NHibernate的3.2許多被程序代碼

Question

許多映射我想學習NHibernate 3.2 built-in mapping by code api（不 FluentNHibernate，也不是XML）。你能幫我繪製這些實體之間的多對多關係嗎？

public class Post { 
    public virtual Id { get; set; } 
    public IList<Tag> Tags { get; set; } 
} 

public class Tag { 
    public virtual Id { get; set; } 
    public IList<Post> Posts { get; set; } 
} 

我的主鍵的策略是：

Id( 
    t => t.Id, 
    t => { 
     t.Generator(Generators.HighLow, g => g.Params(new { max_low = 100 })); 
     t.Column(typeof(TEntity).Name + "Id"); 
    }); 

，我試試這個：

// TagMap : ClassMapping<Tag> 
Bag(t => t.Posts, bag => { 
    bag.Inverse(true); 
    bag.Table("TagsPosts"); 
    bag.Cascade(Cascade.DeleteOrphans); 
}, t => t.ManyToMany(c => { 
    c.Column("PostId"); 
    c.Lazy(LazyRelation.Proxy); 
})); 

// PostMap : ClassMapping<Post> 
Bag(t => t.Tags, bag => { 
    bag.Table("TagsPosts"); 
    bag.Cascade(Cascade.DeleteOrphans); 
}, t => t.ManyToMany(c => { 
    c.Column("TagId"); 
    c.Lazy(LazyRelation.Proxy); 
})); 

，但它不工作。

Answer 1

// Post Map 
Bag(x => x.Tags, collectionMapping => 
       { 
        collectionMapping.Table("TagPosts"); 
        collectionMapping.Cascade(Cascade.None); 
        collectionMapping.Key(k => k.Column("PostID")); 
       }, 
        map => map.ManyToMany(p => p.Column("TagID"))); 

// Tag Map 
Bag(x => x.Posts, collectionMapping => 
             { 
              collectionMapping.Table("TagPosts"); 
              collectionMapping.Cascade(Cascade.None); 
              collectionMapping.Key(k => k.Column("TagID")); 
             }, 
       map => map.ManyToMany(p => p.Column("PostID"))); 

Answer 2

我認爲你需要設置的關鍵在於告訴的許多一對多表需要檢查的東西NHibernate的其中一列，例如：

// TagMap 
bag.Key(k => k.Column("TagId")); 

// PostMap 
bag.Key(k => k.Column("PostId"));