| From: | Thomas Kellerer <spam_eater(at)gmx(dot)net> |
|---|---|
| To: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: fast insert-if-key-not-already-there |
| Date: | 2008-08-04 15:55:32 |
| Message-ID: | g778pk$2rq$1@ger.gmane.org |
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| Lists: | pgsql-sql |
Patrick Scharrenberg, 04.08.2008 17:51:
> Hi!
>
> I have to do much inserts into a database where the key most often is
> already there.
> My current approach is to query for the key (ip-address), and if the
> result is null I do the insert.
> For every IP-Address I need the ip_addr_id from the same table.
>
> [...]
>
> Now I'm wondering if there is a better solution, since I'm doing ~20
> inserts at once and every time I'm doing single lookup's for the IDs.
If you know that most of the time the record is already there, I simply execute the UPDATE, then check how many rows were updated. If that returns zero, I'll send the INSERT
Regards
Thomas
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