SQLSERVER2000中表变量的应用(By downmoon)

原语句如下：

declare @d datetime
set @d = getdate ()
SELECT [ P_ID ] FROM [ ProductInfo ]
WHERE [ P_ID ] IN
( 28674 , 28667 , 28241 , 355 , 7210 , 14646 , 2164 , 11891 , 4519 , 14671 , 21788 , 21816 , 21817 , 21108 , 21196 )
select [ 语句执行花费时间(毫秒) ] = datediff (ms, @d , getdate ())

现要求按括号中的ID顺序输出结果

此时，　可以用到SQLSERVER2000以上版本中特有的表变量(table)（亦可用临时表，但性能还是有不小的差距）

结果语句如下：

declare @d2 datetime
set @d2 = getdate ()
declare @list Nvarchar ( 4000 )
declare @str Nvarchar ( 10 )
declare @orderid int
declare @tmp int

Declare @TableVar Table (OrderID int Primary Key ,TestID int )

set @list = ' 28674,28667,28241,355,7210,14646,2164,11891,4519,14671,21788,21816,21817,21108,21196 '
set @orderid = 0
while ( charindex ( ' , ' , @list ) > 0 )
begin

set @str = substring ( @list , 1 , charindex ( ' , ' , @list ))
print @str
set @tmp = cast ( Replace ( @str , ' , ' , '' ) as int )
print @tmp
set @list = substring ( @list , len ( @str ) + 1 , len ( @list ) - len ( @str ) + 1 )
-- --set@str=Replace(@str,',','')
set @orderid = @orderid + 1
print @orderid
Insert Into @TableVar Values ( @orderid , @tmp )
end

-- SelectTestIDFrom@TableVarorderbyOrderID


select [ P_ID ] from productinfop
inner join @TableVar a
on p.p_ID = a.TestID
order by a.OrderID

select [ 语句执行花费时间(毫秒) ] = datediff (ms, @d2 , getdate ())