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NHibernate: "cannot open connection"

Posted on 2010-09-01
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Last Modified: 2012-05-10
On the line of code below which says FAILS HERE I get an exception.

"cannot open connection"

I assume I have a configuration problem with the hibernate.cfg.xml file but can not find the problem since the exception is being thrown by NHibernate. Any idea where to look?



  at NHibernate.Impl.SessionFactoryImpl.OpenConnection()
   at NHibernate.Impl.ConnectionManager.Connect()
   at NHibernate.Impl.ConnectionManager.GetConnection()
   at NHibernate.Impl.BatcherImpl.Prepare(IDbCommand cmd)
   at NHibernate.Impl.BatcherImpl.ExecuteReader(IDbCommand cmd)
   at NHibernate.Loader.Loader.GetResultSet(IDbCommand st, RowSelection selection, ISessionImplementor session)
   at NHibernate.Loader.Loader.DoQuery(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)
   at NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)
   at NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters)
   at NHibernate.Loader.Loader.ListIgnoreQueryCache(ISessionImplementor session, QueryParameters queryParameters)
   at NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters queryParameters, ISet querySpaces, IType[] resultTypes)
   at NHibernate.Hql.Classic.QueryTranslator.List(ISessionImplementor session, QueryParameters queryParameters)
   at NHibernate.Impl.SessionImpl.Find(String query, QueryParameters parameters, IList results)
   at NHibernate.Impl.SessionImpl.Find[T](String query, QueryParameters parameters)
   at NHibernate.Impl.QueryImpl.List[T]()
   at PizzaPilot.Server.Runtime.Impl.ServerObjectStoreImpl.GetAllDeviceRecords() in C:\Documents and Settings\Administrator\Desktop\Code\PPServer\releases\DDServer_AmericanaPhase1\PizzaPilotRuntime\PizzaPilot\Server\Runtime\Impl\ServerObjectStoreImpl.cs:line 328
   at MobileService.InitializeComponent() in c:\Documents and Settings\Administrator\Desktop\Code\PPServer\releases\DDServer_AmericanaPhase1\CentralizedMobileService\App_Code\MobileService.cs:line 43
public IList<DeviceIDRecord> GetAllDeviceRecords()
        {
            ISessionFactory factory = nhibConfig.BuildSessionFactory();
            ISession session = factory.OpenSession();

            String q = "from DeviceIDRecord as rec where rec.UID is not null";
            IQuery query = session.CreateQuery(q);
            IList<DeviceIDRecord> evtList = query.List<DeviceIDRecord>();  <<<<<< FAILS HERE

            return evtList;
        }

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Question by:newbieweb
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Accepted Solution

by:
tikusbalap earned 500 total points
ID: 33583059
Maybe it was something wrong in your hql or .hbm config.

Try change to simple query to test:

IQuery query = session.CreateQuery("from DeviceIDRecord");
IList<DeviceIDRecord> evtList = query.List<DeviceIDRecord>();

Is there any result?
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Author Comment

by:newbieweb
ID: 33583134
No, same error.  It's a connection problem.

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LVL 6

Expert Comment

by:tikusbalap
ID: 33583433
What database are you using? And let me see your connection string as well.
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Author Comment

by:newbieweb
ID: 33586995
I am using SQL Express 2005.

    <property name="connection.connection_string">Server=localhost\SQLEXPRESS;initial catalog=PPDB01;User Id=sa;Password=sqlserversapassword;</property>


Is there a way to verify this connection string is actually being use by NHibernate?
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Author Closing Comment

by:newbieweb
ID: 33601848
Thanks.
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