TSQL代碼來同步兩個XML文檔

Question

XML 1

<Team> 
    <Players> 
    <Player id="1" timestamp="11/03/2012 08:10:12">30</Player> 
    <Player id="2" timestamp="11/02/2012 09:11:12">40</Player> 
    <Players> 
</Team> 

XML 2

<Team> 
    <Players> 
    <Player id="1" timestamp="11/02/2012 09:10:12">10</Player> 
    <Player id="2" timestamp="11/03/2012 10:11:12">20</Player> 
    <Player id="3" timestamp="11/03/2012 13:00:00">50</Player> 
    <Players> 
</Team> 

OUTPUT當我們合併基於時間戳元件上的上述兩個個XML：

<Team> 
    <Players> 
    <Player id="1" timestamp="11/02/2012 09:10:12">30</Player> 
    <Player id="2" timestamp="11/03/2012 10:11:12">20</Player> 
    <Player id="3" timestamp="11/03/2012 13:00:00">50</Player> 
    <Players> 
</Team> 

任何人都可以請幫我與T-SQL代碼來做到這一點在SQL Server 2005/2008

Answer 1

使用帶有兩個嵌套的CTE的這種方法，你可以親近 - 但不是所有的方式：

DECLARE @XML1 XML = '<Team> 
    <Players> 
    <Player id="1" timestamp="11/03/2012 08:10:12">30</Player> 
    <Player id="2" timestamp="11/02/2012 09:11:12">40</Player> 
    </Players> 
</Team>' 

DECLARE @XML2 XML = '<Team> 
    <Players> 
    <Player id="1" timestamp="11/02/2012 09:10:12">10</Player> 
    <Player id="2" timestamp="11/03/2012 10:11:12">20</Player> 
    <Player id="3" timestamp="11/03/2012 13:00:00">50</Player> 
    </Players> 
</Team>' 

-- extract the ID, Timestamp and node values from both XML variables 
;WITH CTE AS 
(
SELECT 
    ID = P1.value('@id', 'int'), 
    TS = P1.value('@timestamp', 'datetime2'), 
    NodeValue = P1.value('(.)[1]', 'int') 
FROM @XML1.nodes('/Team/Players/Player') AS XTbl1(P1) 

UNION 

SELECT 
    ID = P2.value('@id', 'int'), 
    TS = P2.value('@timestamp', 'datetime2'), 
    NodeValue = P2.value('(.)[1]', 'int') 
FROM @XML2.nodes('/Team/Players/Player') AS XTbl2(P2) 
), 
-- partition and sequentially number the result, so that the newest 
-- (most recent) item can be extracted 
CTE2 AS 
(
    SELECT ID, TS, NodeValue, 
     RowNum = ROW_NUMBER() OVER(PARTITION BY ID ORDER BY TS DESC) 
    FROM CTE 
) 
SELECT 
    ID AS '@id', 
    TS AS '@timestamp', 
    NodeValue AS 'text()' 
FROM CTE2 
WHERE RowNum = 1 
FOR XML PATH('Player'), ROOT('Players') 

結果是這樣的輸出：

<Players> 
    <Player id="1" timestamp="2012-11-03T08:10:12">30</Player> 
    <Player id="2" timestamp="2012-11-03T10:11:12">20</Player> 
    <Player id="3" timestamp="2012-11-03T13:00:00">50</Player> 
</Players>