Question

好的，我有两个名为WorkPostSheet和WorkPost的实体，其中WorkPostSheet包含一组WorkPost项：

public class WorkPostSheet
{
    ...

    public virtual IEnumerable<WorkPost> WorkPosts
    {
        get;
        private set;
    }
}

在我的集成测试中，我注意到nhibernate创建了一个我无法理解的更新语句。测试：

    [Test]
    public void Commit_CreateNewWorkPostSheetWithWorkPosts_WorkPostsPersisted()
    {
        using (IUnitOfWork unitOfWork = IsolatingFactory.CreateReadOnlyUnitOfWork())
        {
            // arrange
            WorkPostSheetRepository repository = new WorkPostSheetRepository(IsolatingFactory);
            WorkItemRepository workItemRepository = new WorkItemRepository(IsolatingFactory);

            DateTime from = new DateTime(2000, 1, 1);
            DateTime to = new DateTime(2000, 2, 1);
            WorkPostSheet sheetWithWorkPosts = WorkPostSheet.Create(TestData.CreateAndCommitUser("min", "Marius", "Ingjer", IsolatingFactory), new TimePeriod(from, to));

            WorkItem workItemToPostWorkOn = WorkItem.Create(0, "A");
            workItemRepository.Commit(workItemToPostWorkOn);

            WorkPost workPost = sheetWithWorkPosts.Add(workItemToPostWorkOn, from);

            // act
            repository.Commit(sheetWithWorkPosts);
            unitOfWork.Session.Flush();
            unitOfWork.Session.Clear();

            WorkPostSheet sheetWithWorkPostsFromDb = repository.Get(sheetWithWorkPosts.Id, false);

            // assert
            CollectionAssert.Contains(sheetWithWorkPostsFromDb.WorkPosts, workPost);
        }
    }

输出：

NHibernate：INSERT INTO“User”（UserName，FirstName，LastName）VALUES（@ p0，@ p1，@ p2）; select last_insert_rowid（）; @ p0 ='min'，@ p1 ='Marius'，@ p2 ='Ingjer'

因为我正在创建一个用户（TestData.CreateAndCommitUser）

NHibernate：INSERT INTO“WorkItem”（LastChanged，Description，Id）VALUES（@ p0，@ p1，@ p2）; @ p0 = 06.01.2010 21:50:25，@ p1 ='A'，@ p2 = 0

这是因为我正在创建一个工作项

NHibernate：INSERT INTO“WorkPostSheet”（PeriodFrom，PeriodTo，userId）VALUES（@ p0，@ p1，@ p2）; select last_insert_rowid（）; @ p0 = 01.01.2000 00:00:00，@ p1 = 01.02.2000 00:00:00，@ p2 = 1

这样我就可以创建一个工作点表了

NHibernate：INSERT INTO“WorkPost”（WorkDone，workItemId，sheetId）VALUES（@ p0，@ p1，@ p2）; select last_insert_rowid（）; @ p0 = 0，@ p1 = 0，@ p2 = 1

这是在WorkPostRepository中提交的（workpost表是根实体）

NHibernate：UPDATE“WorkPost”SET sheetId = @ p0 WHERE Id = @ p1; @ p0 = 1，@ p1 = 1

现在这个我不明白。使用在第一次提交实体时分配的相同值更新外部。你能帮我理解一下吗？

NHibernate：SELECT workpostsh0_.Id为Id3_1_，workpostsh0_.PeriodFrom为PeriodFrom3_1_，workpostsh0_.PeriodTo为PeriodTo3_1_，workpostsh0_.userId为userId3_1_，user1_.Id为Id0_0_，user1_.UserName为UserName0_0_，user1_.FirstName为FirstName0_0_，user1_。 LastName as LastName0_0_ FROM“WorkPostSheet”workpostsh0_ inner join“User”user1_ on workpostsh0_.userId = user1_.Id WHERE workpostsh0_.Id=@p0; @ p0 = 1

从存储库加载

NHibernate：选择workposts0_.sheetId为sheetId2_，workposts0_.Id为Id2_，workposts0_.Id为Id2_1_，workposts0_.WorkDone为WorkDone2_1_，workposts0_.workItemId为workItemId2_1_，workposts0_.sheetId为sheetId2_1_，workitem1_.Id为Id1_0_，workitem1_。 LastChanged作为LastChan2_1_0_，workitem1_.Description as Descript3_1_0_ FROM“WorkPost”workposts0_ inner join“WorkItem”workitem1_ on workposts0_.workItemId = workitem1_.Id WHERE workposts0_.sheetId =@p0; @ p0 = 1

延迟加载

以下是映射文件：

sealed class WorkPostClassMap : ClassMap<WorkPost>
{
    public WorkPostClassMap()
    {
        Not.LazyLoad();

        Id(post => post.Id).GeneratedBy.Identity().UnsavedValue(0);
        Map(post => post.WorkDone);
        References(post => post.Item).Column("workItemId").Not.Nullable();
        References(Reveal.Property<WorkPost, WorkPostSheet>("Owner"), "sheetId").Not.Nullable();
    }
}

sealed class WorkPostSheetClassMap : ClassMap<WorkPostSheet>
{
    public WorkPostSheetClassMap()
    {
        Id(sheet => sheet.Id).GeneratedBy.Identity().UnsavedValue(0);
        Component(sheet => sheet.Period, period =>
                                             {
                                                 period.Map(p => p.From, "PeriodFrom");
                                                 period.Map(p => p.To, "PeriodTo");
                                             });
        References(sheet => sheet.Owner, "userId").Not.Nullable();
        HasMany(sheet => sheet.WorkPosts).KeyColumn("sheetId").AsBag();
    }
}

Answer 1

您是否为关联的收集方将“inverse”属性设置为“true”？

请参阅：http://ayende.com/Blog/archive/2009/01/18/nh-prof-new-feature-superfluous-ltmany-to-onegt-update.aspx

nhibernate：为什么nhibernate更新我的子实体的外键？

1 个答案: