From: Gary Stainburn <gary.stainburn@ringways.co.uk>
To: 'Tom Lane' <tgl@sss.pgh.pa.us>
Cc: 'Pgsql Interfaces' <pgsql-interfaces@postgresql.org>
Subject: RE: [INTERFACES] locking on database updates
Date: Tue, 7 Dec 1999 19:36:41 -0000
Message-ID: <01BF40EA.63E2DC00@garys.ringways.co.uk> (raw)
-----Original Message-----
From: Tom Lane [SMTP:tgl@sss.pgh.pa.us]
Sent: Tuesday, December 07, 1999 6:00 PM
To: Ross J. Reedstrom
Cc: Gary Stainburn; 'Pgsql Interfaces'
Subject: Re: [INTERFACES] locking on database updates
|"Ross J. Reedstrom" <reedstrm@wallace.ece.rice.edu> writes:
|> create table foo (bar serial, baz text);
|> insert into foo (baz) values ('wooble');
|> select currval('foo_bar_seq');
|
|I don't think this is safe in a multi-client environment;
|what if someone else inserts at about the same time?
|
|Better to do
| select nextval('foo_bar_seq');
| insert into foo values (just-retrieved-value, 'wooble');
|which is safer and probably marginally faster (since the
|sequence object is touched only once, not twice).
|
| regards, tom lane
Perfect - exactly what I need. Another fine day at the office.
-----------------------------------------
Gary Stainburn.
Work: http://www.ringways.co.uk gary.stainburn@ringways.co.uk
REVCOM: http://www.revcom.dhs.orghttp://www.revcom.org.uk gary.stainburn@revcom.org.uk
-----------------------------------------
The nice ones are always taken - anon
-----------------------------------------
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To: pgsql-interfaces@postgresql.org
Cc: gary.stainburn@ringways.co.uk, tgl@sss.pgh.pa.us
Subject: RE: [INTERFACES] locking on database updates
In-Reply-To: <01BF40EA.63E2DC00@garys.ringways.co.uk>
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