NHibernate - CreateSQLQuery異常「沒有persister for ..」，爲什麼？

Question

我試圖創建使用createSQLQuery NHibernate的SQL查詢：

var query = session.CreateSQLQuery(
    "select loss.id as loss.Id, loss.start_date as loss.Date, " + 
    "  (select ... limit 1) as loss.Reserve, " + 
    "  (select sum(m.val) ...) as loss.Payment " + 
    "from LossData loss .. where ..."; 

// Commenting or uncommenting these doesn't have any effect either 
query.AddScalar("Id", NHibernateUtil.Int32); 
query.AddScalar("Date", NHibernateUtil.DateTime); 
query.AddScalar("Reserve", NHibernateUtil.Double); 
query.AddScalar("Payment", NHibernateUtil.Double); 

query.AddEntity("loss", typeof(LossQueryDto)); 
query.SetResultTransformer(Transformers.AliasToBean(typeof(LossQueryDto))); 

var list = query.List<LossQueryDto>(); 

但它給我一個錯誤「沒有留存爲：‘LossQueryDto’」。這個查詢有什麼問題？ 我是否需要查詢的附加映射？如果是這樣，我可以在Fluent Nhibernate中定義一個嗎？我使用NHibernate 3.1。

DTO的本身是這樣的：

public class LossQueryDto 
{ 
    public virtual int Id { get; set; } 
    public virtual DateTime Date { get; set; } 
    public virtual double Reserve { get; set; } 
    public virtual double Payment { get; set; } 
} 

謝謝！

Answer 1

您還沒有查詢實體，但DTO，這樣你就可以刪除以下內容：

query.AddEntity("loss", typeof(LossQueryDto));