Question

我有一个db模式：

产品

ID
ProductName
说明
StoreBrand

ProductVariation

VariationID
的ProductID
尺寸
挪威Storebrand
价格

可以预见，类看起来有点像这样：

public class Product
{
  public virtual int ID { get; set; }
  public virtual string ProductName { get; set; }
  public virtual string Description { get; set; }
  public virtual string StoreBrand { get; set; }

  public virtual IEnumerable<ProductVariation> Variations { get; set; }
}

public class ProductVariation
{
  public virtual int VariationID { get; set; }
  public virtual int ProductID { get; set; }

  public virtual Product Product {get; set;}      

  public virtual string Size { get; set; }
  public virtual double Price { get; set; }
}

我有这样的映射类：

public class ProductMapper : ClassMap<Product>
{
  public ProductMapper()
  {
    Id(x => x.ID);
    Map(x => x.ProductName);
    Map(x => x.Description);
    Map(x => x.StoreBrand);

    HasMany(x => x.Variations)
      .KeyColumn("ProductID");
  }
}

public class ProductVariationMapper : ClassMap<ProductVariation>
{
  public ProductVariation()
  {
    Id(x => x.ID);
    Map(x => x.ProductID);
    Map(x => x.Size);
    Map(x => x.Price);

    References(x => x.Product)
      .Column("ProductID");
  }
}

有点工作......

但是，我需要做的是将Product.Brands与ProductVariation.Brands绑在一起......（反之亦然）

所以查询产品，返回该品牌的ProductVariations列表...... （注意，ProductVariation在类中没有属性，但它有用于映射的列）

ProductVariation.ID不是唯一的。关键是ProductVariation.ID和ProductVariation.Brand（在数据库上）

Answer 1

public class Product
{
    public virtual int ID { get; set; }
    public virtual string StoreBrand { get; set; }

    public virtual string ProductName { get; set; }
    public virtual string Description { get; set; }

    public virtual IEnumerable<ProductVariation> Variations { get; set; }

    public override Equals(object obj)
    {
        return Equals(obj as Product)
    }

    public override Equals(Product other)
    {
        return (other != null) && (Id == other.Id) && (StoreBrand == other.StoreBrand);
    }

    public override GetHashCode()
    {
        unchecked
        {
            return Id.GetHashCode() * 397 + StoreBrand.GetHashCode();
        }
    }
}

public class ProductVariation
{
    public virtual int ID { get; set; }

    public virtual Product Product {get; set;}      

    public virtual string Size { get; set; }
    public virtual double Price { get; set; }
}

public class ProductMapper : ClassMap<Product>
{
    public ProductMapper()
    {
        // Id alone is not unique, hence compositeId
        CompositeId()
            .KeyProperty(x => x.ID)
            .KeyProperty(x => x.StoreBrand);

        Map(x => x.ProductName);
        Map(x => x.Description);

        HasMany(x => x.Variations)
            .KeyColumn("ProductID", "StoreBrand");
    }
}

public class ProductVariationMapper : ClassMap<ProductVariation>
{
    public ProductVariation()
    {
        Id(x => x.ID);

        Map(x => x.Size);
        Map(x => x.Price);

        References(x => x.Product)
            .Column("ProductID", "StoreBrand");
    }
}

流畅的NHibernate - 使用2列映射一对多

1 个答案: