Re: ODBC & character encoding

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От Iain
Тема Re: ODBC & character encoding
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Msg-id 002501c50cef$6a46f780$7201a8c0@mst1x5r347kymb
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Ответ на ODBC & character encoding  ("Layet Benjamin" <benjamin@moonfactory.co.jp>)
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Hi Benjamin,
 
I don't have direct experience of your exact situation, but I use a 7.1 database via ODBC. The difference is that the client is not unicode, it's plain old windows shift-JIS and that works fine iff you use the unicode support odbc driver. When you install the postgres ODBC driver it actually contains 3 drivers, which one are you using?
 
> Can the ODBC driver convert the query string from UTF8 to EUC_JP before sending it to the database server ?
 
I'm not sure...
 
> Can the ODBC driver take EUC_JP string as input ? (then I would 'just' have to figure out how to send EUC_JP stings from C#...) 
 
I dunno about that either, but it certainly accepts shift-JIS which is the native encoding for windows.
 
So far I've never had to pay much attention to client encoding (with the notable exception of getting input data from a web application) as the clients and drivers seem to work everything out by themselves.
 
Regards
Iain
 
 
----- Original Message -----
Sent: Monday, February 07, 2005 5:06 PM
Subject: Re: [ODBC] ODBC & character encoding

Hi,
Thank you Iain for your quick reply.
But unfortunately this did not solve the problem, 7.1 does not support this conversion neither yet. (7.3 and 7.4 do):
 
SET client_encoding='UNICODE';
ERROR:  Conversion between UNICODE and EUC_JP is not supported
 
In theory, I have 3 possible places to convert UTF8 to EUC_JP:
- 1 inside postgres
- 2 inside ODBC
- 3 inside C#
 
 
1
 
        C#                                    ODBC                 Postgres 7.1
Utf8                  l =============>  l                l =====>l UTF8->EUC_JP
(possible->Unicode)   l     UTF8        l                l UTF8  l
______________________l  (or Unicode)   l________________l       l_______________
 
 
2
        C#                                    ODBC                 Postgres 7.1
Utf8                  l =============>  l UTF8->EUC_JP   l =====>l
(possible->Unicode)   l     UTF8        l                l EUC_JPl
______________________l  (or Unicode)   l________________l       l_______________
 
 
3

        C#                                    ODBC                 Postgres 7.1
UTF8->EUC_JP          l =============>  l                l =====>l
(possible->Unicode)   l     EUC_JP      l                l EUC_JPl
______________________l                 l________________l       l_______________
 
 
Number 1 seem to be the normal solution, but it does not work with 7.1.
I would like to know if number 2 or 3 are possible:
so,
 - Can the ODBC driver convert the query string from UTF8 to EUC_JP before sending it to the database server ?
or
- Can the ODBC driver take EUC_JP string as input ? (then I would 'just' have to figure out how to send EUC_JP stings from C#...) 
 
Help extremely needed...
Thank you !
 
Benjamin
 

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