如何加入NHibernate / Fluent？

Question

This is so simple that I bet this has to be a duplicate question.

I have Dog and Cat , which are mapped to tables:

class Dog
{
    public virtual long Id;
    public virtual long catId;
}

class Cat
{
    public virtual long Id;
    public virtual string Name;
}

What I want is to obtain every Dog with Cat's name, instead of the id:

class DogWithName
{
    public virtual long Id;
    public virtual string CatName;
}

So DogWithName should be the result of a Dog and Cat joined query. I thought about creating a mapping for DogWithName , but that means that a DogWithName table will be created in the schema.

I don't want that. I only want a dynamic query that returns every Dog with the referenced Cat's name. How should I resolve this?

Answer 1

var result = from d in Session.Query<Dogs>() select new DogWithName { Id = d.Id, CatName = d.Cat.Name }

You have to map your classes though. The mappings are what define the way the tables are joined.

I'd also change your Dog class to

public class Dog
{
    public virtual long Id { get; set; }
    public virtual Cat Cat { get; set; }
}

you then need to map the Cat as a ManyToOne relationship. You haven't provided any mappings?