Sql server 与XML名称空间节点查询斗争

在使用XML节点时，我很难理解XML名称空间查询——我已经阅读了这里的其他类似问题和一篇文章，但无法将其应用于我的特定查询

我有这个示例XML的更大版本：

SELECT CAST('<Navigator clsid="{ABF8EB05-610D-11D3-A53E-684F745C}">
  <Version>7</Version>
  <NavigatorNodes clsid="{0484ACB1-78F5-48D7-A26B-3A0ACD3A5F91}">
    <NavigatorNode clsid="{59AB61BD-7833-4954-94C2-B6D737E3DD6F}">
      <Indent>0</Indent>
      <Caption>Contact</Caption>
      <Selected>0</Selected>
      <ViewType>0</ViewType>
      <ViewSubType>0</ViewSubType>
      <ShowTotals>0</ShowTotals>
      <RowHeight>0</RowHeight>
      <Complement>0</Complement>
      <FreezeFirst>0</FreezeFirst>
      <a1:QueryFilter xmlns:a2="http://www.ascenttechnology.co.uk/schemas/entities" xmlns:xsi="http://www.w3.org/21/XMLSchema-instance" xmlns:a1="http://www.ascenttechnology.co.uk/schemas/services" Type="QueryFilter">
        <entity_name>Contact</entity_name>
        <relationship_name />
        <relationship_from_entity_name />
        <a1:ColumnInfoCollection Type="ColumnInfoCollection" AscentCollection="true">
          <__vers>1</__vers>
          <IgnoreMissingItem>0</IgnoreMissingItem>
          <ReadOnly>0</ReadOnly>
          <AllowNulls>0</AllowNulls>
          <a1:ColumnInfo Type="ColumnInfo">
            <attribute_name>state</attribute_name>
            <width>0</width>
          </a1:ColumnInfo>
          <a1:ColumnInfo Type="ColumnInfo">
            <attribute_name>current_address_suffix</attribute_name>
            <width>0</width>
          </a1:ColumnInfo>
        </a1:ColumnInfoCollection>
        <a1:SurveyColumnInfoCollection Type="AttributeInfoCollection" AscentCollection="true">
          <__vers>1</__vers>
          <IgnoreMissingItem>0</IgnoreMissingItem>
          <ReadOnly>0</ReadOnly>
          <AllowNulls>0</AllowNulls>
        </a1:SurveyColumnInfoCollection>
        <a1:WorkflowColumnInfoCollection Type="AttributeInfoCollection" AscentCollection="true">
          <__vers>1</__vers>
          <IgnoreMissingItem>0</IgnoreMissingItem>
          <ReadOnly>0</ReadOnly>
          <AllowNulls>0</AllowNulls>
        </a1:WorkflowColumnInfoCollection>
        <a1:ConditionCollection Type="ConditionCollection" AscentCollection="true">
          <__vers>1</__vers>
          <IgnoreMissingItem>0</IgnoreMissingItem>
          <ReadOnly>0</ReadOnly>
          <AllowNulls>0</AllowNulls>
          <a1:Condition Type="Condition">
            <attribute_name>class</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>28</operator>
            <value1>1</value1>
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>do_not_mail</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>0</operator>
            <value1>True</value1>
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>gone_away</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>0</operator>
            <value1>True</value1>
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>dp_opt_out</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>0</operator>
            <value1>True</value1>
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>deceased</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>0</operator>
            <value1>True</value1>
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>deleted</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>0</operator>
            <value1>True</value1>
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>Date_Of_Birth</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>19</operator>
            <value1>2010-06-23T::.+:</value1>
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>home_address1</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>26</operator>
            <value1 xsi:nil="true" />
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>home_postcode</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>26</operator>
            <value1 xsi:nil="true" />
            <value2 xsi:nil="true" />
            <indent_level>1</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>home_address1</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>0</operator>
            <value1 />
            <value2 xsi:nil="true" />
            <indent_level>0</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
          <a1:Condition Type="Condition">
            <attribute_name>home_postcode</attribute_name>
            <description1 />
            <description2 />
            <attribute_id>0</attribute_id>
            <not>0</not>
            <operator>0</operator>
            <value1 />
            <value2 xsi:nil="true" />
            <indent_level>1</indent_level>
            <value1_is_reference>0</value1_is_reference>
            <value2_is_reference>0</value2_is_reference>
          </a1:Condition>
        </a1:ConditionCollection>
        <a1:OrderByCollection Type="OrderByCollection" AscentCollection="true">
          <__vers>1</__vers>
          <IgnoreMissingItem>0</IgnoreMissingItem>
          <ReadOnly>0</ReadOnly>
          <AllowNulls>0</AllowNulls>
        </a1:OrderByCollection>
        <SelectedArticles xsi:nil="true" />
        <groupby_field_name />
        <reporting_currency>52</reporting_currency>
        <Negate_Filter>0</Negate_Filter>
        <Survey_Id>----</Survey_Id>
        <Survey_Name xsi:nil="true" />
        <Workflow_Id>----</Workflow_Id>
        <Workflow_Name xsi:nil="true" />
        <XPath>0</XPath>
        <locale>0</locale>
      </a1:QueryFilter>
    </NavigatorNode>
  </NavigatorNodes>
</Navigator>' AS XML) as xmldata

但是当我靠近带名称空间的节点时，它们总是返回空白-我能够从节点一直拉数据到

“/Navigator/NavigatorNodes/NavigatorNode”

，但是没有运气

---

谢谢

您声明

默认值'http://www.w3.org/21/XMLSchema-instance“

但您的XML字符串甚至没有默认名称空间

试一试

---

我想这可能会起作用——因为我对XML名称空间不熟悉，我怎么知道是否包含默认名称空间？@Davin：当顶级元素中有

xmlns=“…”

声明时。普通的名称空间会被分配一个前缀，比如

xmlns:prefix=“namespace uri”

，而默认的名称空间却没有。这工作非常出色，并且学到了一些新的东西。谢谢

;WITH XMLNAMESPACES(
'http://www.ascenttechnology.co.uk/schemas/services' AS a1
,'http://www.ascenttechnology.co.uk/schemas/entities' AS a2
,DEFAULT 'http://www.w3.org/21/XMLSchema-instance'
)
SELECT 
#xmldata.*
,ref.value('attribute_name[1]','NVARCHAR(50)') as attribute_name
FROM #xmldata
CROSS APPLY xmldata.nodes('/Navigator/NavigatorNodes/NavigatorNode/a1:QueryFilter/a1:ConditionCollection/a1:Condition') T(ref)

WITH XMLNAMESPACES(
  'http://www.ascenttechnology.co.uk/schemas/services' AS a1
, 'http://www.ascenttechnology.co.uk/schemas/entities' AS a2
)