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我有以下域对象:NHibernate的标准API,预测和导致
public class Data
{
public virtual int ID { get; set; }
public virtual DateTime TimeStamp { get; set; }
public virtual int Value { get; set; }
public virtual Channel Channel { get; set; }
}
我使用存储库从Rhino.Commons。我需要在一段时间内为少数几个频道选择数值的总和。这些值应按通道ID排序。我用下面的查询(在库法):
var criteria = DetachedCriteria.For<LiveData>()
.Add(Restrictions.Le("TimeStamp", startDate))
.Add(Restrictions.Ge("TimeStamp", endDate))
.Add(Restrictions.InG<Channel>("Channel", channels))
.SetProjection(Projections.Sum("Value"))
.SetProjection(Projections.GroupProperty("Channel"));
long[] result = ReportAll<long>(criteria, Projections.ProjectionList(), Order.Asc("Channel"));
和我在最后一行收到错误,因为该查询返回不长号码列表。它返回这样的对象列表(它的工作原理与它):
public class ResultValue
{
public virtual Channel Channel { get; set;}
public virtual int Value { get; set; }
public ResultValue()
{
}
public ResultValue(int value, Channel channel)
{
this.Value = value;
this.Channel = channel;
}
}
这是因为我已经添加Projections.GroupProperty(“通道”)投影的标准做了分组。有没有办法从结果集中删除投影中的一个投影(Projections.GroupProperty(“Channel”))或添加没有投影的分组?