| From: | Bruno Wolff III <bruno(at)wolff(dot)to> |
|---|---|
| To: | "G(dot) Ralph Kuntz, MD" <grk(at)usa(dot)net> |
| Cc: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Q: insert/update in same statement |
| Date: | 2003-09-13 20:22:28 |
| Message-ID: | 20030913202228.GA25132@wolff.to |
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| Lists: | pgsql-sql |
On Fri, Sep 12, 2003 at 10:55:17 -0700,
"G. Ralph Kuntz, MD" <grk(at)usa(dot)net> wrote:
> Is it possible to make a single SQL statement that will insert a row
> if it does not already exist, otherwise it will just update the
> fields?
No.
> Actually, just a statement that will not give an error about duplicate
> keys would be enough for my application.
This you can do by using a select statement that checks if the primary
key is a duplicate on the insert statement. An example was posted on
one of the lists about a week ago.
Note that there are conncurrency issues with doing this. Either you want
to exclusively lock the table or use serializable isolation and be
prepared to retry after failures.
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