Question

我的SQL Server表中有XML类型列，该表中的XML文档如下所示：

<?xml version="1.0" encoding="utf-16"?>  
<Product xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">    
    <Key xmlns="urn:microsoft-dynamics-schemas/page/product">48;nyI9AAJ7/1AAVQBCADYAAAACe/8xAC4AMAAwAAAAAIfei8sC11;152438283530;</Key>    
    <Code xmlns="urn:microsoft-dynamics-schemas/page/product">PR238</Code>    
    <Version xmlns="urn:microsoft-dynamics-schemas/page/product">1.00</Version>    
    <ExternalRefNr xmlns="urn:microsoft-dynamics-schemas/page/product">46894046</ExternalRefNr>    
    <Name xmlns="urn:microsoft-dynamics-schemas/page/product">Nailgun XJ-3</Name>  
</Product>

现在，在SQL Server（X）查询中，我想选择该产品的名称（Nailgun XJ-3），但无论我尝试什么，我总是得到一个空的结果。

我想它应该是简单的，就像下面的一行，但我错过了一些东西。也许这是对命名空间的处理，但我找不到合适的方法来做到这一点。

SELECT ProductDetailSourceXML.query('//Name') FROM Product

Answer 1

是的，它是XML命名空间 - 因为它存在，你必须尊重它并妥善处理它！

试试这个：

DECLARE @tbl TABLE (ID INT NOT NULL, ProductsDetailXML XML)

INSERT INTO @tbl VALUES(1, N'<?xml version="1.0" encoding="utf-16"?>  
<Product xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">    
    <Key xmlns="urn:microsoft-dynamics-schemas/page/product">48;nyI9AAJ7/1AAVQBCADYAAAACe/8xAC4AMAAwAAAAAIfei8sC11;152438283530;</Key>    
    <Code xmlns="urn:microsoft-dynamics-schemas/page/product">PR238</Code>    
    <Version xmlns="urn:microsoft-dynamics-schemas/page/product">1.00</Version>    
    <ExternalRefNr xmlns="urn:microsoft-dynamics-schemas/page/product">46894046</ExternalRefNr>    
    <Name xmlns="urn:microsoft-dynamics-schemas/page/product">Nailgun XJ-3</Name>  
</Product>')

-- define the XML namespace and a prefix to use in your XQuery    
;WITH XMLNAMESPACES('urn:microsoft-dynamics-schemas/page/product' AS ns)
SELECT
    ID,
    -- use the XML namespace prefix where needed!
    ProductName = XC.value('(ns:Name)[1]', 'varchar(50)')
FROM 
    @tbl
CROSS APPLY 
    ProductsDetailXML.nodes('/Product') AS XT(XC)
WHERE
    ID = 1

SQL Server XQuery，我该如何选择一个值

1 个答案: