Question

如何在nhibernate中同时连接多个数据库

Answer 1

public interface ISessionFactoryHolder
{
ISessionFactory GetSessionFactoryForEntity<TEntity>() where TEntity : IEntity;
}

public class SessionFactoryHolder : ISessionFactoryHolder
{
private IDictionary<string, int> entityDictionary;
private IDictionary<int, ISessionFactory> factoryDictionary;

public SessionFactoryHolder()
{
this.entityDictionary = new Dictionary<string, int>();
this.factoryDictionary = new Dictionary<int, ISessionFactory>();
}

#region ISessionFactoryHolder Members

public ISessionFactory GetSessionFactoryForEntity<TEntity>() where TEntity : IEntity
{
int hashCode = 0;

Asserts.Assert<MappingException>(
this.EntityInDictionary(typeof(TEntity).FullName, out hashCode) == false
, string.Format("No persister for:{0}", typeof(TEntity).FullName));

return this.factoryDictionary[hashCode];
}

#endregion

public void RegisterSessionFactory(ISessionFactory sessionFactory)
{
Asserts.IsNotNull(sessionFactory, "sessionFactory");

this.factoryDictionary[sessionFactory.GetHashCode()] = sessionFactory;

this.MapingEntityNameToSessionFactoryHashCode(sessionFactory.Statistics.EntityNames
, sessionFactory.GetHashCode());
}

private bool EntityInDictionary(string entityName, out int sessionFactoryHashCode)
{
return this.entityDictionary.TryGetValue(entityName, out sessionFactoryHashCode);
}

private void MapingEntityNameToSessionFactoryHashCode(string[] entityNames, int sessionFactoryHashCode)
{
foreach (var entityName in entityNames)
{
this.entityDictionary[entityName] = sessionFactoryHashCode;
}
}
}