Question

criteriaCount.CreateAlias(AdvertisementsProperties.City.ToString(), "city")
                .CreateAlias(AdvertisementsProperties.Area.ToString(), "area")
                .Add(Restrictions.Disjunction()
                        .Add(Expression.Like("Advertisement." + AdvertisementsProperties.Name.ToString(), text, MatchMode.Anywhere))
                        .Add(Expression.Like("Advertisement." + AdvertisementsProperties.Description.ToString(), text, MatchMode.Anywhere)))
                        /*.Add(Expression.Like("city." + CitiesProperties.Name, text, MatchMode.Anywhere))
                        .Add(Expression.Like("city." + CitiesProperties.SlovenianName, text, MatchMode.Anywhere))
                        .Add(Expression.Like("area." + AreasProperties.Name, text, MatchMode.Anywhere))
                        .Add(Expression.Like("area." + AreasProperties.SlovenianName, text, MatchMode.Anywhere))
                        .Add(Expression.Like("country." + CountriesProperties.Name, text, MatchMode.Anywhere))
                        .Add(Expression.Like("country." + CountriesProperties.SlovenianName, text, MatchMode.Anywhere)))*/
                .List<Advertisements>();

CreateAlias或CreateCriteria在SQL中创建INNER JOIN。是否可以创建OUTER JOIN，因为在我的示例中，某些关系可以为null，而且我不需要一直使用内连接。

Answer 1

查看CreateCriteria方法和NHibernate.SqlCommand.JoinType.LeftOuterJoin参数。

您的映射也可以确定此行为，请查看：http://ayende.com/Blog/archive/2009/04/13/nhibernate-mapping-ltsetgt.aspx

NHibernate OUTER JOIN

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