在數據庫中沒有正確保存的對象

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) 
     { 
     } 
    } 

我有上面的測試用例，它在這一行失敗：Assert.AreEqual(3, artist.Songs.Count);。歌曲似乎沒有得到保存。我使用自動映射，並在映射覆蓋的集合字段中使用Cascade.All()並關閉延遲。我不明白爲什麼這個測試失敗。正如你所看到的，我手動保存了3首歌曲，儘管據我所知，當Cascade.All()爲Artist.Songs字段時，我不需要這樣做。有人能告訴我我做錯了什麼嗎？謝謝。

MS SQLServer的2005，.NET 3.5，FluentNHibernate 1.2.0.712

Answer 1

你沒有使用一個事務，你永遠不會刷新會話。

你所得到的插入的唯一原因是因爲你使用的是identity發生器，當你調用Save（這是一個限制，而不是功能）的插入。

正確的方法，以這樣的：

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(); 
}