odbc-owner(at)postgresql(dot)org] De la part de Ben Trewern
>>>>Envoyé : jeudi, 14. avril 2005 21:20 À : pgsql-odbc(at)postgresql(dot)org
>>>>Objet : [ODBC] ODBC and encodings problem
>>>>
>>>>Hi all,
>>>>
>>>>Using PostgreSQL 8.0.1 on Linux
>>>>
>>>>I've got a database with an encoding of SQL_ASCII.  I've accessed it
>>>>with pgAdmin III and Delphi through ZeosDBO and had no problems.  Now
>>>>I've been using MS Access XP with pgODBC version 8.00.0101 to connect
>>>>to it with some success till now.  I've noticed that any field with a
>>>>£ sign in it is not displaying correctly, I get 'WO ô,658.06' instead of 
>>>>'WO £4,658.06'
>>>>and 'WO ÷60.56' instead of 'WO £128.88' etc.  I assume it's something
>>>>to do with the encodings used server side or client side.
>>>>
>>>>Any ideas how to fix this?
>>>>
>>>>Regards,
>>>>
>>>>Ben
>>>>
>>>>
>>>>
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>>>>
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>>    
>>
>
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