关于ADP交叉查询

配货表PH_table,有字段sc_name,sort,sp_name,h_number,nsize,ph_amount.

我以钱老师的实例为蓝本,制作了交叉查询代码如下.

ALTER procedure CorssTab
(@sc_name nvarchar(20),@sort nvarchar(6))
AS
DECLARE @strSql as varchar(1000), @strTmpCol as varchar(100)
EXECUTE ('DECLARE corss_cursor CURSOR FOR Select DISTINCT sc_name,h_number,Nsize from Ph_table where (sc_name=@sc_name) AND (sort=@sort) for read only') begin
SET nocount ON
SET @strsql ='select sp_name,h_number, sum(ph_amount) AS [合计数量]'  OPEN corss_cursor
while (0=0)
BEGIN
FETCH NEXT FROM corss_cursor  

INTO @strTmpCol
if (@@fetch_status<>0) break
SET @strsql = @strsql + ', sum(CASE Nsize WHEN '' + @strTmpCol + '' THEN ph_amount ELSE Null END) AS [' + @strTmpCol + ']' 查询*/
END
SET @strsql = @strsql + ' from ph_table group by sp_name,h_number'  

EXECUTE(@strsql)

IF @@error <>0 RETURN @@error 

CLOSE corss_cursor
DEALLOCATE corss_cursor RETURN 0

end

以上代码,如果删除参数条件,执行正确.可有上面的参数执行时,总时提示"必须声明变量sc_name".不是已经声明了吗.请老师们指点.