Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

NHibernate: "cannot open connection"

Posted on 2010-09-01
5
1,087 Views
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;
        }

Open in new window

0
Comment
Question by:newbieweb
  • 3
  • 2
5 Comments
 
LVL 6

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?
0
 

Author Comment

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

0
 
LVL 6

Expert Comment

by:tikusbalap
ID: 33583433
What database are you using? And let me see your connection string as well.
0
 

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?
0
 

Author Closing Comment

by:newbieweb
ID: 33601848
Thanks.
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Get month and date in a format 4 32
Amazon S3 .Net error 5 18
JQuery Detecting page post back 6 11
How to repeat the data 4 18
Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

860 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question