Question

I have some problem to convert this NHibernate queries into the left join queryover

var query = session.Query<T>.Join(
    Session.Query<RecordOrder>(),
    q=>q.MiniDbName,
    o=>o.DatabaseName,
    (q,o)=>new{Record = q, Order = o.OrderValue})

Anyone can help me, I want this query support the left join.

Answer 1

The default join is an inner-join. Each of the additional join types can be specified using the methods .Inner, .Left, .Right, or .Full. For example, to left outer-join on Kittens use:

IQueryOver<Cat,Kitten> catQuery =
session.QueryOver<Cat>()
    .Left.JoinQueryOver(c => c.Kittens)
        .Where(k => k.Name == "Tiddles");

In your case :

    var list =
    session.QueryOver<RecordOrder>()
    .Left.JoinQueryOver(c => c.Orders).ToList()