Hello ,
I have a query about creating nested functions in PostgreSQL.
I am currently using PostgreSQL 15 and I am trying to create a nested function with the following structure:
CREATE OR REPLACE FUNCTION external_function ()
RETURNS void AS $$
DECLARE
external_variable;
-- Define the internal function
FUNCTION internal_function ()
RETURNS void AS $$
DECLARE
internal_variable INT;
BEGIN
-- Internal function code
internal_variable:= 10;
RAISE NOTICE 'Internal Variable: %', internal_variable;
END;
$$ LANGUAGE plpgsql;
BEGIN
-- External function code
external_variable:= 5;
RAISE NOTICE 'External variable: %', external_variable;
-- Call internal function
PERFORM internal_function ();
END;
$$ LANGUAGE plpgsql;
However, I get an error, and I can't compile the function.
Thank you very much for your help
You did nested dollar quoting wrong; and I don’t see the word create where you try to define the function inside the outer function.
You are probably better off just defining two functions independently anyway, there is minimal benefit to having on function define another in PostgreSQL, there are no closures.
David J.
