Jdbc获取oracle中guid主键

String sql = "BEGIN  insert into itil_task_plan (PLAN_CODE)  values (?) returning id into ?; END;";
CallableStatementps = conn.prepareCall(sql);
ps.setString(1, taskPlan.getPlanCode());

ps.registerOutParameter(2, Types.VARCHAR);
row = ps.executeUpdate();
String zhujian = ps.getString(2);

CallableStatement