獲取的XMLElement從Oracle XMLTABLE與命名空間

我的第一個問題，請原諒的錯誤....獲取的XMLElement從Oracle XMLTABLE與命名空間

我有這樣的XML，從銀行加拿大，平均每日匯率

<?xml version="1.0" encoding="UTF-8"?> 
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
      xmlns="http://purl.org/rss/1.0/" 
      xmlns:cb="http://www.cbwiki.net/wiki/index.php/Specification_1.1" 
      xmlns:dc="http://purl.org/dc/elements/1.1/"> 
    <channel rdf:about="http://www.bankofcanada.ca/valet/fx_rss/FXUSDCAD"> 
    <title>Daily exchange rates</title> 
    <link>http://www.bankofcanada.ca/?p=39898</link> 
    <description>Daily average exchange rates - published once each business day by 16:30 ET. All Bank of Canada exchange rates are indicative rates only.</description> 
    <items> 
     <rdf:Seq> 
     <rdf:li rdf:resource="http://www.bankofcanada.ca/valet/fx_rss/FXUSDCAD" /> 
     </rdf:Seq> 
    </items> 
    <dc:language>en</dc:language> 
    </channel> 
    <item rdf:about="http://www.bankofcanada.ca/valet/fx_rss/FXUSDCAD"> 
    <title>CA: 1.3475 CAD = 1 USD 2017-03-08</title> 
    <link>http://www.bankofcanada.ca/?p=39898</link> 
    <description>1 USD = 1.3475 CAD (US dollar to Canadian dollar daily exchange rate)</description> 
    <dc:date>2017-03-08T21:30:00Z</dc:date> 
    <dc:language>en</dc:language> 
    <cb:statistics> 
     <cb:country>CA</cb:country> 
     <cb:exchangeRate> 
     <cb:value decimals="4">1.3475</cb:value> 
     <cb:baseCurrency>CAD</cb:baseCurrency> 
     <cb:targetCurrency>USD</cb:targetCurrency> 
     <cb:rateType>Bank of Canada exchange rate</cb:rateType> 
     <cb:observationPeriod frequency="daily">2017-03-08T21:30:00Z</cb:observationPeriod> 
     </cb:exchangeRate> 
    </cb:statistics> 
    </item> 
</rdf:RDF>

而且我有這個Oracle PL/Sql獲取一些值，它返回一行，但它不返回任何數據。所有列都是空白或空的，我錯過了一些東西，但我不確定是什麼？我在Oracle 11g數據庫中運行它。

with xml_data AS 
(select xmltype(
'<?xml version="1.0" encoding="UTF-8"?> 
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
      xmlns="http://purl.org/rss/1.0/" 
      xmlns:cb="http://www.cbwiki.net/wiki/index.php/Specification_1.1" 
      xmlns:dc="http://purl.org/dc/elements/1.1/"> 
    <channel rdf:about="http://www.bankofcanada.ca/valet/fx_rss/FXUSDCAD"> 
    <title>Daily exchange rates</title> 
    <link>http://www.bankofcanada.ca/?p=39898</link> 
    <description>Daily average exchange rates - published once each business day by 16:30 ET. All Bank of Canada exchange rates are indicative rates only.</description> 
    <items> 
     <rdf:Seq> 
     <rdf:li rdf:resource="http://www.bankofcanada.ca/valet/fx_rss/FXUSDCAD" /> 
     </rdf:Seq> 
    </items> 
    <dc:language>en</dc:language> 
    </channel> 
    <item rdf:about="http://www.bankofcanada.ca/valet/fx_rss/FXUSDCAD"> 
    <title>CA: 1.3475 CAD = 1 USD 2017-03-08</title> 
    <link>http://www.bankofcanada.ca/?p=39898</link> 
    <description>1 USD = 1.3475 CAD (US dollar to Canadian dollar daily exchange rate)</description> 
    <dc:date>2017-03-08T21:30:00Z</dc:date> 
    <dc:language>en</dc:language> 
    <cb:statistics> 
     <cb:country>CA</cb:country> 
     <cb:exchangeRate> 
     <cb:value decimals="4">1.3475</cb:value> 
     <cb:baseCurrency>CAD</cb:baseCurrency> 
     <cb:targetCurrency>USD</cb:targetCurrency> 
     <cb:rateType>Bank of Canada exchange rate</cb:rateType> 
     <cb:observationPeriod frequency="daily">2017-03-08T21:30:00Z</cb:observationPeriod> 
     </cb:exchangeRate> 
    </cb:statistics> 
    </item> 
</rdf:RDF>' 
) xmlcol from dual 
) 
SELECT length(x1.xmlcol) as x_len, x2.title 
from xml_data x1, 
     XMLTABLE (
     XMLNAMESPACES (
      'http://www.w3.org/1999/02/22-rdf-syntax-ns#'   AS "rdf", 
      'http://www.cbwiki.net/wiki/index.php/Specification_1.1' AS "cb", 
      'http://purl.org/dc/elements/1.1/'      AS "dc"), 
     '/rdf:RDF' 
     PASSING x1.XMLCOL 
     COLUMNS 
      title VARCHAR2 (1024) PATH '/channel/title' 
     ) x2

來源

2017-03-09 vs_coder

我的XMLTable聲明失蹤 '默認' 的命名空間PARM，注意

默認 'http://purl.org/rss/1.0/'，

在XMLNAMESPACES區域

...

SELECT length(x1.xmlcol) as x_len, x2.* 
from xml_data x1, 
     XMLTABLE (
     XMLNAMESPACES 
     ( default 'http://purl.org/rss/1.0/', 
      'http://www.w3.org/1999/02/22-rdf-syntax-ns#'    AS "rdf", 
      'http://www.cbwiki.net/wiki/index.php/Specification_1.1' AS "cb", 
      'http://purl.org/dc/elements/1.1/'      AS "dc" 
     ), 
     '/rdf:RDF/item/cb:statistics/cb:exchangeRate' 
     PASSING x1.XMLCOL 
     COLUMNS 
      title    VARCHAR2 (1024) PATH 'cb:value', 
      observationPeriod VARCHAR2 (1024) PATH 'cb:observationPeriod' 
     ) x2

來源

2017-03-09 20:35:26

獲取的XMLElement從Oracle XMLTABLE與命名空間

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