節省了FOR XML AUTO結果變量在SQL

Question

select @result=@input.query('*') 
for xml raw,type 

上面的語句將產生以下警告：
消息6819，級別16，狀態3，行2
FOR XML子句不是在賦值語句允許。

Answer 1

例如

DECLARE @xml_var XML 
SET @xml_var = 
(
    SELECT *, 
    ( 
     SELECT * 

     FROM Orders 

     WHERE Orders.CustomerID=Customers.CustomerID 

     FOR XML AUTO, TYPE 

    ) 

    FROM Customers WHERE CustomerID='ALFKI' 

    FOR XML AUTO, TYPE 

) 

參考： http://blogs.msdn.com/sqlprogrammability/articles/576095.aspx

Answer 2

對於那些使用SQL Server 2000，FOR XML基本是沒用的;你不能生成的XML分配到一個變量，插入表，等我有需要時做手工，這是我的示例：

SET NOCOUNT ON 

create table #parcelData (
    parcelID int 
    , [description] varchar(20) 
) 
--insert sample data 
insert into #parcelData 
select 1, 'apples' UNION 
select 3, 'oranges' UNION 
select 25, 'bananas' UNION 
select 69, 'maracuja' 


print '-- Example 1: FOR XML RAW --' 
select parcelID as pID 
from #parcelData 
ORDER BY parcelID 
FOR XML RAW 
--> <row pID="17"/><row pID="25"/><row pID="26"/><row pID="333"/> 



print '-- Example 2: Build XML Manually --' 

declare @parcelRow varchar(50), @dummy int 
    , @xmlRowStr varchar(8000) 
set @xmlRowStr = '' -- initialize. 

DECLARE parcel_cursor CURSOR FOR 
    select DISTINCT '<row pID="' + cast(parcelID as varchar(10)) + '"/>', parcelID as parcelRow 
    from #parcelData 
    ORDER BY parcelID 
OPEN parcel_cursor 

FETCH NEXT FROM parcel_cursor 
INTO @parcelRow, @dummy 

WHILE @@FETCH_STATUS = 0 BEGIN 
    -- build the xml row by row. 
    set @xmlRowStr = @xmlRowStr + @parcelRow 

    -- Get next row 
    FETCH NEXT FROM parcel_cursor 
    INTO @parcelRow, @dummy 
END 

CLOSE parcel_cursor 
DEALLOCATE parcel_cursor 
--print @xmlRowStr 

-- wrap a root element around 
if @xmlRowStr != '' begin 
    set @xmlRowStr = '<ROOT>' + @xmlRowStr + '</ROOT>' 
end 
select @xmlRowStr as XmlOut 


DROP TABLE #parcelData 

SET NOCOUNT OFF