Hibernate 一次查询分多次返回 避免内存溢出

    public void grpcGpioDevice(StreamObserver<NI_GetAllDeviceListResponse> responseObserver,
            Map<String, VsGrpc> vcuMap) {
        Session session = null;
        final StringBuffer sb = new StringBuffer("select name,vs_id,"
                + "description,direction,device_id,vx_external_id from EMS_GPIO_DEVICE ");
        try {
            session = getSession();
            Query query = session.createSQLQuery(sb.toString()).setFetchSize(grpcRspNumber);
            ScrollableResults results =  query.scroll();
            List<GpioDevice> gpioList = new ArrayList<>();

            while(results.next()) {
                Object[] obj = results.get();
                GpioDevice gd = new GpioDevice();
                gd.setName(obj[0] == null ?"":obj[0].toString());
                gd.setVsId(obj[1] == null ?"":obj[1].toString());
                gd.setDescription(obj[2] == null ?"":obj[2].toString());
                gd.setDirection(obj[3] == null ?0:Integer.parseInt(obj[3].toString()));
                gd.setDeviceId(obj[4] == null ?"":obj[4].toString());
                gd.setVxExternalId(obj[5] == null ?"":obj[5].toString());
                gpioList.add(gd);
                if(gpioList.size()==grpcRspNumber) {
                    NI_GetAllDeviceListResponse.Builder response = NI_GetAllDeviceListResponse.newBuilder();
                    grpcFlowResult.getAiAoDiDoInfo(null, gpioList, vcuMap, "DIDO", response);
                    grpcFlowResult.result(response, responseObserver);
                    gpioList.clear();
                }
            }
            if(gpioList.size()>0 && gpioList.size()<grpcRspNumber) {
                NI_GetAllDeviceListResponse.Builder response = NI_GetAllDeviceListResponse.newBuilder();
                grpcFlowResult.getAiAoDiDoInfo(null, gpioList, vcuMap, "DIDO", response);
                grpcFlowResult.result(response, responseObserver);
                gpioList.clear();
            }
        }catch (RuntimeException e) {
            e.printStackTrace();
          } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            releaseSession(session);
        }
    }