kvpg2=# cREATE or replace FUNCTION trigger_after_drop_schema() RETURNS event_trigger LANGUAGE plpgsql AS $$ DECLARE r RECORD; BEGIN FOR r IN SELECT * FROM pg_event_trigger_dropped_objects() LOOP IF r.object_type = 'schema' THEN execute format ('drop role IF EXISTS r_%I', r.object_name); end if; END LOOP; END; $$; CREATE FUNCTION kvpg2=# drop schema test; DROP SCHEMA kvpg2=# \du r_test List of roles Role name | Attributes -----------+------------
kaido vaikla <kaido.vaikla@gmail.com> writes: > FOR r IN SELECT * FROM pg_event_trigger_dropped_objects() > LOOP > execute format ('drop role IF EXISTS r_%I', r.object_name); > END LOOP;
> kvpg2=# drop schema test; > ERROR: null values cannot be formatted as an SQL identifier > CONTEXT: PL/pgSQL function trigger_after_drop_schema() line 7 at EXECUTE
> Question, what i do wrong?
Assume that every dropped object has a name, looks like. You would probably do well to check object_type before trying to drop the role.
