如何使用SQL变量获取一个存储过程的返回值
如题：
CREATE PROCEDURE [dbo].[ReturnPayKey_no]
@Key_no varchar(1000) output,
@P_type varchar(1000),
@input_date datetime,
@Opter varchar(100)
AS
BEGIN
SET NOCOUNT ON
declare @code varchar(100)
declare @i int
declare @ii int
declare @input varchar(6)
declare @str varchar(10)
set @code=(select ptype_code from t_ptype where ptype_name=@p_type);
set @input=(select replace(CONVERT(char(7),@input_date,111),'/',''));
set @i=(select isnull(max(Convert(int,right(key_no,3))),0) from t_payout where p_type=@p_type and input_d=@input_date and opter=@Opter)+1;
set @ii=len(Convert(varchar(10),@i))
if @ii=1
begin
set @str='00'+Convert(varchar(10),@i)
end
else if @ii=2
begin
set @str='0'+Convert(varchar(10),@i)
end
else
begin
set @str=Convert(varchar(10),@i)
end
set @Key_no=@code+@input+@str
select @Key_no
return @@error

END

CREATE PROCEDURE [dbo].[InserIntoPayout]
@Pay_id int output,
@Key_no varchar(1000) output,
@Input_d datetime,
@Input_date datetime,
@Onput_date datetime,
@Opter varchar(1000),
@State int,
@P_type varchar(100),
@Nominal varchar(1000)
AS
BEGIN
SET NOCOUNT ON;
Exec ReturnPayKey_no @Key_no,@P_type,@Input_d,@Opter
print @Key_no
END




[解决办法]
如果是单一值,参考:

SQL code

D. 使用 OUTPUT 参数OUTPUT 参数允许外部过程、批处理或多条 Transact-SQL 语句访问在过程执行期间设置的某个值。下面的示例创建一个存储过程 (titles_sum)，并使用一个可选的输入参数和一个输出参数。首先，创建过程：USE pubsGOIF EXISTS(SELECT name FROM sysobjects      WHERE name = 'titles_sum' AND type = 'P')   DROP PROCEDURE titles_sumGOUSE pubsGOCREATE PROCEDURE titles_sum @@TITLE varchar(40) = '%', @@SUM money OUTPUTASSELECT 'Title Name' = titleFROM titles WHERE title LIKE @@TITLE SELECT @@SUM = SUM(price)FROM titlesWHERE title LIKE @@TITLEGO接下来，将该 OUTPUT 参数用于控制流语言。 说明  OUTPUT 变量必须在创建表和使用该变量时都进行定义。参数名和变量名不一定要匹配，不过数据类型和参数位置必须匹配（除非使用 @@SUM = variable 形式）。 DECLARE @@TOTALCOST moneyEXECUTE titles_sum 'The%', @@TOTALCOST OUTPUTIF @@TOTALCOST < 200 BEGIN   PRINT ' '   PRINT 'All of these titles can be purchased for less than $200.'ENDELSE   SELECT 'The total cost of these titles is $'          + RTRIM(CAST(@@TOTALCOST AS varchar(20)))下面是结果集：Title Name                                                               ------------------------------------ The Busy Executive's Database GuideThe Gourmet MicrowaveThe Psychology of Computer Cooking(3 row(s) affected)Warning, null value eliminated from aggregate. All of these titles can be purchased for less than $200.
[解决办法]
探讨


如果是单一值,参考:
SQL code
D. 使用 OUTPUT 参数
OUTPUT 参数允许外部过程、批处理或多条 Transact-SQL 语句访问在过程执行期间设置的某个值。下面的示例创建一个存储过程 (titles_sum)，并使用一个可选的输入参数和一个输出参数。

首先，创建过程：

USE pubs
GO
IF EXISTS(SELECT name FROM sysobject……

[解决办法]
SQL code
存储过程之间的相互调用 
  
 第一种方法: 使用output参数 
  
 USE AdventureWorks; 
 GO 
 IF OBJECT_ID ( 'Production.usp_GetList', 'P' ) IS NOT NULL  
   DROP PROCEDURE Production.usp_GetList; 
 GO 
 CREATE PROCEDURE Production.usp_GetList @product varchar(40)  
   , @maxprice money  
   , @compareprice money OUTPUT 
   , @listprice money OUT 
 AS 
   SELECT p.name AS Product, p.ListPrice AS 'List Price' 
   FROM Production.Product p 
   JOIN Production.ProductSubcategory s  
   ON p.ProductSubcategoryID = s.ProductSubcategoryID  
 
   WHERE s.name LIKE @product AND p.ListPrice  < @maxprice; 
 -- Populate the output variable @listprice. 
 SET @listprice = (SELECT MAX(p.ListPrice) 
     FROM Production.Product p 
     JOIN  Production.ProductSubcategory s  
     ON p.ProductSubcategoryID = s.ProductSubcategoryID 
     WHERE s.name LIKE @product AND p.ListPrice  < @maxprice); 
 -- Populate the output variable @compareprice. 
 SET @compareprice = @maxprice; 
 GO 
  
  
 另一个存储过程调用的时候: 
  
 Create Proc Test 
 as 
 DECLARE @compareprice money, @cost money  
 EXECUTE Production.usp_GetList '%Bikes%', 700,  
   @compareprice OUT,  
   @cost OUTPUT 
 IF @cost  <= @compareprice  
 BEGIN 
   PRINT 'These products can be purchased for less than  
   $'+RTRIM(CAST(@compareprice AS varchar(20)))+'.' 
 END 
 ELSE 
   PRINT 'The prices for all products in this category exceed  
   $'+ RTRIM(CAST(@compareprice AS varchar(20)))+'.' 
 第二种方法:创建一个临时表 
  
 create proc GetUserName 
 as 
 begin 
   select 'UserName' 
 end 
  
 Create table #tempTable (userName nvarchar(50)) 
 insert into #tempTable(userName) 
 exec GetUserName 
  
 select #tempTable 
  
 --用完之后要把临时表清空 
 drop table #tempTable--需要注意的是，这种方法不能嵌套。例如： 
  
 procedure   a    
 begin    
   ...    
   insert   #table   exec   b    
 end    
    
 procedure   b    
 begin    
   ...    
   insert   #table  exec   c    
   select   *   from   #table    
 end    
    
 procedure   c    
 begin    
   ...    
   select   *   from   sometable    
 end   
  
 --这里ａ调ｂ的结果集，而ｂ中也有这样的应用ｂ调了ｃ的结果集，这是不允许的， 
 --会报“INSERT EXEC 语句不能嵌套”错误。在实际应用中要避免这类应用的发生。 
  
  
 第三种方法:声明一个变量,用exec(@sql)执行: 
  
 1);EXEC 执行SQL语句 
  
 declare @rsql varchar(250) 
     declare @csql varchar(300) 
     declare @rc nvarchar(500) 
     declare @cstucount int 
     declare @ccount int 
     set @rsql='(select Classroom_id from EA_RoomTime where zc='+@zc+' and xq='+@xq+' and T'+@time+'=''否'') and ClassroomType=''1''' 
     --exec(@rsql) 
     set @csql='select @a=sum(teststucount),@b=sum(classcount) from EA_ClassRoom where classroom_id in ' 
     set @rc=@csql+@rsql 
     exec sp_executesql @rc,N'@a int output,@b int output',@cstucount output,@ccount output--将exec的结果放入变量中的做法 
     --select @csql+@rsql 
     --select @cstucount 
  
  
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