在数据库中没有正确保存的对象

Question

[Test] 
public void Artist_gets_stored_properly() 
{ 
    using (ISession session = NHHelper.GetSession()) 
    { 
     Artist artist = new Artist() { Name = "Somathilaka Jayamaha" }; 

     artist.Songs = new List<Song>() 
     { 
      new Song(){Artist = artist, Name = "Manamaala girawu"}, 
      new Song(){Artist = artist, Name = "Sende andura"}, 
      new Song(){Artist = artist, Name = "Sunilwan nuwan"} 
     }; 

     foreach (var s in artist.Songs) 
     { 
      session.Save(s); 
     } 
     session.Save(artist); 
    } 

    using (ISession session = NHHelper.GetSession()) 
    { 
     Artist artist = session.Query<Artist>().Single(x => x.Name == "Somathilaka Jayamaha"); 
     Assert.AreEqual(3, artist.Songs.Count); 
     Assert.AreEqual("Sende andura", artist.Songs[1].Name); 
    } 
} 

public class Artist 
    { 
     public virtual int Id { get; set; } 
     public virtual string Name { get; set; } 
     public virtual IList<Song> Songs { get; set; } 
    } 

    public class Song 
    { 
     public virtual int Id { get; set; } 
     public virtual string Name { get; set; } 
     public virtual string WebPath { get; set; } 
     public virtual string FilePath { get; set; } 
     public virtual bool Downloaded { get; set; } 
     public virtual Artist Artist { get; set; } 

     void Download(IDownloader downloader) 
     { 
     } 
    } 

我有上面的测试用例，它在这一行失败：Assert.AreEqual(3, artist.Songs.Count);。歌曲似乎没有得到保存。我使用自动映射，并在映射覆盖的集合字段中使用Cascade.All()并关闭延迟。我不明白为什么这个测试失败。正如你所看到的，我手动保存了3首歌曲，尽管据我所知，当Cascade.All()为Artist.Songs字段时，我不需要这样做。有人能告诉我我做错了什么吗？谢谢。

MS SQLServer的2005，.NET 3.5，FluentNHibernate 1.2.0.712

Answer 1

你没有使用一个事务，你永远不会刷新会话。

你所得到的插入的唯一原因是因为你使用的是identity发生器，当你调用Save（这是一个限制，而不是功能）的插入。

正确的方法，以这样的：

using (ISession session = NHHelper.GetSession()) 
using (var transaction = session.BeginTransaction()) 
{ 
    Artist artist = new Artist { Name = "Somathilaka Jayamaha" }; 

    artist.Songs = new List<Song>() 
    { 
     new Song{Artist = artist, Name = "Manamaala girawu"}, 
     new Song{Artist = artist, Name = "Sende andura"}, 
     new Song{Artist = artist, Name = "Sunilwan nuwan"} 
    }; 

    session.Save(artist); 
    transaction.Commit(); 
}