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我需要在这种场景中创建正确流利的NH映射的帮助：功能NHibernate：多对多自引用映射
类别可以是一个或多个类别的孩子。因此，所得的此实体：
public class Category : Entity, IAggregateRoot
{
[EntitySignature]
public virtual string Name { get; set; }
public virtual IList<Category> Parents { get; set; }
public virtual IList<Category> Children { get; set; }
public virtual IList<ProductCategory> Products { get; set; }
public Category()
{
Parents = new List<Category>();
Children = new List<Category>();
Products = new List<ProductCategory>();
}
public virtual void AddCategoryAsParent(Category parent)
{
if (parent != this && !parent.Parents.Contains(this) && !Parents.Contains(parent))
{
Parents.Add(parent);
parent.AddCategoryAsChild(this);
}
}
public virtual void RemoveCategoryAsParent(Category parent)
{
if (Parents.Contains(parent))
{
Parents.Remove(parent);
parent.RemoveCategoryAsChild(this);
}
}
public virtual void AddCategoryAsChild(Category child)
{
if(child != this && !child.Children.Contains(this) && !Children.Contains(child))
{
Children.Add(child);
child.AddCategoryAsParent(this);
}
}
public virtual void RemoveCategoryAsChild(Category child)
{
if(Children.Contains(child))
{
Children.Remove(child);
child.RemoveCategoryAsParent(this);
}
}
}
我的初始映射是这样的：
public class CategoryMap : ClassMap<Category>
{
public CategoryMap()
{
Id(p => p.Id).GeneratedBy.Identity();
HasManyToMany(x => x.Parents)
.Table("CategoryParents")
.ParentKeyColumn("CategoryId")
.ChildKeyColumn("ParentCategoryId")
.Cascade.SaveUpdate()
.LazyLoad()
.AsBag();
HasManyToMany(x => x.Children)
.Table("CategoryParents")
.ParentKeyColumn("ParentCategoryId")
.ChildKeyColumn("CategoryId")
.Cascade.SaveUpdate()
.Inverse()
.LazyLoad()
.AsBag();
}
}
与这个映射的问题是每当我删除类别作为父或作为另一类别的子级，所述得到的SQL语句是这样的：
NHibernate: DELETE FROM CategoryParents WHERE CategoryId = @p0;@p0 = 2
NHibernate: INSERT INTO CategoryParents (CategoryId, ParentCategoryId) VALUES (@p0, @p1);@p0 = 2, @p1 = 3
它首先删除所有映射，然后插入剩余的映射。正确的方法是删除这类声明的类别父映射：
DELETE FROM CategoryParents WHERE CategoryId = @p0 AND ParentCategoryId = @p1;@p0 = 2, @p1=1
任何想法？
我注意到你正在使用IAggregateRoot。这是否违背了更多的父母？ – Nathan 2010-03-05 05:12:31