如何使用 Fluent NHibernate 映射 CompositeId 的引用

Question

我有三个 classes Product、Stock、StockId。 Stock有一个Token和InternalCode的复合Id，这两个属性封装在一个新的classStockID中。

我的 classes 定义是：

public class Producto
{
    public virtual long Id { get; set;
    public virtual Stock Stock { get; set; }

    ... Some other (not so important ) properties ...

    public Producto()
    {
        ...
    }
}

public class Stock
{
    public virtual StockID ID { get; set; }
    public virtual Producto ProductoStock { get; set; }
    ... other properties ...
}

public class StockID
{
    public virtual string Token { get; set; }
    public virtual long CodigoInterno { get; set; }

    public override int GetHashCode()
    {
        int hash = GetType().GetHashCode();
        hash = (hash * 31) ^ CodigoInterno.GetHashCode();
        hash = (hash * 31) ^ Token.GetHashCode();

        return hash;
    }

    public override bool Equals(object obj)
    {
        var other = obj as StockID;

        if (ReferenceEquals(null, other)) return false;
        if (ReferenceEquals(this, other)) return true;

        return this.CodigoInterno == other.CodigoInterno &&
               this.Token == other.Token;
    }
}

这些是地图：

public class ProductoMap : ClassMap<Producto>
{
    public ProductoMap()
    {
        Id(x => x.Id);
        // ... Other Maps and References

        References<Stock>( p => p.Stock);
    }
}

public class StockMap : ClassMap<Stock>
{
    public StockMap()
    {
        CompositeId( stock => stock.ID)
            .KeyProperty(x => x.CodigoInterno)
            .KeyProperty(x => x.Token);

        // ... Other Maps and References
        References(x => x.ProductoStock);
    }
}

这是我得到的异常...

Foreign key (FKD33BD86ADE26BE17:Producto [Stock_id])) must have same number of columns as the referenced primary key (Stock [CodigoInterno, Token])

我该如何解决这个问题？

Answer 1

您必须将与您的 class Producto 匹配的属性映射到您的 class 库存。它应该是这样的：

public class StockMap : ClassMap<Stock>
{
    public StockMap()
    {
        CompositeId( stock => stock.ID)
            .KeyProperty(x => x.CodigoInterno)
            .KeyProperty(x => x.Token);
        // ... Other Maps and References
        //This is ok since you have (i believe) a column in
        //in your table that stores the id from Producto
        References(x => x.ProductoStock).Column("idProducto");
        //Maybe you have to put the name of the column with
        //the id of Producto in your table Stock because
        //you could use it later.

    }
}

和 ProductMap class：

public class ProductoMap : ClassMap<Producto>
{
    public ProductoMap()
    {
        Id(x => x.Id);
        // ... Other Maps and References
        //If you have the id from Stock in your Stock class
        //this will work.
        //References<Stock>( p => p.Stock);
        //If you don't have it, this will work:
        HasOne<Stock>(x => x.Stock).PropertyRef("Name of the column whit the product id in the Stock table");
    }
}

从我的角度来看，第二个选择似乎更好。不管怎样，如果你有一个遗留数据库 o 类似的东西并没有太大的区别。

如何使用 Fluent NHibernate 映射 CompositeId 的引用

How to map a reference of a CompositeId using Fluent NHibernate

c#

nhibernate

fluent-nhibernate

fluent-nhibernate-mapping