RE: [INTERFACES] locking on database updates

-----Original Message-----
From: Tom Lane [SMTP:tgl(at)sss(dot)pgh(dot)pa(dot)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(at)wallace(dot)ece(dot)rice(dot)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.
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Gary Stainburn.
Work: http://www.ringways.co.uk gary(dot)stainburn(at)ringways(dot)co(dot)uk
REVCOM: http://www.revcom.dhs.org http://www.revcom.org.uk gary(dot)stainburn(at)revcom(dot)org(dot)uk
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The nice ones are always taken - anon
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