Sql server XML仅在文本存在时查找和删除

因此，在M$SQL 2014企业数据库中使用以下内容：

DECLARE @table TABLE (XmlCol XML)
INSERT INTO @table (XmlCol) VALUES ('
<DEFeatureClassInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:typens="http://www.esri.com/schemas/ArcGIS/10.8" xsi:type="typens:DEFeatureClassInfo">
  <GPFieldInfoExs xsi:type="typens:ArrayOfGPFieldInfoEx">
    <GPFieldInfoEx xsi:type="typens:GPFieldInfoEx">
      <Name>UNITCODE</Name>
      <AliasName>UNITCODE</AliasName>
      <ModelName>UNITCODE</ModelName>
      <FieldType>esriFieldTypeString</FieldType>
      <IsNullable>true</IsNullable>
      <Required>true</Required>
    </GPFieldInfoEx>
    <GPFieldInfoEx xsi:type="typens:GPFieldInfoEx">
      <Name>REGIONCODE</Name>
      <AliasName>REGIONCODE</AliasName>
      <ModelName>REGIONCODE</ModelName>
      <DomainName>DOM_REGIONCODE_NPS2016</DomainName>
      <FieldType>esriFieldTypeString</FieldType>
      <DefaultValueString>SER</DefaultValueString>
      <IsNullable>true</IsNullable>
      <Required>true</Required>
    </GPFieldInfoEx>
    <GPFieldInfoEx xsi:type="typens:GPFieldInfoEx">
      <Name>CREATEUSER</Name>
      <AliasName>CREATEUSER</AliasName>
      <ModelName>CREATEUSER</ModelName>
      <FieldType>esriFieldTypeString</FieldType>
      <DefaultValueString>GRSM User</DefaultValueString>
      <IsNullable>true</IsNullable>
      <Required>true</Required>
    </GPFieldInfoEx>
  </GPFieldInfoExs>
 </DEFeatureClassInfo>')

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这花费了我4个小时的谷歌搜索，并向我展示了数据库中至少有哪些表在XML模式定义中包含CREATEUSER。只需要触摸所有这些，并删除真正的。为了澄清，我不想删除true的其他实例。在上面发布的同一个示例中，我们看到UNITCODE节点中存在true，并且不能删除/删除true。我只想删除与CREATEUSER关联的true

请尝试以下操作

SQL

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请根据输入XML共享所需的输出。准确运行解决方案并针对生产运行，将导致真正更改为。我怎样才能把它也处理掉呢？我需要删除整个true…和…SET XmlCol.modify'delete/defectureclassinfo/GPFieldInfoExs/GPFieldInfoEx[Name=CREATEUSER]/Required[1]；我成功了！谢谢，你的例子给了我正确的方向！不清楚是需要1只删除元素的值，还是需要2完全删除整个元素。

<Required>true</Required>

<Required>true</Required>

<Name>CREATEUSER</Name>

SELECT *
FROM   GDB_ITEMS
WHERE  GDB_ITEMS.Definition.exist(N'//Name[text()="CREATEUSER"]') = 1;

-- DDL and sample data population, start
DECLARE @tbl TABLE (XmlCol XML)
INSERT INTO @tbl (XmlCol) VALUES 
(N'<DEFeatureClassInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                    xmlns:xs="http://www.w3.org/2001/XMLSchema"
                    xmlns:typens="http://www.esri.com/schemas/ArcGIS/10.8"
                    xsi:type="typens:DEFeatureClassInfo">
    <GPFieldInfoExs xsi:type="typens:ArrayOfGPFieldInfoEx">
        <GPFieldInfoEx xsi:type="typens:GPFieldInfoEx">
            <Name>UNITCODE</Name>
            <AliasName>UNITCODE</AliasName>
            <ModelName>UNITCODE</ModelName>
            <FieldType>esriFieldTypeString</FieldType>
            <IsNullable>true</IsNullable>
            <Required>true</Required>
        </GPFieldInfoEx>
        <GPFieldInfoEx xsi:type="typens:GPFieldInfoEx">
            <Name>REGIONCODE</Name>
            <AliasName>REGIONCODE</AliasName>
            <ModelName>REGIONCODE</ModelName>
            <DomainName>DOM_REGIONCODE_NPS2016</DomainName>
            <FieldType>esriFieldTypeString</FieldType>
            <DefaultValueString>SER</DefaultValueString>
            <IsNullable>true</IsNullable>
            <Required>true</Required>
        </GPFieldInfoEx>
        <GPFieldInfoEx xsi:type="typens:GPFieldInfoEx">
            <Name>CREATEUSER</Name>
            <AliasName>CREATEUSER</AliasName>
            <ModelName>CREATEUSER</ModelName>
            <FieldType>esriFieldTypeString</FieldType>
            <DefaultValueString>GRSM User</DefaultValueString>
            <IsNullable>true</IsNullable>
            <Required>true</Required>
        </GPFieldInfoEx>
    </GPFieldInfoExs>
</DEFeatureClassInfo>');
-- DDL and sample data population, end

-- before
SELECT * FROM @tbl;

DECLARE @NewValue VARCHAR(10) = '';

UPDATE @tbl
SET XmlCol.modify('replace value of 
(/DEFeatureClassInfo/GPFieldInfoExs/GPFieldInfoEx[Name="CREATEUSER"]/Required/text())[1] with (sql:variable("@NewValue"))');

-- after
SELECT * FROM @tbl;