带参数的动态sql

CREATE PROC Procout(@input  INT,
                    @result INT output)
AS
  BEGIN
      SET @result = @input
  END

go 

DECLARE @input INT

SET @input = 100

DECLARE @output INT

SET @output = 0

--声明执行sql
DECLARE @sql NVARCHAR(1000)

SET @sql = 'exec  procout
            @input_,
            @output_ out'
--定义参数列表
DECLARE @ParmDefinition NVARCHAR(500);

SET @ParmDefinition = N'@input_ int, @output_ int OUTPUT';

EXEC Sp_executesql
  @sql,
  @ParmDefinition,
  @input_ = @input,
  @output_ = @output output;

SELECT @output

go