是否可以在存儲過程的參數中放置一個列名？

Question

我具有類似於下面

Date |field1 | qty1 | qty2 | qty3 
1 Aug | xyz | 0 | 0 | 3 
1 Aug | xyz | 3 | 0 | 0 
1 Aug | abc | 0 | 5 | 0 
2 Aug | abc | 0 | 15 | 0 
2 Aug | xyz | 0 | 12 | 0 
2 Aug | xyz | 5 | 0 | 0 

我寫三個存儲過程，以如下面分別顯示每個數量的表。

這是我的第一個程序

create procedure firstprocedure 
@startdate datetime, @enddate datetime 
As 
select date, sum (case when field1 = 'xyz', qty1) as XYZ, 
sum (case when field1 = 'abc', qty1) as ABC 
from table1 
where date between @startdate and @enddate 
group by date 

這是我的第二個過程

Create procedure secondprocedure 
@startdate datetime, @enddate datetime 
As 
select date, sum (case when field1 = 'xyz', qty2) as XYZ, 
sum (case when field1 = 'abc', qty2) as ABC 
from table1 
where date between @startdate and @enddate 
group by date 

這是我的第三個過程

Create procedure thirdprocedure 
@startdate datetime, @enddate datetime 
As 
select date, sum (case when field1 = 'xyz', qty3) as XYZ, 
sum (case when field1 = 'abc', qty3) as ABC 
from table1 
where date between @startdate and @enddate 
group by date 

我不知道有沒有機會，我只需將列（不管是qty1，qty2還是qty3）在參數和執行時只是提及，如果我想qty1 o r qty2或qty3。它應該產生相應的輸出。

Answer 1

試試這個：

創建這樣一個過程：

create procedure my_procedure(@startdate datetime, @enddate datetime,@qty_type varchar(50)) 
as 
begin 
    with cte as( 
    select 'qty1' [col_name],date, sum (case when field1 = 'xyz' then qty1 end) as XYZ, 
    sum (case when field1 = 'abc' then qty1 end) as ABC 
    from table1 
    where date between @startdate and @enddate 
    group by date 
    union all 
    select 'qty2' [col_name],date, sum (case when field1 = 'xyz' then qty2 end) as XYZ, 
    sum (case when field1 = 'abc' then qty2 end) as ABC 
    from table1 
    where date between @startdate and @enddate 
    group by date 
    union all 
    select 'qty3' [col_name],date, sum (case when field1 = 'xyz' then qty3 end) as XYZ, 
    sum (case when field1 = 'abc' then qty3 end) as ABC 
    from table1 
    where date between @startdate and @enddate 
    group by date 
    )select * from cte where [col_name]=@qty_type 
end 

然後執行它：

exec '2012-04-01','2012-05-01','qty1' 

或

exec '2012-04-01','2012-05-01','qty2' 

Answer 2

你可以使用動態SQL作爲如下所示：

CREATE PROCEDURE procedureName 
    @ColumnName NVARCHAR(100), 
    @startdate datetime, 
    @enddate datetime 
AS 
DECLARE @SQL NVARCHAR(MAX) 
SET @SQL = N' 
    select date, sum (case when field1 = ''''xyz'''', ' + @ColumnName + ') as XYZ, 
    sum (case when field1 = ''''abc'''', ' + @ColumnName + ') as ABC 
    from table1 
    where date between ' + CONVERT(DateTime, @startdate, 101) + 
     ' and ' + CONVERT(DateTime, @enddate, 101) + 
    'group by date' 

EXEC(@SQL) 

您可以調用存儲過程以這種方式（從SQL）：

EXEC procedureName 'qty1', '01/01/2012', '01/01/2011' 

注意

當我用CONVERT(DateTime, @startdate, 101)，你將不得不改變風格值（目前爲101）以滿足您使用的日期格式的要求。詳情請參閱此頁面：MSDN CONVERT