Comment convertir ce script SQL dynamique en LinqToSql?

Question

Comment convertir ce script SQL dynamique en LinqToSql?

-- Create sample table 

Create Table TEST 
(DATES Varchar(6), 
EMPNO Varchar(5), 
STYPE Varchar(1), 
AMOUNT Int) 

-- Insert sample data 

Insert TEST Select '200605', '02436',  'A',  5 
Union All Select '200605', '02436',  'B',  3 
Union All Select '200605', '02436',  'C',  3 
Union All Select '200605', '02436',  'D',  2 
Union All Select '200605', '02436',  'E',  9 
Union All Select '200605', '02436',  'F',  7 
Union All Select '200605', '02436',  'G',  6 
Union All Select '200605', '02438',  'A',  7 
Union All Select '200605', '02438',  'B',  8 
Union All Select '200605', '02438',  'C',  0 
Union All Select '200605', '02438',  'D',  3 
Union All Select '200605', '02438',  'E',  4 
Union All Select '200605', '02438',  'F',  5 
Union All Select '200605', '02438',  'G',  1 
GO 



-- the sql script which I want to convert into LinqToSql 

Declare @S Varchar(1000) 
Set @S='' 

Select @S=@S+',SUM(Case STYPE When '''+STYPE+''' Then AMOUNT Else 0 End) As '+STYPE 
From (Select Distinct STYPE From TEST) A Order By STYPE 

Set @S='Select DATES,EMPNO'+@S+' From TEST Group By DATES,EMPNO Order By DATES,EMPNO' 
EXEC(@S) 
GO 

Answer 1

Vous n'avez pas besoin de SQL dynamique pour calculer ces sommes. Cette requête calcule chaque nombre dont vous avez besoin.

SELECT Dates, EmpNo, SType, SUM(Amount) 
FROM Temp 
GROUP BY Dates, EmpNo, SType 
ORDER BY Dates, EmpNo, SType 

et il est facilement traduit en LinqToSql. Une fois que vous avez ces sommes en mémoire, alors vous pouvez faire le résultat qui vous plait.