nhibernate joinqueryover不相关的表（相同的外键）

基本上我要做的是在外键上连接两个表。 我有这个问题：

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 

SQL即时尝试重新创建：

  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

如果我确实正确理解了您的场景，则无法通过QueryOver API实现中间人（外键引用）的连接。 NHibernate需要一直知道pathes，所以如果没有从TranslationContentReference到ContentReference到ContentLibrarySearch显式映射，那么我们就无法创建正确的JoinAliases。

因此，第一种选择是扩展中间人对象

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

然后我们可以导航（创建路径）

• 从TranslationContentReference到ContentReference
• 从ContentReference到ContentLibrarySearch

第二个选项，即较少的NHibernate和更多的SQL，是创建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();