动态更改 XML 节点名称以循环浏览 SQL Server 中的长列表

Question

你们上次帮了大忙，我对 SQL Server 中的 XML 越来越熟悉了，但我还是个新手。

我最近的挑战是我的节点名称相同，最多 50 次，并且只有一个数字来区分它们：

<QuoteHeaderXML>
  <QuoteHeaderData>
    <QuoteHeader>
      <Configurable01 Value="" Name="Credit Memo" />
      <Configurable02 Value="" Name="Contact Person" />
      <Configurable04 Value="N/A" Name="Fed Ex Rated" />
      <Configurable05 Value="Not Branded" Name="Branding" />
      <Configurable06 Value="100%" Name="Project Status" />
      <Configurable07 Value="" Name="Project Name" />
      <Configurable08 Value="None" Name="Project Manager" />
      <Configurable09 Value="" Name="Shipping Notes" />
      <Configurable10 Value="False" Name="High Profile Order" />
      <Configurable11 Value="New Construction" Name="Project Type" />
      <Configurable12 Value="Single-family" Name="Channel" />
      <Configurable13 Value="US - Texas - Northern" Name="Job Location" />
      <Configurable20 Value="Dealer Warehouse" Name="Delivery Destination" />
    </QuoteHeader>
  </QuoteHeaderData>
</QuoteHeaderXML>

因此，如果我想提取 ConfigurableNN、名称和值的列，我必须编写这 50x 以将它们全部拉入它们存在的单独行中……或者为 50 个中的每一个调用每个最终在 150 多列表格中！我不喜欢这些选项。

相反，我希望编写代码来一次提取 ConfigurableNN、名称和值，但让它根据计数器动态更改节点的数量。但是，我看不到这样做，因为它抱怨 “XML 数据类型方法“值”的参数 1 必须是字符串文字。”。

这是我从我发现但无法工作的帖子中尝试和解决的问题......有任何建议还是这不可能？

WHILE @ConfigCounter <= 50
    BEGIN
        SET @CfgNum = case when @ConfigCounter < 10 then '0' else '' end + cast(@ConfigCounter as varchar(2));

        select t.x.value('(Configurable'+cast(@CfgNum as varchar(2))+'/@Name)[1]','varchar(255)')   ConfigurableFieldName
              ,t.x.value('(Configurable'+cast(@CfgNum as varchar(2))+'/@Value)[1]','varchar(255)')  ConfigurableFieldValue
          from @XMLData.nodes('//QuoteHeaderXML/QuoteHeaderData/QuoteHeader') as T(X)
         where t.x.value('(Configurable'+cast(@CfgNum as varchar(2))+'/@Value)[1]','varchar(255)') is not null      

        SET @ConfigCounter = @ConfigCounter + 1; 
    END

提前感谢您的帮助、提示和/或想法！ =)

Answer 1

如果此 XML 在您的控制之下，您应该更改它。这是一个非常糟糕的设计，将相同的元素用运行编号作为元素名称的一部分来分隔。如果你需要这个数字，你可以将它添加为属性，如

<Configurable Nr="01" Value="" Name="Credit Memo" />

你不一定需要它，因为元素在 am XML 中的顺序是有保证的（虽然不是属性的顺序），但它使一些查询更容易。

如果您必须坚持这一点，您可以使用星号* 一次性获取<QuoteHeader> 以下的所有节点：

DECLARE @xml XML = 
N'<QuoteHeaderXML>
  <QuoteHeaderData>
    <QuoteHeader>
      <Configurable01 Value="" Name="Credit Memo" />
      <Configurable02 Value="" Name="Contact Person" />
      <Configurable04 Value="N/A" Name="Fed Ex Rated" />
      <Configurable05 Value="Not Branded" Name="Branding" />
      <Configurable06 Value="100%" Name="Project Status" />
      <Configurable07 Value="" Name="Project Name" />
      <Configurable08 Value="None" Name="Project Manager" />
      <Configurable09 Value="" Name="Shipping Notes" />
      <Configurable10 Value="False" Name="High Profile Order" />
      <Configurable11 Value="New Construction" Name="Project Type" />
      <Configurable12 Value="Single-family" Name="Channel" />
      <Configurable13 Value="US - Texas - Northern" Name="Job Location" />
      <Configurable20 Value="Dealer Warehouse" Name="Delivery Destination" />
    </QuoteHeader>
  </QuoteHeaderData>
</QuoteHeaderXML>';

SELECT ConfigurableX.value(N'local-name(.)',N'nvarchar(max)') AS NodeName
      ,ConfigurableX.value(N'@Value',N'nvarchar(max)') AS Value
      ,ConfigurableX.value(N'@Name',N'nvarchar(max)') AS Name
FROM @xml.nodes(N'/QuoteHeaderXML/QuoteHeaderData/QuoteHeader/*') AS GetAllBelowQuoteHeader(ConfigurableX);

结果

+----------------+-----------------------+----------------------+
| NodeName       | Value                 | Name                 |
+----------------+-----------------------+----------------------+
| Configurable01 |                       | Credit Memo          |
+----------------+-----------------------+----------------------+
| Configurable02 |                       | Contact Person       |
+----------------+-----------------------+----------------------+
| Configurable04 | N/A                   | Fed Ex Rated         |
+----------------+-----------------------+----------------------+
| Configurable05 | Not Branded           | Branding             |
+----------------+-----------------------+----------------------+
| Configurable06 | 100%                  | Project Status       |
+----------------+-----------------------+----------------------+
| Configurable07 |                       | Project Name         |
+----------------+-----------------------+----------------------+
| Configurable08 | None                  | Project Manager      |
+----------------+-----------------------+----------------------+
| Configurable09 |                       | Shipping Notes       |
+----------------+-----------------------+----------------------+
| Configurable10 | False                 | High Profile Order   |
+----------------+-----------------------+----------------------+
| Configurable11 | New Construction      | Project Type         |
+----------------+-----------------------+----------------------+
| Configurable12 | Single-family         | Channel              |
+----------------+-----------------------+----------------------+
| Configurable13 | US - Texas - Northern | Job Location         |
+----------------+-----------------------+----------------------+
| Configurable20 | Dealer Warehouse      | Delivery Destination |
+----------------+-----------------------+----------------------+