SQL到LINQ转换

-2

我需要帮助生成所需的C＃代码来实现以下SQL查询。我不确定这是否可能？SQL到LINQ转换

select p.Name, r.Id, r.Status, r.Created, r.DepartmentId 
from (select r.*, row_number() over (partition by personid order by created desc) as seqnum 
     from checkin r 
     where r.departmentid = '7AF20674-AEC1-4D4C-B1EA-88B1D7E8F3DB' and cast(created as date) = '2013-02-11' 
    ) r join 
    person p 
    on r.personid = p.id 
where seqnum = 1 
order by p.name desc

之前我以前每人只有一次注册，所以以下是可能的。现在，我可以每人每天进行多次注册，这就是SQL更新的原因。

var query = from b in context.Persons 
       join c in context.CheckIns 
        on b.Id equals c.PersonId into JoinedPersCheck 
       from c in JoinedPersCheck.Where(i => i.Date.Equals(date)).DefaultIfEmpty() 
       where b.DepartmentId.Equals(departmentId) 
       orderby b.Name 

       select new Model.PersonCheckIn 
       { 
        CheckIn = MapToCheckInModel(c), 
        Person = MapToModel(b), 
       }; 
    return query;

来源

2013-02-11 Andreas

还有，你试过这么远吗？至少开始实施LINQ解决方案并尽可能地实现;至少处理简单的东西。 – Servy 2013-02-11 20:46:34

@Servy好吧，我用我之前使用的代码编辑过我的帖子。我很难适应分区和row_number（） – Andreas 2013-02-11 20:56:17

试试这个：

var query = context.CheckIns 
       .Where(p => p.DepartmentId == departmentId && p.Created.Date == date) 
       .GroupBy(r => r.PersonId) 
       .Select(g => g.OrderByDescending(p => p.Created).First()) 
       .Join(context.Persons, c => c.PersonId, p => p.Id, 
         (c,p) => new { p.Name, c.Id, c.Status, c.Created, c.DepartmentId}) 
       .OrderByDescending(f => f.Name);

来源

2013-02-11 21:14:55

SQL到LINQ转换

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