I'd expect, that this is one way binding (just for reading). In this scenario you could profit from Projections. see more here 16.6. Projections
You can create some DTO Object for your grid and similar to documentation:
CatSummary summaryDto = null;
IList<CatSummary> catReport =
session.QueryOver<Cat>()
.SelectList(list => list
.SelectGroup(c => c.Name).WithAlias(() => summaryDto.Name)
.SelectAvg(c => c.Age).WithAlias(() => summaryDto.AverageAge))
.TransformUsing(Transformers.AliasToBean<CatSummary>())
.List<CatSummary>();
You should be able to do it like this (I cannot check it right now, but it should be clear)
LietadloDTO lietadloDTO = null;
dgv.DataSource = session
.QueryOver<Lietadlo>(() => f)
.JoinAlias(() => f.Spolocnostt_Id,() => t)
.JoinAlias(() => f.Typp_Id, ()=> r)
.Where(() => t.Pocetlietadiel > 2)
.And(() => r.Name == "Boeing-747")
.SelectList(list => list
.Select(f => f.Id).WithAlias(() => lietadloDTO.Id)
.Select(t => t.Name).WithAlias(() => lietadloDTO.Name)
...
)
.TransformUsing(Transformers.AliasToBean<LietadloDTO>())
.List<LietadloDTO>()
.ToList<LietadloDTO>();
So, in this case, you will force NHibernate to create Projection (only 1 SELECT clause) and return all needed data at once