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Re: nextval() clarification

From: Ron St-Pierre <rstpierre(at)syscor(dot)com>
To: Greg Donald <destiney(at)gmail(dot)com>,pgsql-novice <pgsql-novice(at)postgresql(dot)org>
Subject: Re: nextval() clarification
Date: 2004-09-13 22:01:10
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Lists: pgsql-novice
Greg Donald wrote:

>On Mon, 13 Sep 2004 21:54:11 +0200, Ennio-Sr <nasr(dot)laili(at)tin(dot)it> wrote:
>>I think you should put <nextval(....)> directly into the INSERT
>>instruction, so that it advances only once per added record.
>>Have a look at Documentation PostgreSQL 7.4, Ch 9.11, table 9.34.
>I would but then I don't know how to ensure I return that exact same
>id from the insert, like mysql_insert_id() does.  That's the whole
>reason why I aquire the id first, so I know what it is after the
>insert.  SELECT max(id) would be off under load I think.
>I just didn't understand why it appeared to be +2 and not +1 as a
>novice might expect.  But now I get it.  Thanks to all.
After your insert statement, you can call CURRVAL to find out what the 
value was that you
inserted into the serial column.

eg SELECT currval('companies_company_id_seq'::text)


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