Conexão com multiplos bancos

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Henrique Palato

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Sep 17, 2014, 7:59:41 PM9/17/14
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Olá Amigos,

Eu tenho uma aplicação que fica em um site único e na hora do usuário fazer o login ele escolhe o banco que deseja trabalhar ou que ele tenha acesso.

Gostaria de saber se alguém já fez ou tem algum modelo para me passar.


Segue o meu arquivo de configuração do NHibernate


using System.Data;
using System.Runtime.Remoting.Messaging;
using System.Web;
using NHibernate;
using NHibernate.Cache;
using NHibernate.Cfg;

namespace Data.NhibernateBase
{
    public sealed class NHibernateSessionManager
    {
        #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>
        static NHibernateSessionManager instance;
        static readonly object padlock = new object();

        public static NHibernateSessionManager Instance
        {
            get
            {
                lock (padlock)
                {
                    //Alteramos aqui Henrique e Elton
                    return instance ?? (instance = new NHibernateSessionManager());
                    //return instance = new NHibernateSessionManager();
                }
            }
        }

        private NHibernateSessionManager()
        {
            InitSessionFactory();
        }

        #endregion

        private void InitSessionFactory()
        {
            var cfg = new Configuration();
            if (MappingByCodeConfiguration.Configured)
            {
                cfg.AddMapping(MappingByCodeConfiguration.GetCompiledMapping());
            }
            cfg.DataBaseIntegration(x => x.ConnectionStringName = DataContext.ConnectionStringName);
            sessionFactory = cfg.Configure().BuildSessionFactory();
        }

        /// <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 RegisterInterceptor(IInterceptor interceptor)
        {
            ISession session = ThreadSession;
            if (session != null && session.IsOpen)
            {
                throw new CacheException("You cannot register an interceptor once a session has already been opened");
            }
            GetSession(interceptor);
        }

        public ISession GetSession()
        {
            return GetSession(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 GetSession(IInterceptor interceptor)
        {
            ISession session = ThreadSession;
            if (session == null)
            {
                session = interceptor != null ? sessionFactory.OpenSession(interceptor) : sessionFactory.OpenSession();
                //session = sessionFactory.OpenSession();
                ThreadSession = session;
            }
            session.FlushMode = FlushMode.Auto;
            return session;
        }

        public ISession NewSession()
        {
            return sessionFactory.OpenSession();
        }

        public ISession NewSession(IDbConnection conn)
        {
            return sessionFactory.OpenSession(conn);
        }

        public void CloseSession()
        {
            ISession session = ThreadSession;
            ThreadSession = null;
            if (session != null && session.IsOpen)
            {
                session.Close();
            }
        }

        private ISession ThreadSession
        {
            get
            {
                if (HttpContext.Current != null)
                {
                    return (ISession)HttpContext.Current.Items[SESSION_KEY];
                }
                return (ISession)CallContext.GetData(SESSION_KEY);
            }
            set
            {
                if (HttpContext.Current != null)
                {
                    HttpContext.Current.Items[SESSION_KEY] = value;
                }
                else CallContext.SetData(SESSION_KEY, value);
            }
        }

        private ISessionFactory sessionFactory;
        private const string SESSION_KEY = "THREAD_SESSION";

        ~NHibernateSessionManager()
        {
            CloseSession();
        }
    }
}
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