实体框架 4 - 功能 CTP5 中的 TPT 继承（代码优先）：重命名继承表上的外键列

Question

我正在尝试将 xml 实体框架模型转换为 Code First (CTP5) 模型。 我必须建模一个非常适合 TPT 模式的层次结构。 我唯一的问题是“继承”表的主键/外键与基类的主键名称不同。

这些是涉及表的相关字段

CREATE TABLE site.Domains
(
    ID INT NOT NULL PRIMARY KEY,
    Domain NVARCHAR(128) NOT NULL
)

CREATE TABLE site.MainSites
(
    FKDomainID INT NOT NULL PRIMARY KEY REFERENCES site.Domains(ID)
)

CREATE TABLE site.SisterSites
(
    FKDomainID INT NOT NULL PRIMARY KEY REFERENCES site.Domains(ID)
)

这是我们在构建模型时使用的代码

var domain = modelBuilder.Entity<Domain>();

domain.HasKey(c => c.Id)
    .ToTable("Domains", "site");

domain.Property(c => c.DomainName)
    .HasColumnName("Domain")
    .HasMaxLength(128)
    .IsRequired();

domain.Ignore(c => c.OldId);

var mainSite = modelBuilder.Entity<MainSite>();

mainSite.Map(m =>
{
    m.ToTable("MainSites", "site");
});

var sisterSite = modelBuilder.Entity<SisterSite>();

sisterSite.Map(m =>
{
    m.ToTable("SisterSites", "site");
});

这是我们得到的生成的sql

SELECT 
[Limit1].[C2] AS [C1], 
[Limit1].[C1] AS [C2], 
[Limit1].[Domain] AS [Domain]
FROM ( SELECT TOP (2) 
    [UnionAll1].[Id] AS [C1], 
    [Extent3].[Domain] AS [Domain], 
    CASE WHEN ([UnionAll1].[C1] = 1) THEN ''0X0X'' ELSE ''0X1X'' END AS [C2]
    FROM   (SELECT 
        [Extent1].[Id] AS [Id], 
        cast(1 as bit) AS [C1]
        FROM [site].[MainSites] AS [Extent1]
    UNION ALL
        SELECT 
        [Extent2].[Id] AS [Id], 
        cast(0 as bit) AS [C1]
        FROM [site].[SisterSites] AS [Extent2]) AS [UnionAll1]
    INNER JOIN [site].[Domains] AS [Extent3] ON [UnionAll1].[Id] = [Extent3].[Id]
    WHERE [UnionAll1].[Id] = @p__linq__0
)  AS [Limit1]',N'@p__linq__0 int',@p__linq__0=1

如您所见，它会查找不存在的 site.MainSites.Id 和 site.SisterSites.Id。 我什至尝试过类似的东西

mainSite.Property(m => m.Id).HasColumnName("FKDomainID");

但是，你可以猜到，它没有用。

有什么建议吗？

提前致谢

Answer 1

很遗憾，这在 CTP5 中是不可能的。这是 EF 团队的confirmed。