这样的过程写的有异常吗? 有关问题解决立即结帖

这样的过程写的有错误吗? 问题解决立即结帖
ALTER   PROCEDURE     abcd
(
@sqlstr   nvarchar(4000)
)
AS
begin


declare       @p       INT          
    select   @sqlstr   = 'select     '[email protected]   ;
EXEC       sp_executesql         @sqlstr   ,N '@p       INT         OUTPUT ',@p       OUTPUT      
print   @p
end

----------------------------------
@sqlstr   为 'CASE   WHEN   45350> 23   THEN   30   ELSE   10   END '
[email protected]   = 'select   CASE   WHEN   50> 23   THEN   30   ELSE   10   END '
[email protected]
但print   @p   为空   无结果
???


------解决方案--------------------
select @sqlstr = 'select @p= '[email protected] ;
------解决方案--------------------
CREATE PROCEDURE abcd
(
@sqlstr nvarchar(4000)
)
AS
begin
declare @p INT
select @sqlstr = 'select @p= '[email protected] ;
EXEC sp_executesql @sqlstr ,N '@p INT OUTPUT ',@p OUTPUT
print @p
end
GO
EXEC abcd 'CASE WHEN 45350> 23 THEN 30 ELSE 10 END '
GO
Drop PROCEDURE abcd

--30
------解决方案--------------------
select @sqlstr = 'select '[email protected] ;

改為

select @sqlstr = 'select @p= '[email protected] ;

即可

[email protected]，所以就是null
------解决方案--------------------

--如何将exec执行结果放入变量中？

declare @num int, @sql nvarchar(4000)
set @sql= 'select @a=count(*) from tableName '
exec sp_executesql @sql,N '@a int output ',@num output
select @num

------解决方案--------------------
alter PROCEDURE abcd(@sqlstr nvarchar(4000))
AS
begin
declare @p INT
select @sqlstr = 'select @p= '[email protected]
EXEC sp_executesql @sqlstr ,N '@p INT OUTPUT ',@p OUTPUT
print @p
end
GO
EXEC abcd 'CASE WHEN 45350> 23 THEN 30 ELSE 10 END '