NHibernate Criteria - nhibernate

Question

public class A
{
public string aname {get; set;}
public string aId {get; set;}
public string bId {get; set;}
}
public class B
{
public string bId {get; set;}
public string bname {get; set;}
public string cId {get; set;}
}
public class C
{
public string cId {get; set;}
public string cfirstname {get; set;}
public string clastname {get; set;}
}
public class abcDTO
{
public string aname {get; set;}
public string bname {get; set;}
public string clastname {get; set;}
}
Evetually the query which I am looking is
SELECT a.aid, b.bname, c.clastname FROM A thisa
inner join B thisb on thisa.bid=thisb.bid
inner join C thisc on thisb.cid=thisc.cid and this_.POLICY_SEARCH_NBR like '%-996654%'
The criteria which I am trying is, Please let me know the best possible way to write a criteria so that I can get the abcdto object as result
var policyInsuranceBusiness = DetachedCriteria.For<A>()
.SetProjection(Projections.Property("a.aid"))
.Add(Restrictions.Like("a.aid", "1-SAP-3-996654", MatchMode.Anywhere))
.CreateCriteria("b.bid", "b", JoinType.InnerJoin)
.SetProjection(Projections.Property("b.bname")) // ERROR OUT - COULD NOT RESOLVE PROPERTY
.CreateCriteria("c.cid", "c", JoinType.InnerJoin)
.SetProjection(Projections.Property("c.clastname")); // ERROR - COULD NOT RESOLVE PROPERTY
IList<abcDTO> plo = policyInsuranceBusiness.GetExecutableCriteria(_session).SetResultTransformer(NHibernate.Transform.Transformers
.AliasToBean<abcDTO).List<abcDTO>();

Answer 1

You can't join objects in NHibernate without having a relationship between them defined in the classes and in the mappings.
So taking your example I would estimate the following class definitions:
public class A {
public virtual string Name {get; set;}
public virtual string PolicySearchNumber {get; set;}
public virtual int Id {get; set;}
public virtual B B {get; set;}
}
public class B {
public virtual int Id {get; set;}
public virtual string Name {get; set;}
public virtual C C {get; set;}
}
public class C {
public virtual int Id {get; set;}
public virtual string Firstname {get; set;}
public virtual string Lastname {get; set;}
}
public class abcDTO {
public string int aid {get; set;}
public string aname {get; set;}
public string bname {get; set;}
public string clastname {get; set;}
}
And your Criteria Query would be:
var results = session.CreateCriteria<A>()
.CreateCriteria("B", "b")
.CreateCriteria("b.C", "c")
.SetProjection(Projections.ProjectionList()
.Add(Projections.Property("Id"), "aid")
.Add(Projections.Property("Name"), "aname")
.Add(Projections.Property("b.Name"), "bname")
.Add(Projections.Property("c.Lastname"), "clastname")
)
.SetResultTransformer(new AliasToBeanResultTransformer(typeof(abcDTO)))
.List<abcDTO>();
You can optionally choose Inner or Left Joins depending on how you handle null references in the Criteria Query.