nhibernate joinqueryover无关表（相同的外键）

Question

基本上我想要做的就是在外键上连接两个表。我有这个疑问：

 var result = 
      _session.QueryOver(() => contentReferenceAlias) 
        .Inner.JoinAlias(() => contentReferenceAlias.ContentReference,() => contentLibrarySearchAlias.ContentReference) 
        .Where(() => contentReferenceAlias.ToLanguage.Id == languageId && contentReferenceAlias.ContentReference.Id == contentLibrarySearchAlias.ContentReference.Id) 
        .SelectList(list => list 
              .Select(() => contentReferenceAlias.ContentReference) 
              .Select(() => contentLibrarySearchAlias.ContentReference) 
              .Select(() => contentReferenceAlias.ContentReference.Id).WithAlias(() => resultAlias.ContentReferenceId) 
              .Select(() => contentReferenceAlias.ContentReference.Id).WithAlias(() => resultAlias.ContentReferenceId) 
              .Select(() => contentReferenceAlias.OrderedFrom).WithAlia 

的SQL IM试图重建：

SELECT A.OrderedFrom, C.LastOrdered, A.ContentReferenceId, B.Title FROM TranslationContentReference A 
    INNER JOIN TranslationOrder C ON (A.TranslationOrderId = C.Id) 
    INNER JOIN ContentLibrarySearch B ON (A.ContentReferenceId = b.ContentReferenceId) 
    WHERE A.ToLanguageId = 'xxxx-xxxx-xxxx-xxxx-xxxx' 

Answer 1

如果我理解正确的情况下，加入了人在这方面的中间人（外键参考）不能通过QueryOver API实现。 NHibernate需要知道一路下来，所以如果没有从TranslationContentReference到ContentReference到ContentLibrarySearch的明确映射，那么我们不能创建正确的JoinAliases。

所以，第一个选项是将人在这方面的中间人对象

public class ContentReference 
{ 
    ... 
    public virtual IList<TranslationContentReference> TranslationContentReference { get; set;} 
    public virtual IList<ContentLibrarySearch> ContentLibrarySearch { get; set;} 
} 

然后我们就可以导航（创建pathes）

• 从TranslationContentReference从ContentReference延伸到ContentReference
• 到ContentLibrarySearch

第二个选项，这是少NHibernate和更多的SQL，是创造ISQLQuery

ISQLQuery query = session.CreateSQLQuery(
    "SELECT A.OrderedFrom, C.LastOrdered, A.ContentReferenceId, B.Title 
    FROM TranslationContentReference A 
    INNER JOIN TranslationOrder C ON (A.TranslationOrderId = C.Id) 
    INNER JOIN ContentLibrarySearch B ON (A.ContentReferenceId = b.ContentReferenceId) 
    WHERE A.ToLanguageId = :language"); 
query.SetString("language", "xxxx-xxxx-xxxx-xxxx-xxxx"); 
var result = query.SetResultTransformer(new AliasToBeanResultTransformer(typeof(MyDTO))) 
.List();