如何转换字符串中的存储过程来诠释

Question

下面的代码的工作，但结果是空，是谁帮我找问题，似乎还有问题转换成字符串中的最终结果

DECLARE @dp1 varchar 
DECLARE @dp2 varchar 
DECLARE @dp3 varchar 
DECLARE @dp4 varchar 

DECLARE @dpp1 int 
DECLARE @dpp2 int 
DECLARE @dpp3 int 
DECLARE @dpp4 int 


set @dp1 = 'Emkanat' 
set @dp2 = 'Masraf' 



if (@dp1= 'Emkanat') 
Begin 
set @dpp1= 8 
Select Emkanat*@dpp1 as val1 FROM Cardetail 
End 

if (@dp1= 'Tarahi') 
Begin 
set @dpp1= 8 
Select Tarahi*@dpp1 as val1 FROM Cardetail 
End 

if (@dp1= 'Sandogh') 
Begin 
set @dpp1= 8 
Select Sandogh*@dpp1 as val1 FROM Cardetail 
End 

if (@dp1= 'Masraf') 
Begin 
set @dpp1= 8 
Select Masraf*@dpp1 as val1 FROM Cardetail 
End 

if (@dp2= 'Emkanat') 
Begin 
set @dpp2= 7 
Select Emkanat*@dpp2 as val2 FROM Cardetail 
End 

if (@dp2= 'Tarahi') 
Begin 
set @dpp2= 7 
Select Tarahi*@dpp2 as val2 FROM Cardetail 
End 

if (@dp2= 'Sandogh') 
Begin 
set @dpp2= 7 
Select Sandogh*@dpp2 as val2 FROM Cardetail 
End 

if (@dp2= 'Masraf') 
Begin 
set @dpp2= 7 
Select Masraf*@dpp2 as val1 FROM Cardetail 
End 


SELECT 
Namecar, 
(Masraf*@dpp1)+(Sandogh*@dpp1)+(Tarahi*@dpp1)+(Emkanat*@dpp1)+(Masraf*@dpp2)+(Sandogh*@dpp2)+(Tarahi*@dpp2)+(Emkanat*@dpp2) 
as finalresult 
FROM Cardetail 

为int变量需要由varchar提供，然后根据字符获取int

Answer 1

代码问题在于您没有定义varchar变量的大小。改变你的代码，如下所示，你会得到你需要的输出。我已经将varchar大小定义为100，根据您的数据修改相同的值。

DECLARE @dp1 varchar(100) 
DECLARE @dp2 varchar(100) 
DECLARE @dp3 varchar(100) 
DECLARE @dp4 varchar(100)