NHibernate QueryOver with MaxResult, Group By 和 Order By [英] NHibernate QueryOver with MaxResult, Group By and Order By

问题描述

我正在尝试将 SQL 查询转换为 NHibernate QueryOver 语法，但我不明白如何按计数投影进行排序.

I'm trying to convert a SQL query to NHibernate QueryOver syntax, but I don't understand how to sort by the count projection.

这是 SQL 查询的样子:

This is what the SQL Query looks like:

select top 10 v.intVoteUserID, COUNT(v.intVoteUserID)
from Group_MessageVotes v
where v.dtmVote > :date
group by v.intVoteUserID
order by COUNT(v.intVoteUserID) desc

有什么想法吗?

推荐答案

您可以简单地重复 OrderBy 子句中的投影.

You can simply repeat the projection in the OrderBy-clause.

以下查询将为您提供一个 IList，其中每个项目的第一个元素是 id，第二个元素是计数.

The following query will give you an IList<object[]> where the first element of each item is the id and the second is the count.

var result = session.QueryOver<GroupMessageVotes>()
.Select(
    Projections.Group<GroupMessageVotes>(e => e.intVoteUserID),
    Projections.Count<GroupMessageVotes>(e => e.intVoteUserID)
    )
.OrderBy(Projections.Count<GroupMessageVotes>(e => e.intVoteUserID)).Desc
.Take(10)
.List<object[]>();

这篇关于NHibernate QueryOver with MaxResult, Group By 和 Order By的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！