I have a scenario, where a trigger function is activated before an update of some sort. And in order for the condition to be met one of the columns must be excluded from the "OLD" and "NEW" objects.
CREATE FUNCTION example_function() RETURNS trigger AS
$example_function$
BEGIN
IF
(OLD <> NEW) IS TRUE THEN
//Do something here
END IF;
RETURN NEW;
END;
$example_function$
LANGUAGE plpgsql;
CREATE TRIGGER example_function
BEFORE UPDATE
ON some_table
FOR EACH ROW
EXECUTE PROCEDURE example_function();
The problem is that the table has above 50 columns and it would be quite hard to type out or maintain afterwards.
The column i want to exclude – lets say modified_date will meet the condition of being different every time, however how can it be excluded from the check completely?
(OLD <> NEW exclude modified_date ) IS TRUE THEN – something similar should happen logically
2
Answers
Perhaps you could use code like this, where
tab
is the table with the trigger:You can compare JSON representations of the records excluding selected columns: