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	<title>Mohammed CHERIFI &#187; webservice</title>
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		<title>Introduction à Yahoo! Query Language (YQL)</title>
		<link>http://www.mcherifi.org/developpement-web/yql-yahoo-query-language.html</link>
		<comments>http://www.mcherifi.org/developpement-web/yql-yahoo-query-language.html#comments</comments>
		<pubDate>Tue, 28 Jul 2009 17:31:24 +0000</pubDate>
		<dc:creator>Mohammed CHERIFI</dc:creator>
				<category><![CDATA[Développement WEB]]></category>
		<category><![CDATA[api]]></category>
		<category><![CDATA[webservice]]></category>
		<category><![CDATA[yahoo query language]]></category>
		<category><![CDATA[yql]]></category>

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		<description><![CDATA[Yahoo! Query Language, baptisé YQL est un nouveau langage développé par Yahoo, semblable à SQL, ce dernier permet d'effectuer des requêtes ordonner, filtrer et combiner des données en provenance de tout le réseau internet et "Web Services" ! Ces informations sont récupérées sous format XML ou JSON !

En effet,  pour développer une application qui utilise un WEB service, les développeurs sont souvent amenés à reconnaitre les bons URL d'APIs et recourir à la documentation pour faire appel à chacun de ces derniers , sans oublier de rester prévisible à une future modification de ces derniers,  d'où l'intérêt de YML ;)]]></description>
			<content:encoded><![CDATA[<a href="http://twitter.com/share" class="twitter-share-button" data-url="http://www.mcherifi.org/developpement-web/yql-yahoo-query-language.html" data-text="Introduction à Yahoo! Query Language (YQL)" data-count="horizontal">Tweet</a><div id="attachment_55" class="wp-caption alignleft" style="width: 138px"><img class="size-full wp-image-55" title="yql128" src="http://www.mcherifi.org/wp-content/uploads/2009/07/yql128.gif" alt="Yahoo! Query Language" width="128" height="128" /><p class="wp-caption-text">Yahoo! Query Language</p></div>
<p>Yahoo! Query Language, baptisé YQL est un nouveau langage développé par Yahoo, semblable à SQL, ce dernier permet d&#8217;effectuer des requêtes, ordonner, filtrer et combiner des données en provenance de tout le réseau internet et &laquo;&nbsp;Web Services&nbsp;&raquo; ! Ces informations sont récupérées sous format XML ou JSON !</p>
<p>En effet,  pour développer une application qui utilise un WEB service, les développeurs sont souvent amenés à reconnaitre les bons URL d&#8217;APIs et recourir à la documentation pour faire appel à chacun de ces derniers , sans oublier de rester prévisible à une future modification de ces derniers,  d&#8217;où l&#8217;intérêt de YQL ;)</p>
<p>L&#8217;idée derrière la création de ce nouveau langage est de faciliter aux développeurs l&#8217;accès aux services web, ainsi ils peuvent accéder et récupérer facilement les données  via un seul langage sans se référer aux différents APIs, notre ami Yahoo s&#8217;occupera des mises à jours si il y en aura!</p>
<p>Les fichiers de base de données YQL sont en fait de gros fichiers XML qu&#8217;on peut interroger facilement via une seule ligne, et comme c&#8217;est ouvert tout utilisateur peut proposer sa base YQL!</p>
<p>J&#8217;ai eu le temps de faire un tour sur le site de YQL, et ce que je trouve avantageux dans ce nouveau langage est sa facilité d&#8217;utilisation du fait qu&#8217;il est basé sur des instructions similaires à SQL comme SELECT, DESC, SHOW..</p>
<p><strong>Quelques exemples de commande YQL:</strong></p>
<p>Récupérer les informations géographiques de la ville de Rabat (Maroc):</p>
<pre class="brush: sql">select * from geo.places where text=&quot;Rabat&quot;</pre>
<p>Récupérer les références des photos sur flickr contant le text &laquo;&nbsp;Maroc&nbsp;&raquo;</p>
<pre class="brush: sql">select * from flickr.photos.search where has_geo=&quot;true&quot; and text=&quot;Maroc&quot;</pre>
<p>Pour interroger une base YQL externe il suffit de l&#8217;appeler avec la command <strong>use</strong> !</p>
<p>Exemple pour récupérer les derniers twitts de mcherifi:</p>
<pre class="brush: sql">use &#039;http://github.com/spullara/yql-tables/raw/a2f518a10ccdca99658f14bee9101b77d7b4cf08/twitter/twitter.user.status.xml&#039; as twittertable;
select * from twittertable where id=&#039;mcherifi&#039;;</pre>
<p>On définit la source de la base YQL distance avec la commande &laquo;&nbsp;use&nbsp;&raquo;, on donne un alias à cette dernière grâce à &laquo;&nbsp;AS&nbsp;&raquo; et on effectue notre sélection, à noter que le nom des champs n&#8217;est pas toujours le même et on peut le connaitre avec la commande : DESC nom_table</p>
<p>Il est également possible de faire des jointures et utiliser des sous requêtes, par exemple cette requête recherche tous les événements depuis Yahoo Events dont le texte contient &laquo;&nbsp;Morocco&nbsp;&raquo;</p>
<pre class="brush: sql">select name,start_date from upcoming.events where woeid in (select woeid from geo.places where text=&quot;Morocco&quot;) | sort(field=&quot;start_date&quot;)</pre>
<p>Yahoo a également introduit les commandes de manipulation de données (INSERT/UPDATE/DELETE) que je détaillerai dans un prochain billet.</p>
<p>Vous pouvez vous amuser à découvrir ce nouveau langage en vous rendant sur la console YQL sur cette adresse : http://developer.yahoo.com/yql/console/</p>
<p>Je vous invite également à visiter <a href="http://developer.yahoo.com/yql/console/">le site de YQL</a>, qui est à mon avis un projet prometteur qui fera évoluer le web!</p>



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