Обсуждение: Move data between two databases SQL-ASCII to UTF8

I need to convert my database to UTF8. Is there a way to do a SELECT ... INSERT from the old database table to the new one? Would the INSERT correct data errors between the two data types? I only have 10 tables and the biggest has < 8000 rows.  

Running Version 8.1.4 on Redhat 9
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Margaret Gillon, IS Dept., Chromalloy Los Angeles, ext. 297

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2007/2/8, MargaretGillon@chromalloy.com <MargaretGillon@chromalloy.com>:
>
> I need to convert my database to UTF8. Is there a way to do a SELECT ...
> INSERT from the old database table to the new one? Would the INSERT correct
> data errors between the two data types? I only have 10 tables and the
> biggest has < 8000 rows.

Use pg_dump to dump the db and use iconv on the generated file:

iconv -f ASCII -t UTF-8 mydb.dump -o mydb_utf8.dump

<GUESS>
If the characters are strictly ASCII (<=127) then the conversion will
not be necessary. But if there are characters bigger than 127 then the
conversion will have to be made from iso-8859-1 to utf-8:

iconv -f ISO_8859-1 -t UTF-8 mydb.dump -o mydb_utf8.dump
</GUESS>

Regards,
--
Clodoaldo Pinto Neto

On 2/8/07, Clodoaldo <clodoaldo.pinto.neto@gmail.com> wrote:
Wouldn't it be adequate to set the client encoding to SQL_ASCII in the dump file (if that was infact the encoding on the original database)?

SET client_encoding TO SQL_ASCII;

And then let the database do the conversion?  I would think since the db is UTF8 and the client is claiming SQL_ASCII then it would convert the data to UTF8.

I have done this in the past with SQL dumps that had characters that UTF8 didn't like, and I just added the "SET client_encoding TO LATIN1;" since I knew the source encoding was LATIN1.


--
Chad
http://www.postgresqlforums.com/

On Thu, Feb 08, 2007 at 08:22:40PM -0500, Chad Wagner wrote:
> On 2/8/07, Clodoaldo <clodoaldo.pinto.neto@gmail.com> wrote:
> >Use pg_dump to dump the db and use iconv on the generated file:
> >
> >iconv -f ASCII -t UTF-8 mydb.dump -o mydb_utf8.dump

Converting the data from ASCII to UTF-8 doesn't make much sense:
if the data is ASCII then it doesn't need conversion; if the data
needs conversion then it isn't ASCII.

> Wouldn't it be adequate to set the client encoding to SQL_ASCII in the dump
> file (if that was infact the encoding on the original database)?

http://www.postgresql.org/docs/8.2/interactive/multibyte.html#AEN24118

"If the client character set is defined as SQL_ASCII, encoding
conversion is disabled, regardless of the server's character set."

As Clodoaldo mentioned, if the data is strictly ASCII then no
conversion is necessary because the UTF-8 representation will be
the same.  If you set client_encoding to SQL_ASCII and the data
contains non-ASCII characters that aren't valid UTF-8 then you'll
get the error 'invalid byte sequence for encoding "UTF8"'.  In that
case set client_encoding to whatever encoding the data is really
in; likely guesses for Western European languages are LATIN1, LATIN9,
or perhaps WIN1252.

--
Michael Fuhr