Here's a PL/pgsql implementation I wrote.....I'm sure critics will be
able to improve upon it:
CREATE or REPLACE FUNCTION "common"."newid"()
RETURNS "pg_catalog"."varchar" AS
$BODY$
DECLARE
v_seed_value varchar(32);
BEGIN
select
md5(
inet_client_addr()::varchar ||
timeofday() ||
inet_server_addr()::varchar ||
to_hex(inet_client_port())
)
into v_seed_value;
return (substr(v_seed_value,1,8) || '-' ||
substr(v_seed_value,9,4) || '-' ||
substr(v_seed_value,13,4) || '-' ||
substr(v_seed_value,17,4) || '-' ||
substr(v_seed_value,21,12));
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE SECURITY DEFINER;
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