Hibernate OneToMany關系內部聯接

Question

我試圖根據OneToMany關系中子類的ID屬性簡單地過濾出結果，但是Hibernate（4.1.9.Final）正在生成左外部聯接而不是內部聯接，因此返回的結果我不知道不想。

模型：

上級：

@Entity
@Table(name = "CATEGORY")
public class Category
{
    @Id
    @Column(name = "CATEGORYID")
    private int ID;

    @Column(name = "CATEGORYNAME")
    private String name;

    @OneToMany(fetch = FetchType.EAGER)
    @JoinColumn(name = "CATEGORYID")
    @Filter(name = "TEST_RUN_ID_FILTER")
    private Collection<TestCase> testCases
...
}

兒童：

@Entity
@Table(name = "TESTCASE_NEW")
@FilterDef(name = "TEST_RUN_ID_FILTER", defaultCondition = "TESTRUNID in (:IDS)", parameters = { @ParamDef(name = "IDS", type = "int") })
public class TestCase
{
    @Id
    @Column(name = "TESTCASEID")
    private int ID;

    @Column(name = "TESTCASENAME")
    private String name;

    @Column(name = "STATUS")
    private String status;

    @Column(name = "TESTRUNID")
    private int testRunId;
...
    }

道：

public List<Category> getAllCategoriesForTestRuns(List<Integer> testRunIDs)
    {
        Session session = getSession();
        session.enableFilter("TEST_RUN_ID_FILTER")
                .setParameterList("IDS", testRunIDs);
        Query query = session.createQuery("FROM " + Category.class.getSimpleName());
        List<Category> result = query.list();
        return resul2t;
    }

如何告訴Hibernate使用內部聯接？

Answer 1

您可以嘗試以下操作：

select c from Category c inner join c.testCases tc