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 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">Collecting and Analyzing Data</a><span 
class="spacer">&gt;</span></li><li><span 
class="last">Channel</span></li></ul></div><div 
id="page-title"><h1>Channel</h1></div></div><div 
id="table-of-content-wrapper"><h
 5>On this page</h5><aside id="table-of-contents"><ul> <li> <a 
href="#create-a-new-channel">Create a new Channel</a> </li> <li> <a 
href="#collect-data-through-channel">Collect data through Channel</a> </li> 
<li> <a href="#delete-a-channel-including-all-imported-data">Delete a Channel 
(including all imported data)</a> </li> <li> <a 
href="#delete-the-data-only-of-a-channel">Delete the data-only of a Channel</a> 
</li> <li> <a href="#accessing-channel-data-in-engine">Accessing Channel Data 
in Engine</a> </li> </ul> </aside><hr/><a id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/datacollection/channel.html.md.erb";><img
 src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" 
class="hidden-sm hidden xs"><ul><li><a href="#">Collecting and Analyzing 
Data</a><span class="spacer">&gt;</span></li><li><span 
class="last">Channel</span></li></ul></div><div i
 d="page-title"><h1>Channel</h1></div></div><div class="content"> <p>Each App 
has a default channel (without name) which stores all incoming events. This 
&quot;default&quot; one is used when channel is not specified.</p><p>You may 
create additional Channels for the App. Creating multiple Channels is advanced 
usage. You don&#39;t need to create any in order to use Apache PredictionIO 
(incubating). The Channel is associated with one App only and must have unique 
name within the same App.</p><p>Creating multiple Channels allows you more 
easily to identify, manage and use specific event data if you may collect 
events from different multiple sources (eg. mobile, website, or third-party 
webhooks service) for the your application.</p><p>(More usage details coming 
soon...)</p><h2 id='create-a-new-channel' class='header-anchors'>Create a new 
Channel</h2><p>For example, to create a new channel &quot;myChannel&quot; for 
app &quot;myApp&quot;, run following <code>pio</code> command:</p><div clas
 s="highlight shell"><table style="border-spacing: 0"><tbody><tr><td 
class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td 
class="code"><pre>pio app channel-new myApp myChannel
+<!DOCTYPE html><html><head><title>Channel</title><meta charset="utf-8"/><meta 
content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/><meta name="viewport" 
content="width=device-width, initial-scale=1.0"/><meta class="swiftype" 
name="title" data-type="string" content="Channel"/><link rel="canonical" 
href="https://predictionio.apache.org/datacollection/channel/"/><link 
href="/images/favicon/normal-b330020a.png" rel="shortcut icon"/><link 
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rel="stylesheet"/><link href="/stylesheets/application-eccfc6cb.css" 
rel="stylesheet" type="text/css"/><script 
src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script><script
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true });}catch(e){}</script></head><body><div id="global"><header><div 
class="container" id="header-wrapper"><div class="row"><div 
class="col-sm-12"><div id="logo-wrapper"><span id="drawer-toggle"></span><a 
href="#"></a><a href="http://predictionio.apache.org/";><img alt="Apache 
PredictionIO" id="logo" 
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id="menu-wrapper"><div id="pill-wrapper"><a class="pill left" 
href="/gallery/template-gallery">TEMPLATES</a> <a class="pill right" 
href="//github.com/apache/incubator-predictionio/">OPEN 
SOURCE</a></div></div><img class="mobile-search-bar-toggler hidden-md 
hidden-lg" 
src="/images/icons/search-glass-704bd4ff.png"/></div></div></div></header><div 
id="search-bar-row-wrapper"><div class="container-fluid" 
id="search-bar-row"><div class="row"><div class="col-md-9 col-sm-11 
col-xs-11"><div class="hidden-md hidden
 -lg" id="mobile-page-heading-wrapper"><p>PredictionIO 
Docs</p><h4>Channel</h4></div><h4 class="hidden-sm hidden-xs">PredictionIO 
Docs</h4></div><div class="col-md-3 col-sm-1 col-xs-1 hidden-md hidden-lg"><img 
id="left-menu-indicator" 
src="/images/icons/down-arrow-dfe9f7fe.png"/></div><div class="col-md-3 
col-sm-12 col-xs-12 swiftype-wrapper"><div class="swiftype"><form 
class="search-form"><img class="search-box-toggler hidden-xs hidden-sm" 
src="/images/icons/search-glass-704bd4ff.png"/><div class="search-box"><img 
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id="st-search-input" class="st-search-input" placeholder="Search 
Doc..."/></div><img class="swiftype-row-hider hidden-md hidden-lg" 
src="/images/icons/drawer-toggle-active-fcbef12a.png"/></form></div></div><div 
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hidden-lg"></div></div></div></div><div id="page" class="container-fluid"><div 
class="row"><div id="left-menu-wrapper" class="col-md-3"><nav id="nav-main"><ul
 ><li class="level-1"><a class="expandible" href="/"><span>Apache 
 >PredictionIO™ Documentation</span></a><ul><li class="level-2"><a 
 >class="final" href="/"><span>Welcome to Apache 
 >PredictionIO</span></a></li></ul></li><li class="level-1"><a 
 >class="expandible" href="#"><span>Getting Started</span></a><ul><li 
 >class="level-2"><a class="final" href="/start/"><span>A Quick 
 >Intro</span></a></li><li class="level-2"><a class="final" 
 >href="/install/"><span>Installing Apache PredictionIO</span></a></li><li 
 >class="level-2"><a class="final" href="/start/download/"><span>Downloading an 
 >Engine Template</span></a></li><li class="level-2"><a class="final" 
 >href="/start/deploy/"><span>Deploying Your First Engine</span></a></li><li 
 >class="level-2"><a class="final" href="/start/customize/"><span>Customizing 
 >the Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" 
 >href="#"><span>Integrating with Your App</span></a><ul><li class="level-2"><a 
 >class="final" href="/appintegration/"><span
 >App Integration Overview</span></a></li><li class="level-2"><a 
 >class="expandible" href="/sdk/"><span>List of SDKs</span></a><ul><li 
 >class="level-3"><a class="final" href="/sdk/java/"><span>Java & Android 
 >SDK</span></a></li><li class="level-3"><a class="final" 
 >href="/sdk/php/"><span>PHP SDK</span></a></li><li class="level-3"><a 
 >class="final" href="/sdk/python/"><span>Python SDK</span></a></li><li 
 >class="level-3"><a class="final" href="/sdk/ruby/"><span>Ruby 
 >SDK</span></a></li><li class="level-3"><a class="final" 
 >href="/sdk/community/"><span>Community Powered 
 >SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a 
 >class="expandible" href="#"><span>Deploying an Engine</span></a><ul><li 
 >class="level-2"><a class="final" href="/deploy/"><span>Deploying as a Web 
 >Service</span></a></li><li class="level-2"><a class="final" 
 >href="/batchpredict/"><span>Batch Predictions</span></a></li><li 
 >class="level-2"><a class="final" href="/deploy/monitoring/"><span>Monitoring 
 >Engine</span></a></li
 ><li class="level-2"><a class="final" 
 >href="/deploy/engineparams/"><span>Setting Engine 
 >Parameters</span></a></li><li class="level-2"><a class="final" 
 >href="/deploy/enginevariants/"><span>Deploying Multiple Engine 
 >Variants</span></a></li><li class="level-2"><a class="final" 
 >href="/deploy/plugin/"><span>Engine Server 
 >Plugin</span></a></li></ul></li><li class="level-1"><a class="expandible" 
 >href="#"><span>Customizing an Engine</span></a><ul><li class="level-2"><a 
 >class="final" href="/customize/"><span>Learning DASE</span></a></li><li 
 >class="level-2"><a class="final" href="/customize/dase/"><span>Implement 
 >DASE</span></a></li><li class="level-2"><a class="final" 
 >href="/customize/troubleshooting/"><span>Troubleshooting Engine 
 >Development</span></a></li><li class="level-2"><a class="final" 
 >href="/api/current/#package"><span>Engine Scala 
 >APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" 
 >href="#"><span>Collecting and Analyzing Data</span></a><ul><li 
 >class="level-2"><a
  class="final" href="/datacollection/"><span>Event Server 
Overview</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventapi/"><span>Collecting Data with 
REST/SDKs</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/webhooks/"><span>Unifying Multichannel Data with 
Webhooks</span></a></li><li class="level-2"><a class="final active" 
href="/datacollection/channel/"><span>Channel</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/batchimport/"><span>Importing Data in 
Batch</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/analytics/"><span>Using Analytics 
Tools</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/plugin/"><span>Event Server 
Plugin</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Choosing an Algorithm(s)</span></a><ul>
 <li class="level-2"><a class="final" href="/algorithm/"><span>Built-in 
Algorithm Libraries</span></a></li><li class="level-2"><a class="final" 
href="/algorithm/switch/"><span>Switching to Another 
Algorithm</span></a></li><li class="level-2"><a class="final" 
href="/algorithm/multiple/"><span>Combining Multiple 
Algorithms</span></a></li><li class="level-2"><a class="final" 
href="/algorithm/custom/"><span>Adding Your Own 
Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>ML Tuning and Evaluation</span></a><ul><li class="level-2"><a 
class="final" href="/evaluation/"><span>Overview</span></a></li><li 
class="level-2"><a class="final" 
href="/evaluation/paramtuning/"><span>Hyperparameter Tuning</span></a></li><li 
class="level-2"><a class="final" 
href="/evaluation/evaluationdashboard/"><span>Evaluation 
Dashboard</span></a></li><li class="level-2"><a class="final" 
href="/evaluation/metricchoose/"><span>Choosing Evaluation 
Metrics</span></a></li><li cl
 ass="level-2"><a class="final" href="/evaluation/metricbuild/"><span>Building 
Evaluation Metrics</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>System Architecture</span></a><ul><li 
class="level-2"><a class="final" href="/system/"><span>Architecture 
Overview</span></a></li><li class="level-2"><a class="final" 
href="/system/anotherdatastore/"><span>Using Another Data 
Store</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>PredictionIO Official Templates</span></a><ul><li 
class="level-2"><a class="final" 
href="/templates/"><span>Intro</span></a></li><li class="level-2"><a 
class="expandible" href="#"><span>Recommendation</span></a><ul><li 
class="level-3"><a class="final" 
href="/templates/recommendation/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" href="/templates/recommendation/eval
 uation/"><span>Evaluation Explained</span></a></li><li class="level-3"><a 
class="final" 
href="/templates/recommendation/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/recommendation/reading-custom-events/"><span>Read Custom 
Events</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-data-prep/"><span>Customize Data 
Preparator</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-serving/"><span>Customize 
Serving</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/training-with-implicit-preference/"><span>Train 
with Implicit Preference</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/blacklist-items/"><span>Filter Recommended 
Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/batch-evaluator/"><span>Batch Persistable 
Evaluator</span></
 a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a 
class="final" href="/templates/ecommercerecommendation/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/how-to/"><span>How-To</span></a></li><li
 class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/train-with-rate-event/"><span>Train 
with Rate Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/adjust-score/"><span>Adjust 
Score</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Similar Product</span></a><ul><li class="level-3"><a 
class="final" href="/templates/similarproduct/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" href="/templ
 ates/similarproduct/dase/"><span>DASE</span></a></li><li class="level-3"><a 
class="final" 
href="/templates/similarproduct/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/similarproduct/multi-events-multi-algos/"><span>Multiple 
Events and Multiple Algorithms</span></a></li><li class="level-3"><a 
class="final" 
href="/templates/similarproduct/return-item-properties/"><span>Returns Item 
Properties</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/train-with-rate-event/"><span>Train with Rate 
Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/rid-user-set-event/"><span>Get Rid of Events 
for Users</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/recommended-user/"><span>Recommend 
Users</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Classification</span></a><ul><li class="level-3"><a 
class="final" href="/te
 mplates/classification/quickstart/"><span>Quick Start</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/classification/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/classification/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/classification/add-algorithm/"><span>Use Alternative 
Algorithm</span></a></li><li class="level-3"><a class="final" 
href="/templates/classification/reading-custom-properties/"><span>Read Custom 
Properties</span></a></li></ul></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li 
class="level-2"><a class="final" 
href="/gallery/template-gallery/"><span>Browse</span></a></li><li 
class="level-2"><a class="final" 
href="/community/submit-template/"><span>Submit your Engine as a 
Template</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Demo Tutorials</span></a><ul><li class="
 level-2"><a class="final" href="/demo/tapster/"><span>Comics Recommendation 
Demo</span></a></li><li class="level-2"><a class="final" 
href="/demo/community/"><span>Community Contributed Demo</span></a></li><li 
class="level-2"><a class="final" href="/demo/textclassification/"><span>Text 
Classification Engine Tutorial</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="/community/"><span>Getting Involved</span></a><ul><li 
class="level-2"><a class="final" 
href="/community/contribute-code/"><span>Contribute Code</span></a></li><li 
class="level-2"><a class="final" 
href="/community/contribute-documentation/"><span>Contribute 
Documentation</span></a></li><li class="level-2"><a class="final" 
href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li 
class="level-2"><a class="final" 
href="/community/contribute-webhook/"><span>Contribute a 
Webhook</span></a></li><li class="level-2"><a class="final" 
href="/community/projects/"><span>Community Projects</span
 ></a></li></ul></li><li class="level-1"><a class="expandible" 
 >href="#"><span>Getting Help</span></a><ul><li class="level-2"><a 
 >class="final" href="/resources/faq/"><span>FAQs</span></a></li><li 
 >class="level-2"><a class="final" 
 >href="/support/"><span>Support</span></a></li></ul></li><li 
 >class="level-1"><a class="expandible" 
 >href="#"><span>Resources</span></a><ul><li class="level-2"><a class="final" 
 >href="/cli/"><span>Command-line Interface</span></a></li><li 
 >class="level-2"><a class="final" href="/resources/release/"><span>Release 
 >Cadence</span></a></li><li class="level-2"><a class="final" 
 >href="/resources/intellij/"><span>Developing Engines with IntelliJ 
 >IDEA</span></a></li><li class="level-2"><a class="final" 
 >href="/resources/upgrade/"><span>Upgrade Instructions</span></a></li><li 
 >class="level-2"><a class="final" 
 >href="/resources/glossary/"><span>Glossary</span></a></li></ul></li><li 
 >class="level-1"><a class="expandible" href="#"><span>Apache Software 
 >Foundation</span></a><ul><li c
 lass="level-2"><a class="final" href="https://www.apache.org/";><span>Apache 
Homepage</span></a></li><li class="level-2"><a class="final" 
href="https://www.apache.org/licenses/";><span>License</span></a></li><li 
class="level-2"><a class="final" 
href="https://www.apache.org/foundation/sponsorship.html";><span>Sponsorship</span></a></li><li
 class="level-2"><a class="final" 
href="https://www.apache.org/foundation/thanks.html";><span>Thanks</span></a></li><li
 class="level-2"><a class="final" 
href="https://www.apache.org/security/";><span>Security</span></a></li></ul></li></ul></nav></div><div
 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">Collecting and Analyzing Data</a><span 
class="spacer">&gt;</span></li><li><span 
class="last">Channel</span></li></ul></div><div 
id="page-title"><h1>Channel</h1></div></div><div 
id="table-of-content-wrapper"><h5>On this page</h5><aside 
id="table-of-contents"><ul
 > <li> <a href="#create-a-new-channel">Create a new Channel</a> </li> <li> <a 
 > href="#collect-data-through-channel">Collect data through Channel</a> </li> 
 > <li> <a href="#delete-a-channel-including-all-imported-data">Delete a 
 > Channel (including all imported data)</a> </li> <li> <a 
 > href="#delete-the-data-only-of-a-channel">Delete the data-only of a 
 > Channel</a> </li> <li> <a href="#accessing-channel-data-in-engine">Accessing 
 > Channel Data in Engine</a> </li> </ul> </aside><hr/><a id="edit-page-link" 
 > href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/datacollection/channel.html.md.erb";><img
 >  src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
 > class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" 
 > class="hidden-sm hidden xs"><ul><li><a href="#">Collecting and Analyzing 
 > Data</a><span class="spacer">&gt;</span></li><li><span 
 > class="last">Channel</span></li></ul></div><div 
 > id="page-title"><h1>Channel</h1></div></div><div clas
 s="content"> <p>Each App has a default channel (without name) which stores all 
incoming events. This &quot;default&quot; one is used when channel is not 
specified.</p><p>You may create additional Channels for the App. Creating 
multiple Channels is advanced usage. You don&#39;t need to create any in order 
to use Apache PredictionIO (incubating). The Channel is associated with one App 
only and must have unique name within the same App.</p><p>Creating multiple 
Channels allows you more easily to identify, manage and use specific event data 
if you may collect events from different multiple sources (eg. mobile, website, 
or third-party webhooks service) for the your application.</p><p>(More usage 
details coming soon...)</p><h2 id='create-a-new-channel' 
class='header-anchors'>Create a new Channel</h2><p>For example, to create a new 
channel &quot;myChannel&quot; for app &quot;myApp&quot;, run following 
<code>pio</code> command:</p><div class="highlight shell"><table 
style="border-spacing: 0"
 ><tbody><tr><td class="gutter gl" style="text-align: right"><pre 
 >class="lineno">1</pre></td><td class="code"><pre>pio app channel-new myApp 
 >myChannel
 </pre></td></tr></tbody></table> </div> <p>you should see something like the 
following outputs:</p><div class="highlight shell"><table 
style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: 
right"><pre class="lineno">1
 2
 3
@@ -12,7 +12,7 @@
 [INFO] [App$]     Channel Name: myChannel
 [INFO] [App$]       Channel ID: 2
 [INFO] [App$]           App ID: 5
-</span></pre></td></tr></tbody></table> </div> <p>Now &quot;myChannel&quot; is 
created and ready for collecting data.</p><h2 id='collect-data-through-channel' 
class='header-anchors'>Collect data through Channel</h2><p>The Event API 
support optional <code>channel</code> query parameter. This allows you to 
import and query events of the specified channel. When the <code>channel</code> 
parameter is not specified, the data is collected through the default 
channel.</p><p>URL: 
<code>http://localhost:7070/events.json?accessKey=yourAccessKeyString&amp;channel=yourChannelName</code></p><p>Query
 parameters:</p> <table><thead> <tr> <th style="text-align: left">Field</th> 
<th style="text-align: left">Type</th> <th style="text-align: 
left">Description</th> </tr> </thead><tbody> <tr> <td style="text-align: 
left"><code>accessKey</code></td> <td style="text-align: left">String</td> <td 
style="text-align: left">The Access Key for your App</td> </tr> <tr> <td 
style="text-align: left"><code>channel</c
 ode></td> <td style="text-align: left">String</td> <td style="text-align: 
left">The channel name (optional). Specify this to import data to this channel. 
<strong>NOTE: supported in PIO version &gt;= 0.9.2</strong> only. Channel must 
be created first.</td> </tr> </tbody></table> <p>For SDK usage, one EventClient 
should be responsible for collecting data of one specific channel. The channel 
name is specified when the EventClient object is instantiated.</p><p>For 
example, the following code import event to &quot;YOUR_CHANNEL&quot; of the 
corresponding App.</p><div class="tabs"> <ul class="control"> <li 
data-lang="bash"><a href="#tab-8fbff4f6-1d34-49a1-8610-d6bf89545d70">Raw 
HTTP</a></li> <li data-lang="php"><a 
href="#tab-0fa17343-1a23-49db-a5ca-6443097aa993">PHP SDK</a></li> <li 
data-lang="python"><a href="#tab-4a3d327f-4e64-433a-b8bb-55049f8c74e2">Python 
SDK</a></li> <li data-lang="ruby"><a 
href="#tab-44e5ae5c-3915-4572-8f5c-c34e160dbdab">Ruby SDK</a></li> <li 
data-lang="java"><a href
 ="#tab-1dc60b5c-94f2-4d20-bb4e-e9aee3d7c4bd">Java SDK</a></li> </ul> <div 
data-tab="Raw HTTP" data-lang="bash" 
id="tab-8fbff4f6-1d34-49a1-8610-d6bf89545d70"> <div class="highlight shell"> 
<table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" 
style="text-align: right"><pre class="lineno">1
+</span></pre></td></tr></tbody></table> </div> <p>Now &quot;myChannel&quot; is 
created and ready for collecting data.</p><h2 id='collect-data-through-channel' 
class='header-anchors'>Collect data through Channel</h2><p>The Event API 
support optional <code>channel</code> query parameter. This allows you to 
import and query events of the specified channel. When the <code>channel</code> 
parameter is not specified, the data is collected through the default 
channel.</p><p>URL: 
<code>http://localhost:7070/events.json?accessKey=yourAccessKeyString&amp;channel=yourChannelName</code></p><p>Query
 parameters:</p> <table><thead> <tr> <th style="text-align: left">Field</th> 
<th style="text-align: left">Type</th> <th style="text-align: 
left">Description</th> </tr> </thead><tbody> <tr> <td style="text-align: 
left"><code>accessKey</code></td> <td style="text-align: left">String</td> <td 
style="text-align: left">The Access Key for your App</td> </tr> <tr> <td 
style="text-align: left"><code>channel</c
 ode></td> <td style="text-align: left">String</td> <td style="text-align: 
left">The channel name (optional). Specify this to import data to this channel. 
<strong>NOTE: supported in PIO version &gt;= 0.9.2</strong> only. Channel must 
be created first.</td> </tr> </tbody></table> <p>For SDK usage, one EventClient 
should be responsible for collecting data of one specific channel. The channel 
name is specified when the EventClient object is instantiated.</p><p>For 
example, the following code import event to &quot;YOUR_CHANNEL&quot; of the 
corresponding App.</p><div class="tabs"> <ul class="control"> <li 
data-lang="bash"><a href="#tab-a53c97ee-b966-465e-b7ab-3a4040fab9cf">Raw 
HTTP</a></li> <li data-lang="php"><a 
href="#tab-da6c9e07-50cd-46b8-8a43-f6d84a56b47b">PHP SDK</a></li> <li 
data-lang="python"><a href="#tab-3beedae4-7df5-4625-825b-fd95b2d7807c">Python 
SDK</a></li> <li data-lang="ruby"><a 
href="#tab-3b1cdab1-4079-4a29-a7b5-507bb0394f8f">Ruby SDK</a></li> <li 
data-lang="java"><a href
 ="#tab-459460a5-3c73-4472-bca7-14cf5110af29">Java SDK</a></li> </ul> <div 
data-tab="Raw HTTP" data-lang="bash" 
id="tab-a53c97ee-b966-465e-b7ab-3a4040fab9cf"> <div class="highlight shell"> 
<table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" 
style="text-align: right"><pre class="lineno">1
 2
 3
 4
@@ -39,7 +39,7 @@
   },
   "eventTime" : "2004-12-13T21:39:45.618Z"
 }'</span>
-</pre></td> </tr></tbody></table> </div> </div> <div data-tab="PHP SDK" 
data-lang="php" id="tab-0fa17343-1a23-49db-a5ca-6443097aa993"> (TODO: update 
me) </div> <div data-tab="Python SDK" data-lang="python" 
id="tab-4a3d327f-4e64-433a-b8bb-55049f8c74e2"> <div class="highlight python"> 
<table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" 
style="text-align: right"><pre class="lineno">1
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="PHP SDK" 
data-lang="php" id="tab-da6c9e07-50cd-46b8-8a43-f6d84a56b47b"> (TODO: update 
me) </div> <div data-tab="Python SDK" data-lang="python" 
id="tab-3beedae4-7df5-4625-825b-fd95b2d7807c"> <div class="highlight python"> 
<table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" 
style="text-align: right"><pre class="lineno">1
 2
 3
 4
@@ -80,7 +80,7 @@
     <span class="n">properties</span><span class="o">=</span><span 
class="n">event_properties</span><span class="p">,</span>
     <span class="n">event_time</span><span class="o">=</span><span 
class="n">datetime</span><span class="p">(</span><span 
class="mi">2014</span><span class="p">,</span> <span class="mi">12</span><span 
class="p">,</span> <span class="mi">13</span><span class="p">,</span> <span 
class="mi">21</span><span class="p">,</span> <span class="mi">38</span><span 
class="p">,</span> <span class="mi">45</span><span class="p">,</span> <span 
class="mi">618000</span><span class="p">,</span> <span 
class="n">pytz</span><span class="o">.</span><span class="n">utc</span><span 
class="p">))</span>
 
-</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" 
data-lang="ruby" id="tab-44e5ae5c-3915-4572-8f5c-c34e160dbdab"> (TODO: update 
me) </div> <div data-tab="Java SDK" data-lang="java" 
id="tab-1dc60b5c-94f2-4d20-bb4e-e9aee3d7c4bd"> <div class="highlight java"> 
<table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" 
style="text-align: right"><pre class="lineno">1</pre></td> <td 
class="code"><pre><span class="o">(</span><span class="n">coming</span> <span 
class="n">soon</span><span class="o">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" 
data-lang="ruby" id="tab-3b1cdab1-4079-4a29-a7b5-507bb0394f8f"> (TODO: update 
me) </div> <div data-tab="Java SDK" data-lang="java" 
id="tab-459460a5-3c73-4472-bca7-14cf5110af29"> <div class="highlight java"> 
<table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" 
style="text-align: right"><pre class="lineno">1</pre></td> <td 
class="code"><pre><span class="o">(</span><span class="n">coming</span> <span 
class="n">soon</span><span class="o">)</span>
 </pre></td> </tr></tbody></table> </div> </div> </div> <p>You can also follow 
the EventAPI <a href="/datacollection/eventapi/#debugging-recipes">debug 
receipts</a> to query the events of specific channel by adding the 
<code>channel</code> query parameter in the URL.</p><h2 
id='delete-a-channel-(including-all-imported-data)' 
class='header-anchors'>Delete a Channel (including all imported data)</h2><div 
class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td 
class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td 
class="code"><pre>pio app channel-delete &lt;app name&gt; &lt;channel name&gt;
 </pre></td></tr></tbody></table> </div> <h2 
id='delete-the-data-only-of-a-channel' class='header-anchors'>Delete the 
data-only of a Channel</h2><div class="highlight shell"><table 
style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: 
right"><pre class="lineno">1</pre></td><td class="code"><pre>pio app 
data-delete &lt;app name&gt; --channel &lt;channel name&gt;
 </pre></td></tr></tbody></table> </div> <h2 
id='accessing-channel-data-in-engine' class='header-anchors'>Accessing Channel 
Data in Engine</h2><p>To acccess channel data, simply specify the channel name 
when use the PEventStore or LEventStore API. Data is read from from the default 
channel if channelName is not specified.</p><p>For example, read data from 
default channel:</p><div class="highlight scala"><table style="border-spacing: 
0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre 
class="lineno">1
@@ -115,7 +115,7 @@
 </span>      <span class="c1">// targetEntityType is optional field of an 
event.
 </span>      <span class="n">targetEntityType</span> <span class="k">=</span> 
<span class="nc">Some</span><span class="o">(</span><span 
class="nc">Some</span><span class="o">(</span><span 
class="s">"item"</span><span class="o">)))(</span><span 
class="n">sc</span><span class="o">)</span>
 
-</pre></td></tr></tbody></table> </div> </div></div></div></div><footer><div 
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