Re: Err. compiling func. with SET TRANS...

On Tue, 26 February 2002, "Christopher Kings-Lynne" wrote:

>
> > CREATE FUNCTION simple_fun() RETURNS INTEGER AS '
> > BEGIN
> > SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
> > BEGIN;
> > SELECT 1;
> > END;
> > RETURN 1;
> > END;
> > ' LANGUAGE 'plpgsql';
> >
> > This is as simple as it gets.
> > I think my syntax is correct (I checked Practical PostgreSQL book
> > as well as a number of 7.2 PDF documents, etc.).
> >
> > Am I missing a secret ingredient here?
>
> I'm no PL/PgSQL expert, but I think that you cannot do transactions within a
> function (this is because postgres doesn't support nested transactions.
>
> However, since the function will run inside a transaction anyway, just do
> this:
>
> CREATE FUNCTION simple_fun() RETURNS INTEGER AS '
> BEGIN
> SELECT 1;
> RETURN 1;
> END;
> ' LANGUAGE 'plpgsql';
>
> Now, of course you can't do your isolated transaction, so you'll need to
> create the function above and then use it like this:
>
> BEGIN;
> SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
> SELECT simple_fun();
> COMMIT;

Hello Chris, thanks for the answer.
Ouch, what a workaround :(
Unfortunately, this doesn't seem to work either:

CREATE FUNCTION simple() RETURNS INTEGER AS '
BEGIN
RETURN 1;
END;
' LANGUAGE 'plpgsql';

CREATE FUNCTION simple_wrap() RETURNS INTEGER AS '
BEGIN
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SELECT simple();
COMMIT;
END;
' LANGUAGE 'plpgsql';

And this is the error:

=> select simple_wrap();
NOTICE: Error occurred while executing PL/pgSQL function simple_wrap
NOTICE: line 2 at SQL statement
ERROR: SET TRANSACTION ISOLATION LEVEL must be called before any query

Unfortunately, line numbers don't seem to be real line numbers, so I can't use them to find the error.

Any idea why the above doesn't work?

Thanks again,
Otis

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