Function VC (Version Control)

Function VC is a set of functions that allow you to version control your Postgres functions in the database.

Creating a function:

CopySELECT create_function_from_source(
$$
-- Note that you can just paste the function below:
CREATE OR REPLACE FUNCTION public.convert_to_uuid(input_value text)
 RETURNS uuid
AS $function$
DECLARE
  hash_hex text;
BEGIN
  -- Return null if input_value is null or an empty string
  IF input_value IS NULL OR NULLIF(input_value, '') IS NULL THEN
    RETURN NULL;
  END IF;
  hash_hex := substring(encode(digest(input_value::bytea, 'sha512'), 'hex'), 1, 36);
  RETURN (left(hash_hex, 8) || '-' || right(hash_hex, 4) || '-4' || right(hash_hex, 3) || '-a' || right(hash_hex, 3) || '-' || right(hash_hex, 12))::uuid;
END;
$function$
LANGUAGE plpgsql
IMMUTABLE
SECURITY DEFINER;
-- End of the function above
$$
);

Rolling back a function:

Copy
SELECT rollback_function('convert_to_uuid');

Storing all existing functions in the database:

CopySELECT archive.setup_function_history();