SQL Server - 用于 XML 的 XQuery [英] SQL Server - XQuery for XML

问题描述

与其他帖子类似，我需要根据 Xml 列上的应用条件从表中检索任何行，例如，假设您有一个像这样的 xml 列:

Just similar other post, I need to retrieve any rows from table applying criteria on Xml column, for instance, supposing you have an xml column like this:

<DynamicProfile xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/WinTest">
  <AllData xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
    <d2p1:KeyValueOfstringstring>
      <d2p1:Key>One</d2p1:Key>
      <d2p1:Value>1</d2p1:Value>
    </d2p1:KeyValueOfstringstring>
    <d2p1:KeyValueOfstringstring>
      <d2p1:Key>Two</d2p1:Key>
      <d2p1:Value>2</d2p1:Value>
    </d2p1:KeyValueOfstringstring>
  </AllData>
</DynamicProfile>

我的查询将能够返回节点值 <d2p1:Key> 的所有行.= 'some key value' AND 节点值 <d2p1Value = 'some value value'.

My query would be able to return all rows where node value <d2p1:Key> = 'some key value' AND node value <d2p1Value = 'some value value'.

把它想象成一个动态表，其中 KEY 节点代表列名，Value 节点代表列的值.

Imagine of that just as a dynamic table where KEY node represent the column name and Value node represent column's value.

以下查询不起作用，因为键节点和值节点不是连续的:

The following query does not work because key and value nodes are not sequential:

select * from MyTable where
MyXmlField.exist('//d2p1:Key[.="One"]') = 1
AND MyXmlField.exist('//d2p1:Value[.="1"]') = 1 

推荐答案

而不是寻找 //d2p1:key[.="One"] 和 //d2p1:Value[.="1"] 作为两个单独的搜索，执行一次同时查找两个的查询，如下所示:

Instead of looking for //d2p1:key[.="One"] and //d2p1:Value[.="1"] as two separate searches, do a single query that looks for both at once, like so:

//d2p1:KeyValueOfstringstring[./d2p1:Key="One"][./d2p1:Value=1]

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