java - 非空属性引用 transient 值 transient 实例必须在当前操作之前保存

Question

我在外键 dimension_id 之一的表中有表 product。所以在服务层编写我的测试用例时它显示了错误。 这是我的测试用例

@Transactional(propagation = Propagation.REQUIRED)
    private ProductBO getProductBO() {
        SellerBO sellerBO = getSellerBO();
        ProductBO productBO = new ProductBO();
        productBO.setCategoryId(1);
        productBO.setDateAvailable("20/00/0000");
        productBO.setImage("a15cb5e");
        productBO.setLocation("for getting product details");
        productBO.setMinimum(26.00);
        productBO.setModel("service");
        productBO.setPoints(5);
        productBO.setPrice(12.2f);
        productBO.setQuantity("2");
        productBO.setSellerBO(sellerBO);
        productBO.setShipping(2);
        productBO.setSku("aqaqaq");
        productBO.setSortOrder("aes");
        productBO.setStatus(1);
        productBO.setStockStatusId("20");
        productBO.setProductName("Micromax");
        productBO.setSubtract(20.0001);
        productBO.setUpc("asd");
        productBO.setViewed(2);
        productBO.setWeight("25");
        productBO.setWeightClassBO(getWeightClassBO(productBO));
        productBO.setDimensionBO(getDimension());
        return productBO;
    }


public DimensionBO getDimension() {
        DimensionBO dimensionBO = new DimensionBO();
        dimensionBO.setHeight(12);
        dimensionBO.setLength(23);
        dimensionBO.setWidth(14);
        dimensionBO.setLengthClassBO(getLengthClass());
        try {
            manageDimensionServiceImpl.addDimension(dimensionBO);
        } catch (CrafartServiceException csExp) {
            csExp.printStackTrace();
            Assert.fail();
        }

        return dimensionBO;

    }

这是我的维度

@Override
    @Transactional(propagation = Propagation.REQUIRED)
    public void addDimension(DimensionBO dimensionBO) throws CrafartServiceException {

        DimensionDO dimensionDO = beanMapper.mapDimensionBOToDO(dimensionBO, new DimensionDO(), beanMapper.mapLengthClassBOToDO(dimensionBO.getLengthCassBO(), new LengthClassDO()));
        try {

            dimensionDAOImpl.addDimension(dimensionDO);
            dimensionBO.setDimensionId(dimensionBO.getDimensionId());
            //LengthClassDO lengthClassDO = lengthClassDAOImpl.getLengthClass(dimensionBO.getLengthCassBO().getLengthClassId());
            //dimensionDO.setLengthClassDO(lengthClassDO);
        } catch (CrafartDataException e) {
            throw new CrafartServiceException("Error while adding dimension", e);

        }

    }

这是我的维度DAOimpl

@Override
    @Transactional(propagation = Propagation.REQUIRED)
    public void addDimension(DimensionDO dimensionDO) throws CrafartDataException {
        try {
            Session session = this.getSessionFactory().getCurrentSession();
            session.persist(dimensionDO);
        } catch (HibernateException hExp) {
            throw new CrafartDataException("DB Error while adding dimension details in table", hExp);
        }
    }

}

DO 到 BO 的映射

public DimensionBO mapDimensionDOTOBO(DimensionDO dimensionDO,DimensionBO dimensionBO,LengthClassBO lengthClassBO) {
        dimensionBO.setDimensionId(dimensionBO.getDimensionId());
        dimensionBO.setHeight(dimensionBO.getHeight());
        dimensionBO.setLength(dimensionBO.getLength());
        dimensionBO.setWidth(dimensionBO.getWidth());
        dimensionBO.setLengthClassBO(lengthClassBO);
        return dimensionBO;
    }

BO 到 DO 的映射

public DimensionDO mapDimensionBOToDO(DimensionBO dimensionBO, DimensionDO dimensionDO ,LengthClassDO lengthClassDO)  {
        dimensionDO.setDimensionId(dimensionDO.getDimensionId());
        dimensionDO.setHeight(dimensionDO.getHeight());
        dimensionDO.setLength(dimensionDO.getLength());
        dimensionDO.setWidth(dimensionDO.getWidth());
        dimensionDO.setLengthClassDO(lengthClassDO);

        return dimensionDO;
    }

Answer 1

你得到的异常 Not-null property references a transient value transient instance must be saved before current operation 意味着当你持久化 dimensionDO 对象时，有引用非持久化(即 transient )对象的对象关系，因此它无法管理外键。

您的代码没有显示这种关系在哪里。也许当您从 dimensioBO 映射到 dimensionDO 时，您创建了一个您必须在之前保留的新实例。

另一方面，在 productBO 中，您有两个对新实例的引用，一个用于 sellerBO，一个用于 dimensionBO。但是您不显示产品持久性的代码...