On 8/12/23 13:09, Rhys A.D. Stewart wrote:
Greetings all,
I am writing a trigger and would like to know how to dynamically
access a column from the "OLD" variable. pk_col is the column name
from the table.
I've come up with either doing this:
EXECUTE format('SELECT $1.%1$I', pk_col) INTO pk_val USING OLD;
which looks a bit excessive, or this
pk_val = to_jsonb(OLD.*)->pk_col
which looks cleaner, but then I am having to incur a little overhead
by using the to_jsonb function. Ideally, something like this would be
great:
pk_val = OLD[pk_col]
Well if want/can use plpython3u you can do just that:
https://www.postgresql.org/docs/current/plpython-trigger.html
as:
pk_val = TD["old"][pk_col]
but evidently we can't subscript ROW types.
Am I missing out on a simpler or more elegant solution?
Rhys
Peace & Love | Live Long & Prosper
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
