Thread

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

Oliver Elphick <olly@lfix.co.uk> — 2004-09-14T20:59:17Z

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@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
GPG: 1024D/A54310EA  92C8 39E7 280E 3631 3F0E  1EC0 5664 7A2F A543 10EA
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