Question

如何修改以下查询以在没有LINQ的情况下进行分组？

public class Entity
{
    public long Time { get; set; }
}

public IEnumerable<Entity> Query(long interval)
{
    using (var session = m_sessionManager.OpenSession())
    {
        return session.QueryOver<Entity>()
            .Where( /* complex query */ )
            .List()
            .GroupBy(e => e.Time / interval)
            .Select(e => e.First());
    }
}

Answer 1

很难理解你想从查询中得到什么，如果你发布要在QueryOver<> API中编写的sql查询会更好。但我希望这会对你有所帮助：

return session.QueryOver<Entity>()
            .Where( /* your complex query */)
            .SelectList(list => list
                .SelectGroup(e => e.Time / interval)
                .SelectSum(e => e.whatever))
                .List</*what do you want to select a list of what*/>()
                .Select( e=> e.First ) //what is First and why it is with() is it a property??
                .ToList<...>();

QueryOver<> API

可以做很多事情

使用NHibernate QueryOver按间隔分组

1 个答案: