如何映射沒有表的父類的子類

Question

我的數據庫中有兩個表，即超類和子類的主數據。然而，在我的申請，我有

abstract public class TierSettings 
{ 
    public Guid id { get; set; } 
    public string SomeTierSetting { get; set; } 
} 

abstract public class PricingStrategy : TierSettings 
{ 
    public string StrategySetting1 { get; set; } 
    public string StrategySetting2 { get; set; } 
} 

public class FirstPricingStrategy : PricingStrategy 
{ 
    public PricingStrategyType Strategy { get { return PricingStrategyType.Strategy1; } } 
    pubic Decimal Value { get; set; } 
} 

public class SecondPricingStrategy : PricingStrategy 
{ 
    public PricingStrategyType Strategy { get { return PricingStrategyType.Strategy2; } } 
    public Decimal Value { get; set; } 
} 

我的數據庫中兩個是會從底部子裝它的數據之間的中間階級...我只是有2個表：

TierSettings(
    Id Guid Primary Key, 
    SomeTierSetting NVarChar(100) 
) 

PricingStrategies(
    Id Guid Primary Key, Foreign Key References Parent(Id), 
    StrategySetting1 NVarChar(100), 
    StrategySetting2 NVarChar(100), 
    StrategyType Int, 
    Value Float 
) 

我m有問題映射我的hbm.xml文件中的關係。如果我將各個PricingStrategy類映射爲擴展層，則我無法訪問StrategySetting屬性...但我的PricingStrategy類不直接映射到數據庫。

我需要能夠查詢這樣：

var items = from items in session.Query<TierSettings>() 
      select item; 

foreach(var item in items) 
{ 
    Console.WriteLine(item.Value); 
} 

我怎麼能據此構建我的映射文件？

Answer 1

退房「每個具體子類表」模式

Table per concrete subclass pattern