创建一个YQL Opentable以将RSS数据与Placemaker Map info结合起来

问题描述

|| 我正在尝试从RSS提要中检索数据（此部分成功），然后使用描述，标题和标题使用YQL Placemaker开放数据表获取地理信息（纬度，经度，woeId）。 所有这些都需要作为JSON输出。 这里是在YQL控制台中对其进行测试的固定链接。 任何想法，我的xml代码有什么问题，或者我应该尝试什么？     

   <meta>
    <author>Yahoo! Inc.</author>
    <documentationURL>http://i-magine.mobi/</documentationURL>
    <sampleQuery>select * from {table} where section=\"topstories\" and description matches \".*jpg.*\"</sampleQuery>
    <description>Searches Yahoo.news RSS</description>
  </meta>


 <bindings>
    <select itemPath=\"\" produces=\"XML\">
      <urls>
        <url>http://rss.news.yahoo.com/rss/topstories/{section}
        </url>
      </urls>
      <inputs>
        <key id=\'section\' type=\"xs:string\" paramType=\"path\" required=\"true\" />
      </inputs>


      <execute><![CDATA[
        default xml namespace = \"http://where.yahooapis.com/v1/schema.rng\";

        // http://www.json.org/json2.js
                y.include(\'http://www.i-magine.mobi/json2.js\');

        rssStorySection = [];

         rssStoryNumber = [];
         rssStoryTitle = [];
         rssStorySummary = [];
         rssImageCaption = [];
         rssStoryUrl = [];
         rssImageUrl = [];

         rssGeoText = []; 

//  var content = \'They followed him to deepest Africa after Brussels and Tokyo and found him there in Timbuktu\';       

        var rssQuery = \'select * from rss where url = \' + \"\'\" + \'http://rss.news.yahoo.com/rss/\' + section + \"\'\" + \' and description matches \".*jpg.*\" limit 30\';


      res1 = y.query(rssQuery);
      data1 = res1.results;


//    var geoQuery = \'SELECT * FROM geo.placemaker WHERE documentContent =\' + \'\"\' + content + \'\"\' + \'AND documentType=\' + \'\"\' +  \'text/plain\' + \'\"\';


//    res2 = y.query(geoQuery);
//    data2 =  res2.results;



      for (var c=0;c<data1.item.length;c++)
    {
        var story = data1.item[c];

            var storyTitleText0 = story.title + \"\"; 

        var storyUrl = story.link + \"\";

        var description = story.description;

        var storyTitleText = storyTitleText0.replace(/\\n/ig,\"\") + \"\";  

        var imageUrl = description.match(/http:\\/\\/d.*?jpg/i) + \"\";

            var imageCaptionText0 = description.match(/alt=\"([^ ]).*border/) + \"\";
            var imageCaptionText1 = imageCaptionText0.replace(/alt=\"/ig,\"\") + \"\";
        var imageCaptionText = imageCaptionText1.replace(/\" border.*/ig,\"\") + \"\";

        var storySummaryText = description.replace(/<[^>]*>([\\s]?)*<[^>]*>/g,\"\") + \"\"; 

            var storySection0 = description.match(/http[^ ].*\\*/i) + \"\";        
            var storySection1 = storySection0.replace(/\\/\\*/ig,\"\") + \"\";       
        var storySection = storySection1.replace(/http:\\/\\/us.rd.yahoo.com\\/dailynews\\/rss\\//ig,\"\") + \"\";  

        var geoString = (imageCaptionText + \" \" + storyTitleText + \" \" + storySummaryText);

        rssStorySection.push(storySection);
        rssStoryTitle.push(storyTitleText);
        rssStorySummary.push(storySummaryText);
        rssImageCaption.push(imageCaptionText);     
        rssStoryUrl.push(storyUrl);
        rssImageUrl.push(imageUrl);
        rssGeoText.push(geoString);
        rssStoryNumber.push(c);

    var content = geoString;

    var geoQuery = \'SELECT * FROM geo.placemaker WHERE documentContent =\' + \'\"\' + content + \'\"\' + \'AND documentType=\' + \'\"\' +  \'text/plain\' + \'\"\';


     var res2 = y.query(geoQuery);
     var data2 =  res2.results;     

              }


        var d = data1;
        var e = data2;

                    response.object = <stories>
                                <c>{section}</c>
                                <d>{d}</d>
                                <e>{e}</e>          
                      </stories>;



           ]]></execute>



    </select>
  </bindings>
</table>

    

解决方法

        整理过的表格（从“ RSS + Placemaker结果”的意义上讲，也是“有效的”）看起来像这样：

<?xml version=\"1.0\" encoding=\"UTF-8\" ?>
<table xmlns=\"http://query.yahooapis.com/v1/schema/table.xsd\">
   <meta>
    <author>Peter Cowburn</author>
    <documentationURL>http://stackoverflow.com/questions/6168564/creating-a-yql-opentable-to-combine-rss-data-with-placemaker-map-info</documentationURL>
    <sampleQuery>select * from {table} where section=\'topstories\'</sampleQuery>
    <description>Searches Yahoo! News RSS and injects Placemaker Places</description>
  </meta>
  <bindings>
    <select itemPath=\"stories.story\" produces=\"XML\">
      <urls>
        <url>
            http://rss.news.yahoo.com/rss/{section}
        </url>
      </urls>
      <inputs>
        <key id=\"section\" type=\"xs:string\" paramType=\"path\" required=\"true\" />
      </inputs>
      <execute><![CDATA[

// Fetch top 30 feed items with jpg images
var feed = y.query(
  \'select * from rss where url=@url and description matches \".*jpg.*\" limit 30\',{url: request.url}
).results;

// Build geo queries
var placeQuery = \'select * from geo.placemaker where documentContent=@text and documentType=\"text/plain\"\';
var placeQueries = [];
var title,description,caption,summary,content;
for each (result in feed.item) {
  title       = result.title.text().toString();
  description = y.tidy(result.description.toString()).body.p;
  caption     = [e-mail]();
  summary     = description..*.text().toString();
  content     = caption + \" \" + title + \" \" + summary;
  placeQueries.push({
    query:   y.query(placeQuery,{text: content}),item:    result,results: null
  });
}

// Execute all queries
var where = new Namespace(\'http://wherein.yahooapis.com/v1/schema\');
var matches,match,places = [];
for (var q in placeQueries) {
  matches = placeQueries[q].query.results.matches.match;
  placeQueries[q].results = matches..where::place;
}

// Build response object
var stories = <stories/>;
for each (q in placeQueries) {
  stories.node += <story>
    {q.item}
    {q.results}
  </story>;
}

response.object = stories;

      ]]></execute>
    </select>
  </bindings>
</table>

您可以通过在查询中在线指向表（它可能不会永远存在！）来使用它：

use \'https://raw.github.com/salathe/yql-tables/so-6168564/yahoo/newswithplaces.xml\'
as rssplaces;
select * from rssplaces where section=\'topstories\';

（在YQL控制台中尝试） 该表使用了

<execute>

块中可用的一些功能，例如E4X，查询参数和并行查询，这些功能都使生活更轻松，但乍一看可能有些陌生。 附言上面的内容是按原样提供的，我不会在这方面向后屈服于“支持”问题。它主要是为了让您动起来，它是一种可能对您有用的方法的介绍。