From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
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To: | PFC <lists(at)peufeu(dot)com> |
Cc: | "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>, Waldomiro <waldomiro(at)shx(dot)com(dot)br>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: INSERT OU UPDATE WITHOUT SELECT? |
Date: | 2006-05-30 22:38:18 |
Message-ID: | 20060530223818.GK31547@surnet.cl |
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Thread: | |
Lists: | pgsql-performance |
PFC wrote:
> >PostgreSQL does not support MERGE at the moment, sorry.
>
> Issue an UPDATE, and watch the rowcount ; if the rowcount is 0,
> issue an INSERT.
> Be prepared to retry if another transaction has inserted the row
> meanwhile, though.
Oh, you mean, like the example that's in the documentation?
http://www.postgresql.org/docs/8.1/static/plpgsql-control-structures.html#PLPGSQL-ERROR-TRAPPING
Example 36-1
> MERGE would be really useful.
It has been discussed before -- MERGE is something different.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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