Question

我是新来的,我希望有数据库的浏览量。下面是我的法典。

SearchTemplate template = new SearchTemplate();
            template.Criteria = DetachedCriteria.For(typeof(hotel));
            template.Criteria.Add(Restrictions.Lt("CheckOutDate", SelDate) || Restrictions.Eq("CheckOutDate", SelDate));
            template.Criteria.Add(Restrictions.Eq("Canceled", "False"));
    int count = template.Criteria.SetProjection(Projections.Count("ID"));

It gives me an error when I try to compile app that says "Cannot implicitly convert type NHibernate.Criterion.DetachedCriteria to int "

我想有一张桌椅。

Answer 1

请使用<代码>GetExecutableCriteria:

SearchTemplate template = new SearchTemplate();
        template.Criteria = DetachedCriteria.For(typeof(hotel));
        template.Criteria.Add(Restrictions.Lt("CheckOutDate", SelDate) || Restrictions.Eq("CheckOutDate", SelDate));
        template.Criteria.Add(Restrictions.Eq("Canceled", "False"));

var count = DoCount(template.Criteria, session /* your session */);

public long DoCount(DetachedCriteria criteria, ISession session)
{
     return Convert.ToInt64(criteria.GetExecutableCriteria(session)
                   .SetProjection(Projections.RowCountInt64())
                   .UniqueResult());
}

在一旁,请看NHibernate.Linq :

var result = (from h in Session.Linq<Hotel>()
             where h.CheckOutDate <= SelDate
             where h.Canceled != true
             select h).Count();

更多信息。

友情链接