将属性分组到 classes 并将它们映射到与 Entity Framework Core 中的根 class 相同的 table

Question

我有一个拥有数百个属性的实体。虽然它在数据库中很好，但在 classes 中却很不方便。问题是，如何将 class 的一些属性分组到其他 classes 中，这样在编程时会更方便，同时只保留一个 table.

伪代码示例：

class Work {
 WorkVolumes WorkVolumes;
 ...
 SomeOtherGroupOfProperties SomeOtherGroup;
}

class WorkVolumes {
 float VolumeOfWorkType1;
 float VolumeOfWorkType2;
 ...
 float VolumeEtc;
}

class SomeOtherGroupOfProperties {
 int SomeOtherProperty;
 ...
}

虽然在数据库中只有 table Work with columns VolumeOfWorkType1, VolumeOfWorkType2, VolumeEtc, SomeOtherProperty, ...

Answer 1

请在此处查看 "Automatic table splitting for owned entity types"： https://blogs.msdn.microsoft.com/dotnet/2017/06/28/announcing-ef-core-2-0-preview-2/

for the following model only one table is created:

modelBuilder.Entity<Order>().OwnsOne(
    p => p.OrderDetails,
    cb =>
    {
        cb.OwnsOne(c => c.BillingAddress);
        cb.OwnsOne(c => c.ShippingAddress);
    });

public class Order
{
    public int Id { get; set; }
    public OrderDetails OrderDetails { get; set; }
}

public class OrderDetails
{
    public StreetAddress BillingAddress { get; set; }
    public StreetAddress ShippingAddress { get; set; }
}

public class StreetAddress
{
    public string Street { get; set; }
    public string City { get; set; }
}

将属性分组到 classes 并将它们映射到与 Entity Framework Core 中的根 class 相同的 table

Group properties into classes and map them to the same table as root class in Entity Framework Core

c#

entity-framework

asp.net-core

entity-framework-core

ef-core-2.0