How to execute delete statement inside a function - postgresql

Question

I want clients of my application to call DELETE statements indirectly or using a function. This is what I tried:
CREATE OR REPLACE FUNCTION layer_250_delete(layer_id integer)
RETURNS bool AS
$BODY$
BEGIN
EXECUTE 'DELETE FROM layer_250_ WHERE id = $1' USING layer_id;
RETURN TRUE;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION layer_250_delete(integer)
OWNER TO postgres;
I also tried a raw query:
...
DELETE FROM layer_250_ WHERE id = 1';
RETURN TRUE;
...
However, when I call this function (variant 1 or 2) like this:
select layer_250_delete(1);
it does not delete a row from layer_250_ table. I scanned dozens of threads here at stackoverflow, but could not find anything similar to my task.
STRUCTURE
CREATE TABLE public.layer_250_
(
id integer NOT NULL DEFAULT nextval('layer_250__id_seq'::regclass),
feature_type character varying(100) NOT NULL,
feature_hash character varying(500) NOT NULL,
feature_uid character varying(100) NOT NULL,
geom geometry,
radius integer,
group_id integer,
object_id integer NOT NULL DEFAULT 0,
row_id integer NOT NULL DEFAULT 0,
action_time timestamp without time zone NOT NULL DEFAULT now(),
action_type character varying(255),
action_user_id integer,
action_user_ip character varying(255),
CONSTRAINT layer_250__pkey PRIMARY KEY (id),
CONSTRAINT layer_250__feature_uid_key UNIQUE (feature_uid),
CONSTRAINT enforce_dims_geom_layer_250_ CHECK (st_ndims(geom) = 2),
CONSTRAINT enforce_srid_geom_layer_250_ CHECK (st_srid(geom) = 3857)
)
WITH (
OIDS=FALSE
);
ALTER TABLE public.layer_250_
OWNER TO postgres;

Answer 1

Yrs, it does:
t=# create table layer_250_ (id int);
CREATE TABLE
t=# insert into layer_250_ select 1;
INSERT 0 1
t=# CREATE OR REPLACE FUNCTION layer_250_delete(layer_id integer)
t-# RETURNS bool AS
t-# $BODY$
t$# BEGIN
t$# EXECUTE 'DELETE FROM layer_250_ WHERE id = $1' USING layer_id;
t$# RETURN TRUE;
t$# END;
t$# $BODY$
t-# LANGUAGE plpgsql VOLATILE
t-# COST 100;
CREATE FUNCTION
t=# ALTER FUNCTION layer_250_delete(integer)
t-# OWNER TO postgres;
ALTER FUNCTION
t=# begin;
BEGIN
t=# select layer_250_delete(1);
layer_250_delete
------------------
t
(1 row)
t=# select * from layer_250_;
id
----
(0 rows)
t=# end;
COMMIT