YQL Open Hackday NYC talk

Yahoo Query Language
select * from internet

Jonathan Trevor (jtrevor@yahoo-inc.com) @jonathantrevor

data manipulation
Application =

data manipulation
Application = +
data visualization

var map = new
YMap(document.getElementById('map'));
…
dev var currentGeoPoint = new
YGeoPoint( _c.Lat, _c.Lon );
map.addMarker(currentGeoPoint);
…

var map = new
…
…

…
if (flickcurl_prepare(fc,
"flickr.photos.geo.correctLocation",
parameters, count)) { … }
…

var map = new
…
…

…
…

http://search.yahooapis.com/
ImageSearchService/V1/imageSearch?
appid=YahooDemo&query=Corvette&results=2

var map = new
…
…

…
…


http://weather.yahooapis.com/
forecastrss?p=FRXX0076&u=c

var map = new
…

?
…

…

?
…

? http://search.yahooapis.com/

?
http://weather.yahooapis.com/

Yahoo! My Yahoo! Mail Welcome, guest Sign In

Search

MY PROJECTS APIs & WEB SERVICES var map = new
RESOURCES SUPPORT

YDN Maps Suite AJAX Maps YMap(document.getElementById('map'));
Yahoo! Maps Web Services - AJAX API Getting … READY TO GET STARTED?
You aren't signed in Sign In Help

Started Guide var currentGeoPoint = newGet an App ID
dev Home The Tour Sign Up Explore Search
Learn the fundamentals of the Yahoo! Maps AJAX API and start creating your own maps. This page contains:

Introduction and Prerequisites
Yahoo! Maps Cheatsheets
Examples Flickr Services Yahoo! My Yahoo! Mail RECENT BLOG ARTICLES Welcome, guest Sign In

API Documentation Feeds Your API Keys map.addMarker(currentGeoPoint);
Display a Yahoo! Map

?
Apply for a new API Key
Add controls to your Yahoo! Map Leonardo da Vinci: Hacker Search
Add a logger to a Yahoo! Map
Place a marker on a Yahoo! Map … MY PROJECTS
January 24, 2009

APIs & WEB SERVICES RESOURCES SUPPORT
Draw Polylines on a Yahoo! Map Whaddyathink? & the Yahoo! Application
flickr.places.getPlaceTypes
Place Smart Markers on a Yahoo! Map
Add multiple custom markers on Yahoo! Map
YDN Weather RSS Feed
Platform
January 22, 2009
Traffic information overlay
Yahoo! Pipes RSS output information overlay Yahoo! Weather RSS Feed Making the new Yahoo! Currency Converter
Yahoo! My Yahoo! Mail Welcome, guest Sign In
Local search results overlay
Fetches a list of available place types for Flickr.
Yahoo! Pipes JSON output information overlay
YMap accessible
The Weather RSS feed enables you
Januaryto get up-to-date weather information for your location. You can save this
21, 2009
Overlay GeoRSS XML data
Overlay custom objects at YGeoPoint location
…
feed in My Yahoo! or your favorite feed aggregator, or incorporate the RSS data into your own web site or client
Search

application. The Weather RSSRetrievingdynamically-generatedfrom based on zip code or Location ID.
feed is a and displaying data feed
Authentication
Overlay custom objects at YCoordPoint location
Overlay polyline on Yahoo! Map if (flickcurl_prepare(fc,
Wikipedia with YQL PROJECTS
MY APIs & WEB SERVICES RESOURCES
This page describes the format of the 18, 2009 URL and the RSS response for developers. It contains these
January request
SUPPORT

?
Export Yahoo! Map in GeoRSS format YDN Image Search Documentation for Yahoo! Search Web Services
This method does not require authentication.
GeoRSS overlay with polyline
sections:
Get zoom level given radius from center
Custom position of controls Arguments RSS Request Image Search Documentation for Yahoo! Search READY TO GET STARTED?

Change Marker Images Dynamically
Use YMapTypeControl to position map types
Summary
Request Parameters
By applying for an Application ID for this service, you
hereby agree to the Terms of Use

Submitting Image Queries
Rate Limit
api_key (Required)
Other Features of the Yahoo! Maps AJAX API
…
RSS Response
YEvent, YGeoRSS, YMarker
Your API application key. See here for moreTop-Level Elements
details. The Image Search Web Service allows you to search the Internet for images.
Get an App ID
Terms of Service Channel Elements
Support & Community
Image Elements

?
Example Response Item Elements
Download all of the cheatsheets and example code in the Yahoo Request URL
Maps API Reference Bundle. Condition Codes YAHOO! GROUPS DISCUSSIONS view all
<place_types> Examples http://search.yahooapis.com/ImageSearchService/V1/imageSearch
For detailed descriptions of the classes and methods in the API, place_type_id="22">neighbourhood</place_type>
<place_type yahoo local search code in php
Terms of Use
Tue, 27 Jan 2009
check out v3.8 Reference Manual. <place_type place_type_id="7">locality</place_type>
<place_type
<place_type
place_type_id="9">county</place_type>
RSS Request
place_type_id="8">region</place_type>
Remaining, Supporting Classes
Request parameters My Web Search API shut down
See information on constructing REST queries announcement

Introduction and
<place_type
Prerequisites
<place_type
place_type_id="12">country</place_type>
The Weather RSS feed request follows simple HTTP GET syntax: start with a base URL and then add
place_type_id="29">continent</place_type> (?). Multiple parameters are separated by an ampersand (&).
parameters and values after a question mark
Wed, 21 Jan 2009
Parameter Value Description
</place_types>
The Yahoo! AJAX Maps API lets developers add maps to their web sites using DHTML and JavaScript®. the Weather RSS feed is
The base URL for Maps
appid string (required) The application ID. See Application IDs for more information.
Re: Site Explorer API returns 999 Rate Limit
Exceeded
are fully embeddable and scriptable using the JavaScript programming language. Yahoo! Maps AS-Flash API's query string (required) The query to search for. Use + to include terms, - to exclude terms, and

?
Wed, 21 Jan 2009
Error Codes
built-in geocoder means that you can specify a physical address or latitude/longitude coordinates for your map's
http://weather.yahooapis.com/forecastrss put quotes around "exact phrase".
location, as you like. type all (default), any, or The kind of search to submit: Reminder: Old obsolete versions of Local
In this section, Summary shows how to make an RSS request with different parameters; Request Parameters
phrase Search (V1, V2) shutting do
In order to create and test applications 100: Yahoo! Maps AJAX API, you'll need to use a supported summarizing those parameters.
using Invalid API Key shows a table web all returns results with all query terms. Mon, 19 Jan 2009
The API key passed was not valid or has expired.
browser: Firefox 2, Internet Explorer 6 or 7, Opera 9 or Safari 3. Newer versions of these browsers are also any returns results with one or more of the query terms.
supported. You can code your JavaScript applications usingcurrently unavailable
105: Service your favorite text editor or IDE. phrase returns results containing the query terms as a phrase.
SUMMARY results integer: default 10, The number of results to return.
The requested service is temporarily unavailable.
An application ID is required to use the Yahoo! Maps AJAX API. You can get an application ID here. max 50
The Weather RSS feed request follows simple HTTP GET syntax: start with a base URL and then add
111: Format "xxx" not found
start integer: default 1
parameters and values after a question mark (?). Multiple parameters are separated by an starting result position to return (1-based). The finishing position (start
The ampersand (&). For
For best results, you should launch your web pagesrequested response format was not found. applications
The from a web server. However, it's possible to run + results - 1) cannot exceed 1000.
the Weather RSS feed there are two parameters:
directly from your hard drive by double-clickingMethod This can be donefound
112: on them. "xxx" not by lowering the security settings in format any (default), bmp, Specifies the kind of image file to search for.
the Internet Explorer browser or by setting the The requested method was not found. p for location.
UniversalBrowserRead property in Firefox. gif, jpeg, png
u for degrees units (Fahrenheit or Celsius). adult_ok
114: Invalid SOAP envelope
http://weather.yahooapis.com/ no value or 1 The service filters out adult content by default. Enter a 1 to allow adult
content.
The SOAP envelope send in the requestlocationnot be parsed. required. Use this parameter to indicate the location for the weather forecast as a
The could parameter p is
Displaying a Yahoo! Map zip code or Location ID. coloration any (default), color, The service returns only the images of the coloration specified (color or
115: Invalid XML-RPC Method Call
All the API classes and methods necessary to interact with Yahoo! Mapsdocument couldyour application when
The XML-RPC request are availablehttp://weather.yahooapis.com/forecastrss?p=location
to not be parsed.
bw black-and-white).
site string: default no A domain to restrict your searches to (e.g. www.yahoo.com). You may
you include Yahoo! Maps AJAX API library in your web page.This example uses the demonstration application
value submit up to 30 values (site=www.yahoo.com&site=www.cnn.com).
ID "YD-eQRpTl0_JX2E95l_xAFs5UwZUlNQhhn7lj1H"; you cannot use this Application Forand must requestweather for Yahoo! Headquarters in Sunnyvale, CA, use the zip
ID example, to get one code for Sunnyvale
here. API Explorer (94089):
output string: xml The format for the output. If json is requested, the results will be returned
(default), json, php in JSON format. If php is requested, the results will be returned in
Serialized PHP format.
<html> API Explorer : flickr.places.getPlaceTypes
http://weather.yahooapis.com/forecastrss?p=94089
<head> callback string The name of the callback function to wrap around the JSON data. The
<b><script type="text/javascript" Or use the Location ID for Sunnyvale (USCA1116): following characters are allowed: A-Z a-z 0-9 . [] and _. If output=json has
src="http://api.maps.yahoo.com/ajaxymap?v=3.8&appid=YD- not been requested, this parameter has no effect. More information on the

dev

Bindings

YQL stmt
YQL

dev

Bindings

YQL stmt
YQL
select

dev

Bindings

YQL stmt
YQL
select
desc

dev

Bindings

YQL stmt
YQL
select
desc
show

Why YQL?
Thousands of Web Services and sources that
provide valuable data
Require Developers to read documentation and form
URLs/queries.
Data is isolated
Needs ﬁltering, combining, tweaking, shaping
even after it gets to the developer.

YQL
Hosted web service and SQL-Like Language
Familiar to developers
Synonymous with Data access
Expressive enough to get the right data.
Self describing - show, desc table
Allows you to query, ﬁlter, join and update data
across any structured data on the web / web services
Real time engine

YQL Statement Basics
show: lists the supported tables
desc: describes the structure of a table
select: fetches data
insert/update/delete: modify data
use: use an Open Data Table

show tables
desc social.contacts

YQL Select Statement

SELECT what
FROM collection
WHERE filter condition
IN (sub-select)
LIMIT n OFFSET n

Demo:
developer.yahoo.com/yql/

Get any data:
open data tables

Open Data Tables
Bindings

YQL

Open Data Tables

Map YQL to Endpoint

YQL

USE Verb
use ‘http://url-to-def.xml’ as tableName;
select * from tableName where key=‘value’...

Imports the Open Data Table deﬁnition
Makes it available as tableName
Acts just like other YQL Tables
Open tables can be collected together into
environment ﬁles

Open Developer Community

leveraging the work of others
github repository:
http://github.com/yql/yql-tables/tree/master
datatables.org mirrors the master and builds a single
environment with all tables (faster serving)
http://developer.yahoo.com/yql/console/?env=http://
datatables.org/alltables.env

Insert / Update / Delete
With INSERT / UPDATE / DELETE SQL verbs you
can modify data on the internet
create tweets, add blog entries, update DBs etc
Some tables with I/U/D
Twitter Status, Bit.ly shortener
Yahoo proﬁle status, application update stream
Amazon SimpleDB

Part 2:
Building your own open
data tables

Open Data Tables

Brings the power of the table model to new APIs
Schema deﬁnes mapping between YQL and
Endpoint
Keys can either be query, path or matrix parameters
Keys can be marked as required
YQL Compiler validates existence of required keys

YQL <execute>
extends Open Data Tables with server-side code
access APIs that require authentication
Netflix OAuth, FlickrAuth, Google AuthSub
join data across services
grab New York Times article tags and generate find
associated flickr photos
combine multiple searches into a single result: twitter,
web, news and image

YQL <execute>

augment data:
city/state to APIs that just return zip code
create APIs from web page
celebrity birthdays scraped from imdb, caltrain
data transformation
convert the result from xml to Google's kml format
move business logic of your application to the cloud

<execute> element
Javascript server-side scripting
No DOM, events etc, pure JS scripting
E4X support - XML literals, ﬁltering ...
YQL no longer performs a GET request to the table
binding URL
YQL provides additional useful global objects
request, response, y.rest, y.include, y.query...
execute tag must return the data that will be the
output of the YQL select

hello world
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta>
<sampleQuery>select * from {table} where a='cat' and b='dog';</sampleQuery>
</meta>
<bindings>
<select itemPath="" produces="XML">
<urls><url>http://fake.url/{a}</url></urls>
<inputs>
<key id='a' type='xs:string' paramType='path' required="true" />
<key id='b' type='xs:string' paramType='variable' required="true" />
</inputs>
<execute><![CDATA[
// Your javascript goes here. We will run it on our servers
response.object = <item>
<url>{request.url}</url>
<a>{a}</a>
<b>{b}</b>
</item>;
]]></execute>
</select>
</bindings>
</table>

Scraping a page
<select produces="XML" itemPath="deals.deal">
<urls><url>http://deals.yahoo.com</url></urls>
<execute><![CDATA[
var dealhtml = y.query("select * from html where url='http://deals.yahoo.com' and xpath='//
div[contains(@class, "product-display")]'").results;
var deals = <deals/>;
function compress(object) {
if (!object) return "";
return object.toString().replace(/s+/, " ")
}
for each (var div in dealhtml.div) {
var deal = <deal/>;
deal.name += <name>{compress(div.h3.a.text())}</name>;
deal.link += <link>{div.div[0].a.@href}</link>;
…
deal.description += <description>{compress(div.p[0].*)}</description>;
deal.logo += <logo>{compress(div.div[1].*)}</logo>;
deals.deal += deal;
}
response.object = deals;
]]></execute>
</select>

Inner join (uniﬁed web+image search)
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<bindings>
<select itemPath="results.result" produces="XML">
<inputs>
<key id="query" type="xs:string" paramType="query" required="true"/>
</inputs>
<execute><![CDATA[
var qs = query;
var search = y.query('select * from search.web(50) where query=@query', {query: qs}).results;
var images = [];
default xml namespace='http://www.inktomi.com/';
for each (var result in search.result) {
images.push(y.query('select * from search.images(1) where query=@query and url=@url',
{url:result.url, query:qs}));
}
var i = 0;
for each (var result in search.result) {
var image = images[i++].results.result;
if (image) { result.image = <image>{image}</image>; }
}
response.object = search;
]]></execute>
</select>
</bindings>
</table>

Authentication: Search Netflix catalog
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd" https="true">
<meta>...</meta>
<bindings>
<select itemPath="" produces="XML" >
<urls><url env="all">http://api.netflix.com/catalog/titles/</url></urls>
<paging model="offset">
<start id="start_index" default="0" />
<pagesize id="max_results" max="100" />
<total default="10" />
</paging>
<inputs>
<key id="term" type="xs:string" paramType="query" required="true" />
<key id="ck" type="xs:string" paramType="variable" required="true" />
<key id="cks" type="xs:string" paramType="variable" required="true" />
</inputs>
<execute><![CDATA[
// Include the OAuth libraries from oauth.net
y.include("http://oauth.googlecode.com/svn/code/javascript/oauth.js");
y.include("http://oauth.googlecode.com/svn/code/javascript/sha1.js");
// Collect all the parameters
var encodedurl = request.url;
var accessor = { consumerSecret: cks, tokenSecret: ""};
var message = { action: encodedurl, method: "GET", parameters: [["oauth_consumer_key",ck],["oauth_version","1.0"]]};
OAuth.setTimestampAndNonce(message);
// Sign the request
OAuth.SignatureMethod.sign(message, accessor);
try {
// get the content from service along with the OAuth header, and return the result back out
response.object = request.contentType('application/xml').header("Authorization", OAuth.getAuthorizationHeader("netflix.com",
message.parameters)).get().response;
} catch(err) {
response.object = {'result':'failure', 'error': err};
}
]]></execute>
</select>
</bindings>
</table>

select * from twitter.status where
id="2108869549" and username="xxx"
and password="yyy"

<select itemPath="" produces="XML">
<urls><url>http://twitter.com/statuses/show/{id}.xml</url></urls>
<inputs>
<key id="username" type="xs:string" required="false" paramType="variable"/>
<key id="password" type="xs:string" required="false" paramType="variable"/>
<key id="id" type="xs:integer" required="true" paramType="path"/>
</inputs>
<execute><![CDATA[
var r = null;
if (username && password) {
y.include("http://yqlblog.net/samples/base64.js");
var authheader = "Basic "+Base64.encode(username+":"+password);
r = request.header("Authorization",authheader).get().response;
} else {
r = request.get().response;
}
response.object = r;
]]></execute>
</select>

insert into twitter.status
(status,username,password) values
("new tweet from YQL",”xxx”,”yyy”);

<insert itemPath="" produces="XML">
<urls>
<url>http://twitter.com/statuses/update.xml</url>
</urls>
<inputs>
<value id="username" type="xs:string" required="true" paramType="variable"/>
<value id="password" type="xs:string" required="true" paramType="variable"/>
<value id="status" type="xs:string" required="true" paramType="variable"/>
</inputs>
<execute><![CDATA[
var content = "status="+status;
response.object = request.header("Authorization",authheader).post(content).response;
]]></execute>
</insert>

delete from twitter.status where
id="2108869549" and username="xxx"
and password="yyy"

<delete itemPath="" produces="XML">
<urls>
<url>http://twitter.com/statuses/destroy/{id}.xml</url>
</urls>
<inputs>
<key id="username" type="xs:string" required="true" paramType="variable"/>
<key id="password" type="xs:string" required="true" paramType="variable"/>
<key id="id" type="xs:string" required="true" paramType="path"/>
</inputs>
<execute><![CDATA[
response.object = request.header("Authorization",authheader).del().response;
]]></execute>
</delete>

Conclusion

More easily build applications
fewer lines of code
data processing done away from app
consistent and familiar syntax for all data access
iterative environment for developing the query

Conclusion
build applications that run faster
service in the cloud does the work
conversion, ﬁltering, parallel requests...
with smaller network footprint
fewer (client) calls
smaller data amounts
closer to the data, fatter pipes

YQL
select * from internet

http://developer.yahoo.com/yql

Jonathan Trevor
yql-questions@yahoo-inc.com

YQL Open Hackday NYC talk

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