Sql 在where子句中使用属性名从XML Clob提取数据

我们有一个名为

journalaarticle

的表，其中包含列

CONTENT

，其中XML数据存储为CLOB

<?xml version="1.0"?>
<root available-locales="en_US" default-locale="en_US">
    <dynamic-element name="group_html_title" type="text" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[Industrial AC Drives]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="group_image" type="document_library" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[/documents/20184/40787/Industrial-AC-Drives--Fan-and-Pump_Drives.png/8a1e761d-1cac-49aa-8212-fa3943204449?t=1437389273031]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="product_type" type="list" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[Drives]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="page_banner" type="list" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[a2cdb3ca-8872-4d08-a6ee-00b84495e0e0]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="access_groups" type="list" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="short_copy" type="text_area" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[<p>Drives that offer a broad range of control modes, features, options, and packaging, for use in factory automation processes and industrial OEM machines.&nbsp;<a href="javascript:void(0);" onclick="showDocumentsStaticPopup('eLM.J1000.01')" style="line-height: 1.5;">Test POPUP</a>&nbsp;<a href="javascript:void(0);" onclick="showDocumentsStaticPopup('eLM.J1000.01')" style="line-height: 1.5;">Test POPUP</a></p>]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="html_body" type="text_area" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="group_active" type="boolean" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[true]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="page_meta_description" type="text" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[Yaskawa's Family of AC Drives are designed for industrial automation applications. These adjustable frequency drives are typically capable of network communications, supported by software tools for parameter management and able to accept custom software]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="page_meta_keywords" type="text" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[Yaskawa, AC_drive, AC, VFD, industrial_automation, industrial_drives, variable_frequency_drive, AC_drives]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="business_weightage" type="ddm-number" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[5000]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="clickable_in_left_navigation" type="boolean" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[true]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="clickable_in_menu" type="boolean" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[true]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="visible_in_left_navigation" type="boolean" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[true]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="visible_in_menu" type="boolean" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[true]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="external_url" type="text" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[]]></dynamic-content>
    </dynamic-element>
    <dynamic-element name="shared_with_site" type="list" index-type="keyword" index="0">
        <dynamic-content language-id="en_US"><![CDATA[]]></dynamic-content>
    </dynamic-element>
</root>

驱动器提供广泛的控制模式、功能、选项和包装，用于工厂自动化过程和工业OEM机器
 ]]>
您可以使用XMLQuery或XMLTable：

select x.content
from journalarticle j
cross join xmltable ('/root/dynamic-element[@name="group_html_title"]'
  passing xmltype(j.content)
  columns content varchar2(4000) path 'dynamic-content'
) x;

CONTENT                                                                        
--------------------------------------------------------------------------------
Industrial AC Drives                                                            

XPath在
根目录下查找
动态元素
节点，并将其限制在属性具有
[@name=…]
节所需名称的节点上。然后，它从任何匹配元素节点下的
动态内容
节点中提取节点值


题目中提到了where子句。您可以使用XMLTable将所有数据提取到列中，然后根据其中一个进行筛选，也可以直接在where子句中使用XMLQuery：

select *
from journalarticle j
where xmlquery('for $i in /root/dynamic-element[@name="group_html_title"]
  where $i/dynamic-content = "Industrial AC Drives"
  return $i'
  passing xmltype(j.content) returning content) is not null;

或者将两者结合使用，只需使用XMLTable获取所需的数据，并使用XMLQuery首先筛选基表行。
请显示准确的样本数据和预期的输出。