Re: How to access NEW or OLD field given only the field's name?

Hi,

Le 2014-03-19 à 16:19, Adrian Klaver a écrit :

> On 03/19/2014 12:48 PM, François Beausoleil wrote:
>>
>> Cross-posted from https://dba.stackexchange.com/questions/61271/how-to-access-new-or-old-field-given-only-the-fields-name
>>
>
>
> Well two things:
>
> 1) From the above link:
> Note that parameter symbols can only be used for data values — if you want to use dynamically determined table or column names, you must insert them into the command string textually. For example, if the preceding query needed to be done against a dynamically selected table, you could do this:

Is there an example missing here?

> So:
>
> Instead of 'SELECT $1 '.. use 'SELECT ' || TG_ARGV[0] || ..
>
> 2) Use NEW outside the quotes.
>
> So:
> 'FROM ' NEW.*

That doesn't seem to work?

CREATE OR REPLACE FUNCTION validate_arrays_sum_equals_total() RETURNS TRIGGER AS $$
DECLARE
total bigint;
array_sum bigint;
BEGIN
EXECUTE 'SELECT $1 FROM ' NEW.* INTO total USING TG_ARGV[0];
RAISE EXCEPTION 'Total: %, social_impressions: %', total, NEW.social_impressions;
RETURN NEW;
END
$$ LANGUAGE plpgsql;

psql:db/functions.sql:117: ERROR: syntax error at or near "."
LINE 6: EXECUTE 'SELECT $1 FROM ' NEW.* INTO total USING TG_ARGV[0...
^
Thanks,
François