UpdateByExampleSelective实现数据库按条件修改

场景如下：把未发货的商品发货，即，订单状态由未发货变为已发货，这里用到了updateByExampleSelective.

    @Override
    @Transactional(propagation = Propagation.REQUIRED)
    public void updateDeliverOrderStatus(String orderId) {
        OrderStatus updateOrder = new OrderStatus();
        updateOrder.setOrderStatus(OrderStatusEnum.WAIT_RECEIVE.type);
        updateOrder.setDeliverTime(new Date());
        Example example = new Example(OrderStatus.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andEqualTo("orderId", orderId);
        criteria.andEqualTo("orderStatus", OrderStatusEnum.WAIT_DELIVER.type);
        orderStatusMapper.updateByExampleSelective(updateOrder, example);
    }