使用 PL/SQL 解析 SOAP 响应

Question

我正在尝试使用以下代码解析 SOAP 响应，但我得到一个空响应。响应包含多个名称空间，我认为这就是我遇到问题的地方。有人能指出我做错了什么吗？

declare
  l_xml  xmltype;
begin
  l_xml := xmltype.createXML('<?xml version="1.0" encoding="UTF-8"?>
                <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://www.cachelan.com/WebAPI/solarvuDataRetrieve.php" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns2="http://xml.apache.org/xml-soap" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
                <SOAP-ENV:Body>
                    <ns1:getDataResponse>
                        <return xsi:type="ns2:Map">
                            <item>
                                <key xsi:type="xsd:string">status</key>
                                <value xsi:type="xsd:int">0</value>
                            </item>
                            <item>
                                <key xsi:type="xsd:string">content</key>
                                <value xsi:type="xsd:string">"SolarVu OM Data Request"
                                "From Mar 1, 2017 To Mar 4, 2017"

                                "Timestamp","Date","Daily Energy(kWh)","Insolation(Wh/m^2)"
                                "1488344400","Mar 1/17","131.064","1,105.750"
                                "1488430800","Mar 2/17","370.576","3,202.750"
                                "1488517200","Mar 3/17","517.566","4,662.500"
                                "1488603600","Mar 4/17","382.626","6,001.750"
                            </value>
                        </item>
                    </return>
                </ns1:getDataResponse>
                </SOAP-ENV:Body>
                </SOAP-ENV:Envelope>');

  for i in (SELECT t."key", t."value"
            FROM dual d,
            XMLTABLE(xmlnamespaces('http://www.w3.org/2001/XMLSchema-instance' as "xsi",
                                   'http://schemas.xmlsoap.org/soap/envelope/' as "SOAP-ENV",
                                   'http://www.cachelan.com/WebAPI/solarvuDataRetrieve.php' as "ns1",
                                   'http://www.w3.org/2001/XMLSchema' as "xsd",
                                   'http://xml.apache.org/xml-soap' as "ns2",
                                   'http://schemas.xmlsoap.org/soap/encoding/' as "SOAP-ENC"), 
                    '/getDataResponse/return/item[*]'
              PASSING l_xml
              COLUMNS 
                 "key"   varchar2(4000) PATH 'key',
                 "value" varchar2(4000) PATH 'value') t)
  loop
    dbms_output.put_line('Key is: '||i."key");
  end loop;
end;
/

Answer 1

我有同样的问题。我发现问题出在 <ns1:getDataResponse> 之类的前缀命名空间中，以及 Oracle XMLType 如何解释它们。根据您的示例，我解决了提取没有前缀命名空间的内部节点的问题。

declare
   l_xml xmltype;
begin
   l_xml := xmltype.createXML('<?xml version="1.0" encoding="UTF-8"?>
                <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://www.cachelan.com/WebAPI/solarvuDataRetrieve.php" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns2="http://xml.apache.org/xml-soap" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
                <SOAP-ENV:Body>
                    <ns1:getDataResponse>
                        <return xsi:type="ns2:Map">
                            <item>
                                <key xsi:type="xsd:string">status</key>
                                <value xsi:type="xsd:int">0</value>
                            </item>
                            <item>
                                <key xsi:type="xsd:string">content</key>
                                <value xsi:type="xsd:string">"SolarVu OM Data Request"
                                "From Mar 1, 2017 To Mar 4, 2017"

                                "Timestamp","Date","Daily Energy(kWh)","Insolation(Wh/m^2)"
                                "1488344400","Mar 1/17","131.064","1,105.750"
                                "1488430800","Mar 2/17","370.576","3,202.750"
                                "1488517200","Mar 3/17","517.566","4,662.500"
                                "1488603600","Mar 4/17","382.626","6,001.750"
                            </value>
                        </item>
                    </return>
                </ns1:getDataResponse>
                </SOAP-ENV:Body>
                </SOAP-ENV:Envelope>');

   --Pay attention here and changes in path parameter at XMLTABLE
   l_xml := l_xml.EXtract('//*/*//return');

   for i in (select t.key, t.value
               from dual d,
                    XMLTABLE('/return/item' PASSING l_xml COLUMNS key
                               varchar2(4000) PATH 'key',
                              value varchar2(4000) PATH 'value') t) loop
      dbms_output.put_line('Key is: ' || i.key);
   end loop;
end;

Answer 2

您没有在 XPath 中为其命名空间添加 getDataResponse 前缀，也没有包含信封和正文标记；所以将 XPath 更改为：

'/SOAP-ENV:Envelope/SOAP-ENV:Body/ns1:getDataResponse/return/item'

只需更改您的代码即可生成：

Key is: status
Key is: content

PL/SQL procedure successfully completed.