Fluent NHibernate:奇怪的列映射行为
我在尝试使用Fluent NHibernate映射实体时遇到了一些问题 我有三个实体,如下所示:Fluent NHibernate:奇怪的列映射行为,nhibernate,mapping,fluent,Nhibernate,Mapping,Fluent,我在尝试使用Fluent NHibernate映射实体时遇到了一些问题 我有三个实体,如下所示: public class Product { public virtual Guid Id { get; set; } public virtual Category Category { get; set; } public virtual Seller Seller { get; set; } } public class Seller { public vir
public class Product
{
public virtual Guid Id { get; set; }
public virtual Category Category { get; set; }
public virtual Seller Seller { get; set; }
}
public class Seller
{
public virtual Guid Id { get; set; }
public virtual IList<Product> Products { get; set; }
}
public class Category
{
public virtual int Id { get; set; }
}
public sealed class ProductDbMap : ClassMap<Product>
{
public ProductDbMap()
{
Id(x => x.Id);
References(x => x.Seller)
.Not.Nullable();
References(x => x.Category, "Category")
.Nullable();
}
}
public sealed class SellerDbMap : ClassMap<Seller>
{
public SellerDbMap()
{
Id(x => x.Id);
HasMany(x => x.Products);
}
}
public sealed class CategoryDbMap : ClassMap<Category>
{
public CategoryDbMap()
{
Id(x => x.Id);
}
}
以下是NHibernate决定生成表的方式:
create table Product (
Id UNIQUEIDENTIFIER not null,
SellerId UNIQUEIDENTIFIER not null,
CategoryId INTEGER,
Seller_id UNIQUEIDENTIFIER,
primary key (Id)
)
create table Seller (
Id UNIQUEIDENTIFIER not null,
primary key (Id)
)
create table Category (
Id integer,
primary key (Id)
)
生成产品表时有几个错误:
发生了什么事?在这里回答我自己的问题 1) 出现重复列是因为我需要在ReferenceConvention之外添加HasManyConvention。两者一起工作将只创建列。HasManyConvention的代码是:
public class HasManyConventions : IHasManyConvention
{
public bool Accept(IOneToManyPart target)
{
return true;
}
public void Apply(IOneToManyPart target)
{
target.KeyColumnNames.Add(target.EntityType.Name + "Id");
}
}
2) 第二个问题似乎是Fluent NHibernate的约定有点奇怪。我的理解是,类映射的列名应该覆盖约定(这在逻辑上有意义,而且更有用)。然而,这似乎没有发生。通过检查约定中的列名是否为空,可以解决此问题:
public class ReferenceConventions : IReferenceConvention
{
public bool Accept(IManyToOnePart target)
{
return true;
}
public void Apply(IManyToOnePart target)
{
if (target.GetColumnName() == null)
target.ColumnName(target.Property.Name + "Id");
}
}
public class ReferenceConventions : IReferenceConvention
{
public bool Accept(IManyToOnePart target)
{
return true;
}
public void Apply(IManyToOnePart target)
{
if (target.GetColumnName() == null)
target.ColumnName(target.Property.Name + "Id");
}
}