Question

以下是我尝试从以下内容获取某些值的XML示例：

<ows:Operation name="DescribeFeatureType">
    <ows:Parameter name="outputFormat">
        <ows:Value>text/xml; subtype=gml/3.1.1</ows:Value>
    </ows:Parameter>
</ows:Operation>
<ows:Operation name="GetFeature">
    <ows:Parameter name="resultType">
        <ows:Value>results</ows:Value>
        <ows:Value>hits</ows:Value>
    </ows:Parameter>
    <ows:Parameter name="outputFormat">
        <ows:Value>text/xml; subtype=gml/3.1.1</ows:Value>
        <ows:Value>GML2</ows:Value>
        <ows:Value>GML2-GZIP</ows:Value>
        <ows:Value>SHAPE-ZIP</ows:Value>
        <ows:Value>csv</ows:Value>
        <ows:Value>gml3</ows:Value>
        <ows:Value>gml32</ows:Value>
        <ows:Value>json</ows:Value>
        <ows:Value>text/xml; subtype=gml/2.1.2</ows:Value>
        <ows:Value>text/xml; subtype=gml/3.2</ows:Value>
    </ows:Parameter>
</ows:Operation>

我想使用Oracle 10GR2中的XMLTABLE访问“GetFeature”操作的“outputFormat”参数值。

我尝试了各种各样的东西，但他们要么没有给我任何结果，要么全部。这是一个返回所有值的示例。

select t.*
        from xmltable(xmlnamespaces(default 'http://www.opengis.net/wfs'
                                   ,'http://www.opengis.net/gml' as "gml"
                                    ,'http://www.opengis.net/wfs' as "wfs"
                                    ,'http://www.opengis.net/ows' as "ows"
                                    ,'http://www.w3.org/1999/xlink' as "xlink"
                                    ,'http://www.w3.org/2001/XMLSchema-instance' as "xsi"
                                    ,'http://www.opengis.net/ogc' as "ogc")
                      ,'for $d in //ows:Operation/ows:Parameter/ows:Value
                        where //ows:Operation/@name = "GetFeature"
                        and //ows:Parameter/@name="outputFormat"
                        return $d' passing p_xml columns value varchar2(100) path '/') as t

非常感谢任何帮助。

Answer 1

找到答案：

select t.*
        from xmltable(xmlnamespaces(default 'http://www.opengis.net/wfs'
                                   ,'http://www.opengis.net/gml' as "gml"
                                    ,'http://www.opengis.net/wfs' as "wfs"
                                    ,'http://www.opengis.net/ows' as "ows"
                                    ,'http://www.w3.org/1999/xlink' as "xlink"
                                    ,'http://www.w3.org/2001/XMLSchema-instance' as "xsi"
                                    ,'http://www.opengis.net/ogc' as "ogc")
                      ,'for $d in //ows:Operation/ows:Parameter/ows:Value
                        where $d/../../@name = "GetFeature"
                        and $d/../@name="outputFormat"
                        return $d' passing p_xml columns value varchar2(100) path '/') as t;

使用.. xpath表达式访问父节点。

如何使用Oracle Xquery从XML中选择特定值

1 个答案: