Обсуждение: pg_dumpall: pg_conversion table not saved
Hi list, I updated pg_converion to set the condefault=false where I need it. pg_dumpall does NOT write that table out and therefore it is not possible to restore, this update get lost. Anybody know if this is an error or has an explanation why it has to work this way? Background: I have created my own conversion with CREATE DEFAULT CONVERSION ... http://www.postgresql.org/docs/8.3/interactive/sql-createconversion.html > There should be only one default encoding in a schema for the encoding pair Why can not the "CREATE DEFAULT CONVERSION ..." a) return with an error if there is another default conversion existing or b) silently set any other default to false for the confor- and conto-encoding involved? Regards, Michael -- Wincor Nixdorf International GmbH Sitz der Gesellschaft: Paderborn Registergericht Paderborn HRB 3507 Gesch�ftsf�hrer: Eckard Heidloff (Vorsitzender), Stefan Auerbach, Dr. J�rgen Wunram Vorsitzender des Aufsichtsrats: Karl-Heinz Stiller Steuernummer: 339/5884/0020 - Ust-ID Nr.: DE812927716 - WEEE-Reg.-Nr. DE44477193 Diese E-Mail enth�lt vertrauliche Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrt�mlich erhaltenhaben, informieren Sie bitte sofort den Absender und vernichten Sie diese E-Mail. Das unerlaubte Kopieren sowie dieunbefugte Weitergabe dieser E-Mail ist nicht gestattet. This e-mail may contain confidential information. If you are not the intended recipient (or have received this e-mail inerror) please notify the sender immediately and destroy this e-mail. Any unauthorised copying, disclosure or distributionof the material in this e-mail is strictly forbidden.
Michael Enke <michael.enke@wincor-nixdorf.com> writes:
> I updated pg_converion to set the condefault=false where I need it.
Why are you needing to replace an existing default conversion?
Do we have a bug in it?
> pg_dumpall does NOT write that table out and therefore it is not possible to restore, this update get lost.
pg_dump does not (and shouldn't) dump system-defined objects. It has
no way to know that you modified the definition of such an object.
> Why can not the "CREATE DEFAULT CONVERSION ..."
> a) return with an error if there is another default conversion existing or
AFAICS it does.
regards, tom lane
On Wed, May 07, 2008 at 05:38:12PM -0400, Tom Lane wrote: > Michael Enke <michael.enke@wincor-nixdorf.com> writes: > > I updated pg_converion to set the condefault=false where I need it. > > Why are you needing to replace an existing default conversion? > Do we have a bug in it? He doesn't really. See his message two days ago about wanting to add another charset. Since postgresql doesn't support that he hijacked an existing one and replaced the conversion functions. And they're not saved/restored. Have a nice day, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > Please line up in a tree and maintain the heap invariant while > boarding. Thank you for flying nlogn airlines.
Вложения
Tom Lane schrieb: > Michael Enke <michael.enke@wincor-nixdorf.com> writes: >> I updated pg_converion to set the condefault=false where I need it. > > Why are you needing to replace an existing default conversion? > Do we have a bug in it? No, not a bug. But I need CP852 encoding conversion. Maybe you can take a look at http://archives.postgresql.org/pgsql-general/2008-05/msg00185.php and give your comment. Is the CREATE CONVERSION only for the case that there is a bug in existing default conversions? ;-) >> pg_dumpall does NOT write that table out and therefore it is not possible to restore, this update get lost. > > pg_dump does not (and shouldn't) dump system-defined objects. It has > no way to know that you modified the definition of such an object. > >> Why can not the "CREATE DEFAULT CONVERSION ..." >> a) return with an error if there is another default conversion existing or > > AFAICS it does. You can try with attached library: CREATE FUNCTION utf82cp852(integer,integer,cstring,internal,integer) RETURNS void AS '/tmp/libencodings' LANGUAGE 'C'; CREATE FUNCTION cp8522utf8(integer,integer,cstring,internal,integer) RETURNS void AS '/tmp/libencodings' LANGUAGE 'C'; CREATE DEFAULT CONVERSION utf82cp852 FOR 'UNICODE' TO 'LATIN2' FROM utf82cp852; CREATE DEFAULT CONVERSION cp8522utf8 FOR 'LATIN2' TO 'UNICODE' FROM cp8522utf8; It doesn't complain but it also is not the encoding used now since utf8_to_iso_8859_2 / iso_8859_2_utf8 has still condefault=true. If I now set condefault to false, my conversion function is used. Regards, Michael -- Wincor Nixdorf International GmbH Sitz der Gesellschaft: Paderborn Registergericht Paderborn HRB 3507 Geschäftsführer: Eckard Heidloff (Vorsitzender), Stefan Auerbach, Dr. Jürgen Wunram Vorsitzender des Aufsichtsrats: Karl-Heinz Stiller Steuernummer: 339/5884/0020 - Ust-ID Nr.: DE812927716 - WEEE-Reg.-Nr. DE44477193 Diese E-Mail enthält vertrauliche Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhaltenhaben, informieren Sie bitte sofort den Absender und vernichten Sie diese E-Mail. Das unerlaubte Kopieren sowie dieunbefugte Weitergabe dieser E-Mail ist nicht gestattet. This e-mail may contain confidential information. If you are not the intended recipient (or have received this e-mail inerror) please notify the sender immediately and destroy this e-mail. Any unauthorised copying, disclosure or distributionof the material in this e-mail is strictly forbidden.