任何人都可以提供/引用适当的OO类型助手类来管理SessionFactory的单例，然后还可以管理Sessions吗？
答案 0 :(得分：17)
结帐Billy McCafferty's work。他的早期版本有一些限制，你需要纠正关闭和刷新的错误处理，我不确定我是否正确，但我会发布我如何修改他的东西。
Billy还在开发一个使用MVC＆amp; amp;的新框架。 nHibernate名为S #arp Architechure，我目前正在使用它，到目前为止一直很好。
无论如何，这是我修改过的代码版本。我对准确性或完整性没有任何意义，你自己承担风险。如果您使用此功能，请确保关闭会话。如果您有任何问题，请发送电子邮件[joshua] [dot] [berke]在[gmail ...你知道其余的]。
/// <summary>
/// Handles creation and management of sessions and transactions. It is a singleton because
/// building the initial session factory is very expensive. Inspiration for this class came
/// from Chapter 8 of Hibernate in Action by Bauer and King. Although it is a sealed singleton
/// you can use TypeMock (http://www.typemock.com) for more flexible testing.
/// </summary>
public sealed class NHibernateSessionManager
{
private const string DefaultConfigFile = "DefaultAppWeb.Config";
private static readonly object _syncRoot = new object();
#region Thread-safe, lazy Singleton
/// <summary>
/// This is a thread-safe, lazy singleton. See http://www.yoda.arachsys.com/csharp/singleton.html
/// for more details about its implementation.
/// </summary>
public static NHibernateSessionManager Instance
{
get
{
return Nested.NHibernateSessionManager;
}
}
/// <summary>
/// Private constructor to enforce singleton
/// </summary>
private NHibernateSessionManager() { }
/// <summary>
/// Assists with ensuring thread-safe, lazy singleton
/// </summary>
private class Nested
{
static Nested() { }
internal static readonly NHibernateSessionManager NHibernateSessionManager =
new NHibernateSessionManager();
}
#endregion
/// <summary>
/// This method attempts to find a session factory stored in <see cref="sessionFactories" />
/// via its name; if it can't be found it creates a new one and adds it the hashtable.
/// </summary>
/// <param name="sessionFactoryConfigPath">Path location of the factory config</param>
private ISessionFactory GetSessionFactoryFor(string sessionFactoryConfigPath)
{
Check.Require(!string.IsNullOrEmpty(sessionFactoryConfigPath),
"sessionFactoryConfigPath may not be null nor empty");
// Attempt to retrieve a stored SessionFactory from the hashtable.
ISessionFactory sessionFactory;// = (ISessionFactory)sessionFactories[sessionFactoryConfigPath];
// try and get a session factory if we don't find one create it
lock (_syncRoot)
{
if (!sessionFactories.TryGetValue(sessionFactoryConfigPath, out sessionFactory))
{
Configuration cfg = new Configuration();
if (sessionFactoryConfigPath != DefaultConfigFile)
{
Check.Require(File.Exists(sessionFactoryConfigPath),
"The config file at '" + sessionFactoryConfigPath + "' could not be found");
cfg.Configure(sessionFactoryConfigPath);
}
else
{
cfg.Configure();
}
// Now that we have our Configuration object, create a new SessionFactory
sessionFactory = cfg.BuildSessionFactory();
Check.Ensure(sessionFactory != null, "sessionFactory is null and was not built");
sessionFactories.Add(sessionFactoryConfigPath, sessionFactory);
}
}
return sessionFactory;
}
/// <summary>
/// Allows you to register an interceptor on a new session. This may not be called if there is already
/// an open session attached to the HttpContext. If you have an interceptor to be used, modify
/// the HttpModule to call this before calling BeginTransaction().
/// </summary>
public void RegisterInterceptorOn(string sessionFactoryConfigPath, IInterceptor interceptor)
{
ISession session = (ISession)ContextSessions[sessionFactoryConfigPath];
if (session != null && session.IsOpen)
{
throw new CacheException("You cannot register an interceptor once a session has already been opened");
}
GetSessionFrom(sessionFactoryConfigPath, interceptor);
}
public ISession GetSessionFrom(string sessionFactoryConfigPath)
{
return GetSessionFrom(sessionFactoryConfigPath, null);
}
/// <summary>
/// Gets or creates an ISession using the web / app config file.
/// </summary>
/// <returns></returns>
public ISession GetSessionFrom()
{
return GetSessionFrom(DefaultConfigFile, null);
}
/// <summary>
/// Gets a session with or without an interceptor. This method is not called directly; instead,
/// it gets invoked from other public methods.
/// </summary>
private ISession GetSessionFrom(string sessionFactoryConfigPath, IInterceptor interceptor)
{
var allSessions = ContextSessions;
ISession session = null;
if (!allSessions.TryGetValue(sessionFactoryConfigPath, out session))
{
if (interceptor != null)
{
session = GetSessionFactoryFor(sessionFactoryConfigPath).OpenSession(interceptor);
}
else
{
session = GetSessionFactoryFor(sessionFactoryConfigPath).OpenSession();
}
allSessions[sessionFactoryConfigPath] = session;
}
//session.FlushMode = FlushMode.Always;
Check.Ensure(session != null, "session was null");
return session;
}
/// <summary>
/// Flushes anything left in the session and closes the connection.
/// </summary>
public void CloseSessionOn(string sessionFactoryConfigPath)
{
ISession session;
if (ContextSessions.TryGetValue(sessionFactoryConfigPath, out session))
{
if (session.IsOpen)
{
session.Flush();
session.Close();
}
ContextSessions.Remove(sessionFactoryConfigPath);
}
}
public ITransaction BeginTransactionOn(string sessionFactoryConfigPath)
{
ITransaction transaction;
if (!ContextTransactions.TryGetValue(sessionFactoryConfigPath, out transaction))
{
transaction = GetSessionFrom(sessionFactoryConfigPath).BeginTransaction();
ContextTransactions.Add(sessionFactoryConfigPath, transaction);
}
return transaction;
}
public void CommitTransactionOn(string sessionFactoryConfigPath)
{
try
{
if (HasOpenTransactionOn(sessionFactoryConfigPath))
{
ITransaction transaction = (ITransaction)ContextTransactions[sessionFactoryConfigPath];
transaction.Commit();
ContextTransactions.Remove(sessionFactoryConfigPath);
}
}
catch (HibernateException he)
{
try
{
RollbackTransactionOn(sessionFactoryConfigPath);
}
finally
{
throw he;
}
}
}
public bool HasOpenTransactionOn(string sessionFactoryConfigPath)
{
ITransaction transaction;
if (ContextTransactions.TryGetValue(sessionFactoryConfigPath, out transaction))
{
return !transaction.WasCommitted && !transaction.WasRolledBack;
}
return false;
}
public void RollbackTransactionOn(string sessionFactoryConfigPath)
{
try
{
if (HasOpenTransactionOn(sessionFactoryConfigPath))
{
ITransaction transaction = (ITransaction)ContextTransactions[sessionFactoryConfigPath];
transaction.Rollback();
}
ContextTransactions.Remove(sessionFactoryConfigPath);
}
finally
{
ForceCloseSessionOn(sessionFactoryConfigPath);
}
}
/// <summary>
/// Since multiple databases may be in use, there may be one transaction per database
/// persisted at any one time. The easiest way to store them is via a hashtable
/// with the key being tied to session factory. If within a web context, this uses
/// <see cref="HttpContext" /> instead of the WinForms specific <see cref="CallContext" />.
/// Discussion concerning this found at http://forum.springframework.net/showthread.php?t=572
/// </summary>
private Dictionary<string, ITransaction> ContextTransactions
{
get
{
if (IsInWebContext())
{
if (HttpContext.Current.Items[TRANSACTION_KEY] == null)
HttpContext.Current.Items[TRANSACTION_KEY] = new Dictionary<string, ITransaction>();
return (Dictionary<string, ITransaction>)HttpContext.Current.Items[TRANSACTION_KEY];
}
else
{
if (CallContext.GetData(TRANSACTION_KEY) == null)
CallContext.SetData(TRANSACTION_KEY, new Dictionary<string, ITransaction>());
return (Dictionary<string, ITransaction>)CallContext.GetData(TRANSACTION_KEY);
}
}
}
/// <summary>
/// Since multiple databases may be in use, there may be one session per database
/// persisted at any one time. The easiest way to store them is via a hashtable
/// with the key being tied to session factory. If within a web context, this uses
/// <see cref="HttpContext" /> instead of the WinForms specific <see cref="CallContext" />.
/// Discussion concerning this found at http://forum.springframework.net/showthread.php?t=572
/// </summary>
private Dictionary<string, ISession> ContextSessions
{
get
{
if (IsInWebContext())
{
if (HttpContext.Current.Items[SESSION_KEY] == null)
HttpContext.Current.Items[SESSION_KEY] = new Dictionary<string, ISession>();
return (Dictionary<string, ISession>)HttpContext.Current.Items[SESSION_KEY];
}
else
{
if (CallContext.GetData(SESSION_KEY) == null)
CallContext.SetData(SESSION_KEY, new Dictionary<string, ISession>());
return (Dictionary<string, ISession>)CallContext.GetData(SESSION_KEY);
}
}
}
private bool IsInWebContext()
{
return HttpContext.Current != null;
}
private Dictionary<string, ISessionFactory> sessionFactories = new Dictionary<string, ISessionFactory>();
private const string TRANSACTION_KEY = "CONTEXT_TRANSACTIONS";
private const string SESSION_KEY = "CONTEXT_SESSIONS";
public bool HasOpenTransactionOn()
{
return HasOpenTransactionOn(DefaultConfigFile);
}
public void CommitTransactionOn()
{
CommitTransactionOn(DefaultConfigFile);
}
public void CloseSessionOn()
{
CloseSessionOn(DefaultConfigFile);
}
public void ForceCloseSessionOn()
{
ForceCloseSessionOn(DefaultConfigFile);
}
public void ForceCloseSessionOn(string sessionFactoryConfigPath)
{
ISession session;
if (ContextSessions.TryGetValue(sessionFactoryConfigPath, out session))
{
if (session.IsOpen)
{
session.Close();
}
ContextSessions.Remove(sessionFactoryConfigPath);
}
}
public void BeginTransactionOn()
{
this.BeginTransactionOn(DefaultConfigFile);
}
public void RollbackTransactionOn()
{
this.RollbackTransactionOn(DefaultConfigFile);
}
}
答案 1 :(得分：5)
过去我使用Spring.NET的NHibernate支持模块取得了很大的成功。见http://www.springframework.net/downloads/Spring.Data.NHibernate/。您应该能够使用OpenSessionInView模块并将您的DAO扩展到NHibernateSupport DAO以获得open session in view pattern的完全管理支持。
此外，虽然我从未尝试过，但即使您选择不重置Spring.NET的产品（即IoC和AOP），您也应该能够使用上述框架。
答案 2 :(得分：4)
我建议您查看Ayende的Rhino Commons库。 documentation目前有点稀疏，但是一旦你启动并运行，使用NHibernate会更容易。
答案 3 :(得分：2)
我已在此处编写了blog post，其中我使用了上下文会话处理的托管Web实现。也许这就是你要找的东西？
答案 4 :(得分：1)
当然，这是我开始使用NHibernate时使用的内容：
会话工厂
public class BaseDataAccess
{
protected ISession m_session;
public BaseDataAccess()
{
m_session=NHibernateHttpModule.CurrentSession;
}
public static ISession OpenSession()
{
Configuration config;
ISessionFactory factory;
ISession session;
config = new Configuration();
if (config==null)
{
throw new InvalidOperationException("NHibernate configuration is null.");
}
config.AddAssembly("My.Assembly.Here");
factory = config.BuildSessionFactory();
if (factory==null)
{
throw new InvalidOperationException("Call to Configuration.BuildSessionFactory() returned null.");
}
session = factory.OpenSession();
if (session==null)
{
throw new InvalidOperationException("Call to factory.OpenSession() returned null.");
}
return session;
}
}
如果有帮助，请告诉我。
答案 5 :(得分：1)
两个建议：
答案 6 :(得分：0)
谢谢！这很有帮助，但我正在寻找一些更强大的东西。
例如，在NH网站上引用（http://hibernate.org/363.html#A9）是Andrew Mayorov的贡献，他发布了三个文件，例如（http://nhibernate.sourceforge.net/contrib/Wiki_AndrewMayorovAspNet.zip）。
事情是它没有太多帮助。我不确定如何正确使用它。我尝试了一些东西，但遇到了麻烦。
任何人都有使用此类似物的东西吗？
答案 7 :(得分：0)
NHibernate Burrow看起来很有希望。我刚开始使用它，到目前为止我没有任何问题。
答案 8 :(得分：0)
您可能会考虑通过利用NHibernate.Burrow（或自己实现类似模式）来减少管理NHibernate会话的DAL。
“NHibernate.Burrow是一款轻量级中间件，旨在通过提供先进的智能会话/事务管理和其他便利来支持使用NHibernate的.Net应用程序。”
如果你决定自己推出，那么本页底部有一些有用的链接：
一个有用的谷歌搜索术语是'NHibernate Session Management'和'Contextual Sessions'......
不缺少想法 - 你可以说有太多的选择，希望意见会开始围绕Burrow或类似的东西......