在NHibernate中如何在View模式中实现Open Session？ [英] How implement the Open Session in View pattern in NHibernate?

问题描述

我正在使用ASP.NET MVC + NHibernate + Fluent NHibernate，并且有一个延迟加载的问题。

通过这个问题（ 如何修复NHibernate延迟加载错误没有会话或会话被关闭？ ），我发现我必须在View模式下实现Open Session，但是我不知道如何。

在我的存储库类中，我使用这样的方法

  public ImageGallery GetById（int id） {
 using（ISession session = NHibernateSessionFactory.OpenSession（））{
 return session.Get< ImageGallery>（id）; 
} 
} 
 
 public void Add（ImageGallery imageGallery）{
 using（ISession session = NHibernateSessionFactory.OpenSession（））{
 using（ITransaction transaction = session.BeginTransaction（））{
 session.Save（imageGallery）; 
 transaction.Commit（）; 
} 
} 
} 
  

这是我的会话工厂助手类：

  public class NHibernateSessionFactory {
 private static ISessionFactory _sessionFactory; 
 private static ISessionFactory SessionFactory {
 get {
 if（_sessionFactory == null）{
 _sessionFactory = Fluently.Configure（）
 .Database（MySQLConfiguration.Standard.ConnectionString （MyConnString））
 .Mappings（m => m.FluentMappings.AddFromAssemblyOf< ImageGalleryMap>（））
 .ExposeConfiguration（c => c.Properties.Add（hbm2ddl.keywords none））
 .BuildSessionFactory（）; 
} 
 return _sessionFactory; 
} 
} 
 public static ISession OpenSession（）{
 return SessionFactory.OpenSession（）; 
} 
} 
  

有人可以帮助我在View模式中实现Open Session

谢谢。

解决方案

但我不记得在哪里找到它。当您执行以下操作或类似的操作时，您将拥有所需的内容，并将一些代码重复减少到您的存储库中作为奖励。

• 使用（在全球范围内修改问题的代码）
  Application_EndRequest不触发404


• 对于Web请求中执行的每个方法，使用相同的会话和事务实例。

  public class Repository 
 {
私人只读ISession会话; 
 
 public Repository（）
 {
 session = CurrentSessionContext.CurrentSession（）; 
} 
 
 public ImageGallery GetById（int id）
 {
 return session.Get< ImageGallery>（id）; 
} 
 
 public void Add（ImageGallery imageGallery）
 {
 session.Save（imageGallery）; 
} 
} 
  

您还可以使用ioc容器管理会话，一个工作包装单元，而不是当前的会话环境。

I'm using ASP.NET MVC + NHibernate + Fluent NHibernate and having a problem with lazy loading.

Through this question (How to fix a NHibernate lazy loading error "no session or session was closed"?), I've discovered that I have to implement the Open Session in View pattern , but I don't know how.

In my repositories classes, I use methods like this

    public ImageGallery GetById(int id) {
        using(ISession session = NHibernateSessionFactory.OpenSession()) {
            return session.Get<ImageGallery>(id);
        }
    }

    public void Add(ImageGallery imageGallery) {
        using(ISession session = NHibernateSessionFactory.OpenSession()) {
            using(ITransaction transaction = session.BeginTransaction()) {
                session.Save(imageGallery);
                transaction.Commit();
            }
        }
    }

And this is my Session Factory helper class:

public class NHibernateSessionFactory {
    private static ISessionFactory _sessionFactory;
    private static ISessionFactory SessionFactory {
        get {
            if(_sessionFactory == null) {
                _sessionFactory = Fluently.Configure()
                    .Database(MySQLConfiguration.Standard.ConnectionString(MyConnString))
                    .Mappings(m => m.FluentMappings.AddFromAssemblyOf<ImageGalleryMap>())
                    .ExposeConfiguration(c => c.Properties.Add("hbm2ddl.keywords", "none"))
                    .BuildSessionFactory();
            }
            return _sessionFactory;
        }
    }
    public static ISession OpenSession() {
        return SessionFactory.OpenSession();
    }
}

Someone could help me to implements Open Session in View pattern?

Thank you.

解决方案

This is already asked before, but I don't remember where to find it. When you do the following or something similar, you have what you want and some code duplication reduce in your repositories as bonus.

• Use this (code from question modified with the answer) in global.asax: Application_EndRequest Doesn't Fire on a 404
• Use the same session and transaction instance for every method executed during a web-request.

 

public class Repository
{
  private readonly ISession session;

  public Repository()
  {
    session = CurrentSessionContext.CurrentSession();
  } 

  public ImageGallery GetById(int id) 
  {
    return session.Get<ImageGallery>(id);
  }

  public void Add(ImageGallery imageGallery)
  {
    session.Save(imageGallery);
  }
}

You can also manage the session with an ioc container and a unit of work wrapper instead of the current session context.

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