无法使用 Hibernate Criteria 获取 OneToMany 关系

Question

我正在尝试从数据库中获取 5 个属性。我能够获得 OneToMany 关系的所有 4 个例外。

Dua.class

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(name = "DUA_DATA_FIL_ID")
@LazyCollection(LazyCollectionOption.TRUE)
@Fetch(FetchMode.SELECT)
private List<DuaDataFileYearVO> duaDataFileYearList = new ArrayList<DuaDataFileYearVO>();

Hibernate 标准

    public DuaDataFileShipListObj getDuaInfoForShipping(String duaNumber, DisseminatorListObj disseminatorCodeListObj,
        int index) {

        DuaDataFileShipListObj dataFileShipList = null;
        List<DuaDataFileShipVO> dataFileShipVO = new ArrayList<DuaDataFileShipVO>();
        List<DuaDataFileVO> dataFileVOs = new ArrayList<DuaDataFileVO>();
        Session session = null;
        try {
            session = getSessionFactory().openSession();

            Criteria criteria = session.createCriteria(DuaDataFileVO.class, "dataFile");
            criteria.add(Restrictions.eq("duaNum", duaNumber))
            // .add(Restrictions.eq("duaDataFileYearList.duaDataFileId", 677L))
                    .add(Restrictions.in("dataDisseminatorCode", disseminatorCodeListObj.getDisseminatorCodes()));

            criteria.createAlias("dataFile.refDataFileExtractingPCTVO", "refDataFileExtractingPCTVO")
                    .createAlias("dataFile.refDataFileVO", "refDataFileVO")
                    .createAlias("dataFile.duaDataFileYearList", "duaDataFileYearList").list();

            criteria.setProjection(Projections.projectionList()
                    .add(Projections.property("duaDataFileId"), "duaDataFileId")
                    .add(Projections.property("dataDisseminatorCode"), "dataDisseminatorCode")
                    .add(Projections.property("refDataFileExtractingPCTVO"), "refDataFileExtractingPCTVO")
                    .add(Projections.property("refDataFileVO"), "refDataFileVO"));
            // criteria.setFirstResult(0);
            criteria.setMaxResults(index);
            criteria.setResultTransformer(Transformers.aliasToBean(DuaDataFileVO.class));


            dataFileVOs = criteria.list();

Answer 1

乍一看你的问题，你似乎在试图获得属性: duaDataFileYearList 。在您的 projectionList 中，我没有看到属性包含在内，而其他四个包含在内。

更新： 完成此操作的另一种方法是获取所需的整个 DuaDataFileVO 对象，然后获取 DuaDataFileVO.duaDateFileYearList 属性从那里，而不是试图通过属性获取实体。

无法使用 Hibernate Criteria 获取 OneToMany 关系

Unable to fetch OneToMany relationship using Hibernate Criteria

hibernate

criteria