部分加载 POCO
我有一个包含这些列的表
Id as integer
Name as string
Image as byte()
，然后我制作了两个 POCO
Public Class TableBase
Id as Integer
Name as String
End Class
Public Class Table
Inherts TableBase
Image as byte()
End Class.
因为我并不总是需要加载图像。 问题是我收到了一个歧视错误，并且 TPH 的解决方案无法解决它。因为我无法向数据库表添加区分列。
...
modelBuilder.Entity<Table>()
.Map(mc => mc.Requires("TableType").HasValue("Base"))
...
事实上我没有等级问题；我只需要部分加载 POCO
问候！
I have a Table with these columns
Id as integer
Name as string
Image as byte()
then I made two POCO
Public Class TableBase
Id as Integer
Name as String
End Class
Public Class Table
Inherts TableBase
Image as byte()
End Class.
Because I not always I need to load the image.
The problem is that I received a discrimination error, and the solutions of TPH stuff don’t resolve it. Because I can’t add a discrimination column to database table.
...
modelBuilder.Entity<Table>()
.Map(mc => mc.Requires("TableType").HasValue("Base"))
...
Actually I don’t have a hierarchy problem; I just need to load POCO partially
Regards!
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评论（1）
您不需要 TPH，因为在数据库中的 TPH 记录只能由一种实体类型表示 - 这意味着它将是
TableBase或Table，但绝不会两者兼而有之。您需要表格拆分。
You don't need TPH because in TPH record in the database can be represented by only one entity type - that means it will be either
TableBaseorTablebut never both.You need table splitting.