How do I select the Count(*) of an nHibernate Subquery's results

Question

I need to do the following for the purposes of paging a query in nHibernate:

Select count(*) from 
(Select e.ID,e.Name from Object as e where...)
         


        

Answer 1

Here is a draft of how I do it:

Query:

public IList GetOrders(int pageindex, int pagesize)
{
    IList results = session.CreateMultiQuery()
        .Add(session.CreateQuery("from Orders o").SetFirstResult(pageindex).SetMaxResults(pagesize))
        .Add(session.CreateQuery("select count(*) from Orders o"))
        .List();
    return results;
}

ObjectDataSource:

[DataObjectMethod(DataObjectMethodType.Select)]
public DataTable GetOrders(int startRowIndex, int maximumRows)
{
    IList result = dao.GetOrders(startRowIndex, maximumRows);
    _count = Convert.ToInt32(((IList)result[1])[0]);

    return DataTableFromIList((IList)result[0]); //Basically creates a DataTable from the IList of Orders
}