YQL Overview

1
Jonathan LeBlanc – Technology Evangelist
Yahoo! Developer Network
Twitter: @jcleblanc

3
YQL Query StructureSELECT * FROM Internet

4
YQL Test Console
Available At: http://developer.yahoo.com/yql/console

5
Running Queries - SELECT Query Structure
SELECTmyColumn, myTitle
FROM myTable(0, 50)
WHEREmyColumn = 'value' ANDmyTitle = 'title‘
LIMIT3 OFFSET 10 |
sort(field='myColumn') | reverse()

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Running Queries - INSERT / UPDATE / DELETE
Modify Data on the Internet
Create Tweets, Add Blog Entries, Update Databases
Current Tables Using I/U/D
Twitter Status, bit.ly URL Shortner, Yahoo! Profile Status / Update
Stream, Amazon
SimpleDB

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Running Queries - INSERT Query Structure
INSERT INTObitly.shorten (login, apiKey, longUrl)
VALUES (’ME', 'API_KEY', 'http://yahoo.com')

8
Running Queries - UPDATE Query Structure
UPDATE social.profile.status
SET status="Using YQL UPDATE"
WHEREguid=“NJFIDHVPVVISDXZKT7UKED2WHU”

9
Running Queries - DELETE Query Structure
DELETE FROM twittertable
WHERE tweetid="12345"
AND username="twitter_username"
AND password="twitter_password

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Running Queries – Sub-selects with the IN clause
SELECT * FROM flickr.photos.search
WHERE (lat, lon)
IN (SELECT centroid.latitude, centroid.longitude FROM geo.places WHERE text="SFO")

11
Running Queries – Available Tables
YQL Command: SHOW Tables
Number of Standard Tables: 113
Number of Community Tables: 610
Total Number of Tables: 723
Contribute Tables to:
http://www.github.com/yql/yql-tables/

12
Running Queries – Table Syntax
YQL Command: DESC tablename

Running Queries – URL Format
http://query.yahooapis.com/v1/yql?[params]
http://query.yahooapis.com/v1/public/yql?[params]
Params
q=[QUERY]
format=[XML / JSON]
diagnostics=[true / false]
debug=[true / false]
env=[.env file link]
callback=[function name]
13

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Running Queries – URL Format
http://query.yahooapis.com/v1/yql?[params]
http://query.yahooapis.com/v1/public/yql?[params]
Params
q=[QUERY]
format=[XML / JSON / JSONP / JSONP-X]
diagnostics=[true / false]
debug=[true / false]
env=[.env file link]
callback=[function name]

15
Query Aliasing – Creating Your Alias
http://queries.yahooapis.com/v1/public/yql/
[user_alias]/[query_alias]
Create Your User Alias
INSERT INTO yql.queries (alias) VALUES (”jcleblanc")
Insert a new Query Alias
INSERT INTO yql.queries.query (name, query) VALUES ("weather", ”SELECT * FROM weather.forecast WHERE location=90210")

16
YQL Open Data TablesWrap Your Own API or Data Source

17
Open Data Tables – XML File Syntax
<?xml version="1.0" encoding="UTF-8"?>
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
<meta></meta>
<bindings></bindings>
</table>

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<meta></meta>
</table>

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<meta>
<author>Jonathan LeBlanc</author>
<description>My Table</description>
<documentationURL>www.site.com</documentationURL>
<sampleQuery>SELECT * FROM {table} </sampleQuery>
</meta>
</table>

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<meta></meta>
</table>

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<meta></meta>
<bindings>
<select itemPath="" produces="XML" >
<urls>
<urlenv="all”>http://www.site.com/{user}</url>
</urls>
<inputs>
<key id="user" type="xs:string" paramType="path"
required="true" /> </inputs>
</select>
</bindings>
</table>

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Open Data Tables – Invoking a Table Definition
The USE clause
USE 'http://github.com/yql/yql-tables/raw/master/google/google.buzz.updates.xml'
AS buzz.updates;
SELECT * FROM buzz.updates
WHERE user='nakedtechnologist'

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Open Data Tables – .env Files
http://datatables.org/alltables.env
USE 'http://www.datatables.org/amazon/amazon.ecs.xml' AS amazon.ecs;
USE 'http://www.datatables.org/bitly/bit.ly.shorten.xml' AS bit.ly.shorten;
USE 'http://www.datatables.org/dopplr/dopplr.auth.xml' AS dopplr.auth;
USE 'http://www.datatables.org/dopplr/dopplr.city.info.xml' AS dopplr.city.info;

Google Buzz Table
Available At: http://github.com/yql/yql-tables

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YQL ExecuteExtending Open Data Tables

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YQL Execute – XML File Syntax
Augment data
city / state to APIs that just return zip code
Create APIs from web pages
celebrity birthdays scraped from IMDB
Data Transformations
convert the results from xml to Google's kml format
Move business logic of your application to the cloud

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<meta></meta>
<bindings>
<urls></urls>
<inputs></inputs>
</select>
</bindings>
</table>

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<meta></meta>
<bindings>
<urls></urls>
<inputs></inputs>
<execute></execute>
</select>
</bindings>
</table>

Global Disaster Alert and Coordination System Table
Available At: http://github.com/yql/yql-tables

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Conclusion
Build applications faster
(and that run faster)

This Presentation
http://www.slideshare.net/jcleblanc/yql-overview
YQL Documentation
http://developer.yahoo.com/yql
YQL Console
http://developer.yahoo.com/yql/console
YQL Github Account (Contribute Tables)
http://github.com/yql/yql-tables

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Thank YouQuestions?

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YQL Overview

by Jonathan LeBlanc on Feb 20, 2010

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