Re: Problem with self-made plpgsql-function / casting

Moritz Bayer <moritz(dot)bayer(at)googlemail(dot)com> writes:
> ERROR: function public.fc_editlanguage(integer, "unknown", "unknown",
> integer) does not exist
>
> CREATE OR REPLACE FUNCTION "public"."fc_editlanguage" (id bigint, name
> varchar, kuerzel varchar, active smallint) RETURNS smallint AS

The short answer to this is to avoid declaring function arguments as
"smallint". When you call this as, say,

select fc_editlanguage(42, 'foo', 'bar', 1);

the "42" and the "1" are initially typed as integer constants. There's
an implicit up-cast from integer to bigint, so the parser has no problem
matching the 42 to a bigint parameter, but the down-cast from integer to
smallint is not implicit. With the function as written you'd have to
cast to smallint explicitly:

select fc_editlanguage(42, 'foo', 'bar', 1::smallint);

This is enough of a notational pain in the neck that it's easier just to
declare the argument as integer.

regards, tom lane