nhibernate中创建标准的问题

public class ClaimDetail
{
   public virtual int Id { get; set; }
   public virtual Claim Claim {get;set;}
   public virtual string ServiceDateFrom { get; set; }      
   public virtual string DateCreated { get; set; }
   public virtual ClaimDetail ParentClaimDetail { get; set; }
}

SELECT cd.ClaimDetailId ,
cd.ParentClaimDetail_id  ,
cds.ClaimDetailId  ,
cds.ParentClaimDetail_id  ,
cds.DateCreated,
cd.DateCreated
 FROM ClaimDetail AS cd left JOIN ClaimDetail AS cds ON 
cd.ClaimDetailId = cds.ParentClaimDetail_id

我在nhibernate中实现了这个查询

ICriteria query = session.CreateCriteria(typeof(ClaimDetail), "cd") 
    .CreateAlias("ParentClaimDetail", "cds", NHibernate.SqlCommand.JoinType.LeftOuterJoin);
query.SetProjection
              (
                     Projections.ProjectionList()
                       .Add(Projections.Property("cd.ParentClaimDetail.Id"), "sks")
                       .Add(Projections.Property("cd.Id"),"cdid")
                       .Add(Projections.Property("cds.DateCreated"), "dc1")
                       .Add(Projections.Property("cd.DateCreated"), "dc2")
                       .Add(Projections.Property("cds.ParentClaimDetail.Id"), "cds")
                       .Add(Projections.Property("cds.Id"),"cdsid")
              );

SELECT cd.ClaimDetailId ,
cd.ParentClaimDetail_id  ,
cds.ClaimDetailId  ,
cds.ParentClaimDetail_id  ,
cds.DateCreated,
cd.DateCreated
 FROM ClaimDetail AS cd left JOIN ClaimDetail AS cds ON 
cd.ParentClaimDetail_id = cds.ClaimDetailId