Jdbc获取oracle中guid主键

上代码

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

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

zhujian就是主键，用

CallableStatement