TPT需要显式模型构建器声明 [英] TPT needs explicit model builder declaration

问题描述

最好完全摆脱modelBuilder中TPT类的声明，并根据它们的命名自动化它们。

  ;     public    abstract    class    Property  
     {
      ;     public    int   PropertyID 
          {
            的 get ; 
              set  ;        } 
    } 

      public    class   构建 ：   财产 
     {
         ;  public    string   BuildingName 
          {
            的获得 ;              set ; 
  ;       } 
    } 

      public    class   众议院 ：  财产 
   & nbsp; {
          public   串  HouseAddress 
         {
        &NBSP ;   的获得; 
           &NBSP ;  set ; 
        } 
          
    } 
 

我需要指定以下的modelBuilder声明

<预风格= "font-family：索拉">&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; modelBuilder.Entity<的属性>（）ToTable（的"属性" ）;
&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; modelBuilder.Entity& lt; House >（）。ToTable（" House" ）;
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; modelBuilder.Entity<的建筑>（）ToTable。 （" Building" ）;

或者它会给我错误

无效的列名'BuildingName'。

无效的列名'HouseAddress'。

无效的列名'Discriminator'。

在最终版本中修复此问题会很好。

 

---

NeoTech

解决方案

您好，

我假设您要映射到现有数据库？

Code First默认为TPH而不是TPT，因此它需要一个Properties表，每个属性都有一列，另一列用作鉴别器。我们默认使用TPH，因为它提供了三种映射策略（TPH，TPT和TPC）中功能和
性能的最佳组合。

~Rowan

It would be good to get rid of declaration of TPT classes from modelBuilder completely and automap them based on their naming.

    public abstract class Property
    {
        public int PropertyID
        {
            get;
            set;
        }
    }

    public class Building : Property
    {
        public string BuildingName
        {
            get;
            set;
        }
    }

    public class House : Property
    {
        public string HouseAddress
        {
            get;
            set;
        }
        
    }

I need to specify the below modelBuilder declaration

            modelBuilder.Entity<Property>().ToTable("Property");
            modelBuilder.Entity<House>().ToTable("House");
            modelBuilder.Entity<Building>().ToTable("Building");

or it would give me error

Invalid column name 'BuildingName'.
Invalid column name 'HouseAddress'.
Invalid column name 'Discriminator'.

It would be good to get this fixed in the final release.

 

---

NeoTech

解决方案

Hi,

I assume you are mapping to an existing database?

Code First actually defaults to TPH rather than TPT, so it expects a single Properties table with a column for each property and an additional column to use as a discriminator. We default to TPH because it offers the best combination of functionality and performance out of the the three mapping strategies (TPH, TPT & TPC).

~Rowan

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