Re: transaction

Hi,

You can achieve this by:

1. Create a new table
2. Insert the data in this.
3. Write a trigger on this table
4. In trigger issue UPDATE and check whether it updated any records. If NO,
fire INSERT.
( here, i am updating first and inserting.. just reverse )

The code looks like:

update tempxitag set qty = qty + nqty where
ccod = cccod
GET DIAGNOSTICS nFound = ROW_COUNT;
If nFound = 0 then
insert into tempxitag( ccod, qty)
values (cccod, nqty );
End if;

HTH

Denis

----- Original Message -----
From: Bruno Wolff III <bruno(at)wolff(dot)to>
To: H.J. Sanders <hjs(at)worldonline(dot)nl>
Cc: <pgsql-sql(at)postgresql(dot)org>
Sent: Wednesday, April 21, 2004 7:30 AM
Subject: Re: [SQL] transaction

> On Tue, Apr 20, 2004 at 21:14:48 +0200,
> "H.J. Sanders" <hjs(at)worldonline(dot)nl> wrote:
> >
> > Hello list.
> >
> > We are migrating from Informix to PSQL.
> >
> > In Informix we used to do:
> >
> > - BEGIN WORK
> >
> > - INSERT ROW
> >
> > - IF FAILED THEN UPDATE ROW
> >
> > - COMMIT WORK
> >
> >
> > In PSQL this does not seem to work because after the first error (the
> > insert)
> > everything is omitted.
> >
> > Has someone found a solution for this (we have 1000's of this type).
>
> This question has come up a few times over the last year and there isn't
> a great answer. Locking the table is a simple solution, but can lead to
> problems because of contention.
>
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