插入XML到SQL Server表

Question

鉴于这种XML：

<Documents> 
    <Batch BatchID = "1" BatchName = "Fred Flintstone"> 
     <DocCollection> 
      <Document DocumentID = "269" KeyData = "" /> 
      <Document DocumentID = "6" KeyData = "" /> 
      <Document DocumentID = "299" KeyData = ""  ImageFile="Test.TIF" /> 
     </DocCollection>  
    </Batch>  
    <Batch BatchID = "2" BatchName = "Barney Rubble"> 
     <DocCollection> 
      <Document DocumentID = "269" KeyData = "" /> 
      <Document DocumentID = "6" KeyData = "" /> 
     </DocCollection> 
    </Batch> 
</Documents> 

我需要将其插入表中的SQL Server格式为：

BatchID BatchName   DocumentID 
1   Fred Flintstone  269 
1   Fred Flintstone  6 
1   Fred Flintstone  299 
2   Barney Rubble  269 
2   Barney Rubble  6 

这个SQL：

SELECT 
     XTbl.XCol.value('./@BatchID','int') AS BatchID, 
     XTbl.XCol.value('./@BatchName','varchar(100)') AS BatchName, 
     XTbl.XCol.value('DocCollection[1]/DocumentID[1]','int') AS DocumentID 
    FROM @Data.nodes('/Documents/Batch') AS XTbl(XCol) 

给我这个结果：

BatchID BatchName  DocumentID 
1  Fred Flintstone NULL 
2  Barney Rubble NULL 

我在做什么错？

另外，有人可以推荐一个很好的SQL Server中的XML教程？

感谢

卡尔

Answer 1

你接近。

使用通配符和CROSS APPLY，可以生成多个记录。

更改别名为lvl1和lvl2以更好地说明。

Declare @XML xml = ' 
<Documents> 
    <Batch BatchID = "1" BatchName = "Fred Flintstone"> 
     <DocCollection> 
      <Document DocumentID = "269" KeyData = "" /> 
      <Document DocumentID = "6" KeyData = "" /> 
      <Document DocumentID = "299" KeyData = ""  ImageFile="Test.TIF" /> 
     </DocCollection>  
    </Batch>  
    <Batch BatchID = "2" BatchName = "Barney Rubble"> 
     <DocCollection> 
      <Document DocumentID = "269" KeyData = "" /> 
      <Document DocumentID = "6" KeyData = "" /> 
     </DocCollection> 
    </Batch> 
</Documents> 
' 

Select BatchID = lvl1.n.value('@BatchID','int') 
     ,BatchName = lvl1.n.value('@BatchName','varchar(50)') 
     ,DocumentID = lvl2.n.value('@DocumentID','int') 
From @XML.nodes('Documents/Batch') lvl1(n) 
Cross Apply lvl1.n.nodes('DocCollection/Document') lvl2(n) 

返回

BatchID BatchName  DocumentID 
1  Fred Flintstone 269 
1  Fred Flintstone 6 
1  Fred Flintstone 299 
2  Barney Rubble 269 
2  Barney Rubble 6