timestamp default value

Hi All,

i created a small stored procedure to test how fast is
pgsql, and how the now() as timestamp function is
working.
but i recognized something strange!!!

i created a table with the following command:
CREATE TABLE "ms_hist" (
"msh_id" int4 DEFAULT nextval('seq_ms_hist'::text)
NOT NULL,
"mod_date" timestamptz DEFAULT now() NOT NULL,
CONSTRAINT "ms_hist_pk" PRIMARY KEY ("msh_id")
) WITH OIDS;
i have a sequence as well:
CREATE SEQUENCE "seq_ms_hist" INCREMENT 1 MINVALUE 1
MAXVALUE 9223372036854775807 CACHE 1;
and here is the stored procedure:
CREATE FUNCTION "test_time1"() RETURNS "opaque" AS
'DECLARE
counter int4;
BEGIN
for counter in 1..10000 loop
insert into ms_hist default values);
end loop;
END;
' LANGUAGE 'plpgsql';

so the function is executed but all the 10000 records
mod_date value is the same.
how this can be???
please help me!!

thanks
Ivan

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