Anonymous PL/SQL block

DECLARE
   gid NUMBER(10):=5850802;
   title varchar2(80);
BEGIN
   IF gid is null THEN
      DBMS_OUTPUT.PUT_LINE('GID is null');
   ELSE
      select t.g_name
      into title
      from typhoon.tbl_goods_all t
      where t.g_id = gid;
      DBMS_OUTPUT.PUT_LINE(title);
   END IF;
END;