Complex query with NHibernate

Question

I have this problem: When I try to implement a comprehensive Iyende search found at: http://ayende.com/Blog/archive/2006/12/07/ComplexSearchingQueryingWithNHibernate.aspx with the object graph: Person: M: 1 Address: M: 1 Street: M: 1 Location: M: 1 Country I get the following error: NHibernate.QueryException: I cannot use subqueries by criteria without projection. I'm doing it:

public List<Person> Find() 
{ 
    DetachedCriteria query = DetachedCriteria.For<Person>(); 
    AddAddressQuery(query); 
    return personRepository.Find(query);
} 

private void AddAddressQuery(DetachedCriteria query) 
{ 
     DetachedCriteria addressQuery = null; 
     if (!String.IsNullOrEmpty(SearchParams.HouseNumer)) 
     { 
         addresaQuery = DetachedCriteria.For<Address>(); 
         addresaQuery.Add(Restrictions.Eq("HouseNumer", 
SearchParams.HouseNumer)); 
     } 
     this.AddStreetQuery(ref addressQuery); 
     if (addressQuery != null) 
     { 
         query.CreateCriteria("Address1", 
"address1").Add(Subqueries.Exists(addressQuery)); 
     } 
} 

private void AddStreetQuery(ref DetachedCriteria query) 
{ 
    DetachedCriteria streetQuery = null; 
    if (this.SearchParams.StreetId.HasValue) 
    { 
        streetQuery = DetachedCriteria.For<Street>(); 
        streetQuery .Add( Restrictions.Eq("Id", 
this.SearchParams.StreetId.Value)); 
    } 
    if (streetQuery != null) 
    { 
        query = query ?? Query.CreateCriteria("Address1"); 
        query.CreateCriteria("Street", 
"street").Add(Subqueries.Exists(streetQuery )); 
    } 
} 

What am I doing wrong? Please, help

Answer 1

- .

addressQuery, DetachedCriteria, , . , SQL, :

... EXISTS(SELECT FROM Address WHERE HouseNumber = @HouseNumber)

... SQL, select ( a.k.a).

SetProjection .