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* Explicitly rolling back transaction from within a C-Language function
@ 2004-11-24 19:23 Mark Dilger <markdilger@yahoo.com>
0 siblings, 1 reply; 2+ messages in thread
From: Mark Dilger @ 2004-11-24 19:23 UTC (permalink / raw)
To: pgsql-sql
Hello,
I have a transactional system built on top of
BerkeleyDB which I would like to call from within
Postgres through a C-Language function. The behavior
of the function will be read-only. Even so, the
BerkeleyDB-based system's transaction will sometimes
fail. What I would like to do is propogate that
transactional failure into the Postgres transaction
that called the C-Language function. Is this
possible?
To clarify what I think I want: I would like the
C-Language function to return an error condition to
Postgres that will cause the current Postgres
transaction to abort. I do not know how to do this.
I am not particularly worried about needing to
rollback the BerkeleyDB transaction when the Postgres
transaction fails, because the BerkeleyDB transaction
was read-only anyway, and there are no updates to roll
back. However, I might want to do this in the future
so information on this subject is also welcome.
Thank you for any help,
mark
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^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Explicitly rolling back transaction from within a C-Language function
@ 2004-11-24 19:53 Michael Fuhr <mike@fuhr.org>
parent: Mark Dilger <markdilger@yahoo.com>
0 siblings, 0 replies; 2+ messages in thread
From: Michael Fuhr @ 2004-11-24 19:53 UTC (permalink / raw)
To: Mark Dilger <markdilger@yahoo.com>; +Cc: pgsql-sql
On Wed, Nov 24, 2004 at 11:23:30AM -0800, Mark Dilger wrote:
> To clarify what I think I want: I would like the
> C-Language function to return an error condition to
> Postgres that will cause the current Postgres
> transaction to abort. I do not know how to do this.
See the "Reporting Errors Within the Server" documentation:
http://www.postgresql.org/docs/7.4/static/error-message-reporting.html
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
^ permalink raw reply [nested|flat] 2+ messages in thread
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2004-11-24 19:23 Explicitly rolling back transaction from within a C-Language function Mark Dilger <markdilger@yahoo.com>
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