How to get the list of functions in database in PostgreSQL along with its parameters?

Question

I have a database which has over 1000 functions. I want to GRANT execution permission to certain users. I can\'t do it manually, therefore I want to get a list of functions and

Answer 1

You should use pg_get_function_arguments(func_oid). Dynamic GRANT must be executed in anonymous code block or function (change my_schema and my_username to actual values):

do $$
declare
    funcdef text;
begin
    for funcdef in
        select format('%s.%s (%s)', 
            nspname, proname, pg_get_function_arguments(p.oid))
        from pg_proc p
        join pg_namespace n on pronamespace = n.oid
        where nspname = 'my_schema' 
        and not proisagg
    loop
        execute format ('GRANT EXECUTE ON FUNCTION %s TO my_username', funcdef);
    end loop;
end $$;