Can we use dblink for insert and update of dynamic values

CREATE OR REPLACE FUNCTION dblink_test()

  RETURNS boolean AS

$BODY$

DECLARE

v1 numeric;

v2 character varying(50);

BEGIN

 v1 := 123;  v2 := 'asdasdasd';

 select dblink_exec('dbname=testing_db_link_1'::text, 'insert into abc values(v1,v2);'::text);

 select dblink_exec('dbname=testing_db_link_1'::text, 'update abc set b = '' testing '' where a = v1;'::text);

RETURN FALSE;

END;

$BODY$

  LANGUAGE plpgsql STABLE

  COST 100;

ERROR: column "v1" does not exist

SQL state: 42703

Context: Error occurred on dblink connection named "unnamed": could not execute command.

SQL statement "select dblink_exec('dbname=testing_db_link_1'::text, 'insert into abc values(v1,v2);'::text)"

PL/pgSQL function "aaa" line 9 at SQL statement