NHibernate加入临时表

Question

I want to do some work in SQL, populating a temp table, and then JOIN to that temp table using an NHibernate CreateSQLQuery to get my final results. We are on version 1.2.0.4000 of NHibernate and I seem to be having problems accessing a temp table in a later query, even though I'm in the same session (I believe this means I'm in the same SQL Session/Connection as well). Below is a simplified version of my code

public void Work()
{
    SqlConnection connection = (SqlConnection)Session.Connection;

    SqlCommand command = new SqlCommand
                     {
                         CommandType = CommandType.Text,
                         CommandText = "SELECT ID = 1 INTO #TempTable",
                         Connection = connection,
                     };

    if ( Session.Transaction != null && Session.Transaction.IsActive )
    {
        Session.Transaction.Enlist( command );
    }

    command.ExecuteNonQuery();

    // Simplified example, I should have a temp table #TempTable with 1 row containing the values ID = 1

    // trying to fetch a list of Account objects where ID exists in #TempTable.
    // At this point, I get an error "Invalid object name '#TempTable'."
    IList<Account> accounts = Session.CreateSQLQuery(@"
        SELECT *
          FROM Account a
          JOIN #TempTable tt
            ON a.ID = tt.ID")
        .AddEntity("a", typeof(Account))
        .List<Account>();

    // Do some work on accounts list
}

Answer 1

sessions get connections on demand, it is not guaranteed to get the same connection back. There are two possibilities to get the same connection every time:

• using sessionFactory.OpenSession(myConnection); which ties the session to the provided connection.
• implement IConnectionProvider which does the pooling of the connections

Option 1 is definitly easier