在linq中转换SQL查询

在linq中转换SQL查询

本文介绍了在linq中转换SQL查询的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有这个查询现在我尝试在linq中转换此查询



  ALTER   procedure  [dbo]。[spstdinfo] 
@ year_p int
as
选择 Catg_type.Catg_type,Program_type.Prog_name,Year_info.year,
COUNT(std_info.catg_id) as total_students 来自 Std_info
inner join Catg_type on Std_info.Catg_id = Catg_type.Catg_id
INNER join Program_type on Std_info.Prog_id = Program_type.Prog_id
inner join Year_info Std_info.year_id = Year_info.year_id
其中 @ year_p = Year_info.year
group by Catg_type,Program_type.Prog_name,Year_info.year





我尝试过:



i试试这个..



  var  re =( from  stdtable  in  a.Std_info 
join catg in a.Catg_type on stdtable.Catg_id equals catg.Catg_id
join prog in a.Program_type on stdtable.Prog_id等于prog.Prog_id
join yea in a.Year_info on stdtable.year_id等于yea.year_id
选择 new {Std_info = stdtable,catg_type = catg,Program_type = prog,Year_info = yea});





现在在sql查询中有计数使用现在怎么样我在linq中使用计数





我是怎么做到的

解决方案

i have this query now i try to convert this query in linq

ALTER procedure [dbo].[spstdinfo]
@year_p int
as
select Catg_type.Catg_type,Program_type.Prog_name ,Year_info.year,
COUNT(Std_info.catg_id) as total_students from Std_info
inner join Catg_type on Std_info.Catg_id=Catg_type.Catg_id
INNER join Program_type on Std_info.Prog_id=Program_type.Prog_id
inner join Year_info on Std_info.year_id=Year_info.year_id
where @year_p=Year_info.year
group by Catg_type,Program_type.Prog_name,Year_info.year



What I have tried:

i try this ..

var re = (from  stdtable in a.Std_info
                            join catg in a.Catg_type on stdtable.Catg_id equals catg.Catg_id
                            join prog in a.Program_type on stdtable.Prog_id equals prog.Prog_id
                            join yea  in a.Year_info on stdtable.year_id equals yea.year_id
                           select new { Std_info = stdtable, Catg_type = catg,Program_type=prog,Year_info=yea });



now in sql query there is count use now how i use count in linq


how i done this

解决方案


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08-13 21:14