Re: NEW used in a query that is not in a rule

On Tue, 2004-09-14 at 19:34, Gaetano Mendola wrote:
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> Hi all,
> I'm bouncing on the following problem, I don't know if is a bug or if exist a different
> way to do it.
> The following code is not meaningfull but it's an extract of what I'm trying to do:
>
>
> CREATE TABLE foo ( field1 INTEGER );
>
> CREATE OR REPLACE FUNCTION trigger_foo()
> RETURNS TRIGGER AS'
> DECLARE
>
> ~ my_field TEXT;
> ~ my_stat TEXT;
>
> BEGIN
>
> ~ my_field = TG_ARGV[0];
>
> ~ my_stat = ''SELECT field1 FROM foo where field1 = NEW.'' || my_field;

My guess is that you are having this problem because you are executing a
query referring to NEW rather than using it directly.

I don't think you can refer to NEW in a command string given to
EXECUTE. You probably need to set up an IF...ELSIF...ELSE...END IF
structure to get the value to put into the command string.

> ~ EXECUTE my_stat;
>
> ~ RETURN NEW;
>
>
> END;
> ' LANGUAGE 'plpgsql';
>
>
> CREATE TRIGGER check_foo
> BEFORE INSERT ON foo
> FOR EACH ROW EXECUTE PROCEDURE trigger_foo('field1');
>
> insert into foo values ( 3 );
>
>
> I got the error in the subject, it's like the EXECUTE open another contest and
> forget that is inside a rule.
>
> Any idea someone ?
>
>
>
>
> Regards
> Gaetano Mendola
>
>
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--
Oliver Elphick olly(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
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