Question

这就是我想要做的事情

  
Declare @Var varchar(50)
Declare @Num1 varchar(50)
Declare @Num2 varchar(50)
Declare @Counter smallint

Set @Counter=1
Set @Num1='Hello'
Set @Num2='Hi'

while (@Counter<2)
 begin
   Set @Var=N'@Num'+convert(varchar,@Counter)
   //Now I want to get the value of '@Num1' that is stored in @Var when @Counter=1
   //Help Needed
 Set @Counter=@Counter+1
 end

Answer 1

这对你的问题不是一个非常优雅的解决方案，但至少它解决了它：）

 Declare @Var varchar(50)
 Declare @Num1 varchar(50)
 Declare @Num2 varchar(50)
 Declare @Counter smallint
 Declare @text varchar(50)

 Set @Counter=1
 Set @Num1='Hello'
 Set @Num2='Hi'

 while (@Counter<3)
 begin
 SET @text =
     CASE @Counter 
          WHEN 1 THEN @Num1
          WHEN 2 THEN @Num2
     END
 Set @Counter=@Counter+1
 print @text
 end

Answer 2

AFAIK，你不能直接这样做;有什么不妥之处：

SET @Var = SELECT CASE @Counter WHEN 1 THEN @Num1 ELSE @Num2 END

如果您有很多值，请考虑使用#table（临时表）或@table（表变量） - 即

DECLARE @Data TABLE ([Key] int NOT NULL, [Value] varchar(50))

然后只需INSERT / UPDATE进入@DATA

SELECT @Var = [Value] FROM @Data WHERE [Key] = @Counter

Answer 3

@ Num1的值将始终为“Hello”。原因是你只在@Var中存储一个字符串。

获取存储在SQL Sproc中的变量名的值

3 个答案: