如何获取存储过程的返回值和输出值

create PROCEDURE mytest 
(
@returnval decimal OUTPUT --定义一个输出变量
)
as
DECLARE @amount DECIMAL
DECLARE mycursor CURSOR FOR SELECT Amount FROM dbo.test --定义一个游标
OPEN mycursor 
FETCH NEXT FROM mycursor INTO @amount
WHILE @@FETCH_STATUS=0 
BEGIN
 IF(@amount=100)BEGIN
  SET @returnval = @amount
 END
 FETCH NEXT FROM mycursor INTO @amount
END 
CLOSE mycursor 
DEALLOCATE mycursor
RETURN 1;
GO

DECLARE @output DECIMAL
DECLARE @val INT
EXEC @val=mytest @returnval = @output OUTPUT
SELECT @val,@output