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<div class="subTitle">org.apache.beam.sdk.io.gcp.datastore</div>
<h2 title="Class DatastoreV1" class="title">Class DatastoreV1</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.apache.beam.sdk.io.gcp.datastore.DatastoreV1</li>
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<pre>public class <span class="typeNameLabel">DatastoreV1</span>
extends java.lang.Object</pre>
<div class="block"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1</code></a> provides an API to Read, Write and Delete <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollections</code></a> of
<a href="https://developers.google.com/datastore/">Google Cloud Datastore</a> version v1 <code>Entity</code> objects. Read is only supported for Bounded PCollections while Write and Delete are
supported for both Bounded and Unbounded PCollections.
<p>This API currently requires an authentication workaround. To use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1</code></a>, users
must use the <code>gcloud</code> command line tool to get credentials for Cloud Datastore:
<pre>
$ gcloud auth login
</pre>
<p>To read a <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> from a query to Cloud Datastore, use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html#read--"><code>read()</code></a>
and its methods <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html#withProjectId-java.lang.String-"><code>DatastoreV1.Read.withProjectId(java.lang.String)</code></a> and <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html#withQuery-com.google.datastore.v1.Query-"><code>DatastoreV1.Read.withQuery(com.google.datastore.v1.Query)</code></a> to
specify the project to query and the query to read from. You can optionally provide a namespace
to query within using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html#withNamespace-java.lang.String-"><code>DatastoreV1.Read.withNamespace(java.lang.String)</code></a>. You could also optionally specify
how many splits you want for the query using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html#withNumQuerySplits-int-"><code>DatastoreV1.Read.withNumQuerySplits(int)</code></a>.
<p>For example:
<pre><code>
// Read a query from Datastore
PipelineOptions options = PipelineOptionsFactory.fromArgs(args).create();
Query query = ...;
String projectId = "...";
Pipeline p = Pipeline.create(options);
PCollection&lt;Entity&gt; entities = p.apply(
DatastoreIO.v1().read()
.withProjectId(projectId)
.withQuery(query));
</code></pre>
<p><b>Note:</b> A runner may read from Cloud Datastore in parallel across many workers. However,
when the <code>Query</code> is configured with a limit using <code>Query.Builder.setLimit(Int32Value)</code> or if the Query contains inequality
filters like <code>GREATER_THAN, LESS_THAN</code> etc., then all returned results will be read by a
single worker in order to ensure correct data. Since data is read from a single worker, this
could have a significant impact on the performance of the job.
<p>To write a <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> to a Cloud Datastore, use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html#write--"><code>write()</code></a>, specifying
the Cloud Datastore project to write to:
<pre><code>
PCollection&lt;Entity&gt; entities = ...;
entities.apply(DatastoreIO.v1().write().withProjectId(projectId));
p.run();
</code></pre>
<p>To delete a <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> of <code>Entities</code> from Cloud Datastore, use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html#deleteEntity--"><code>deleteEntity()</code></a>, specifying the Cloud Datastore project to write to:
<pre><code>
PCollection&lt;Entity&gt; entities = ...;
entities.apply(DatastoreIO.v1().deleteEntity().withProjectId(projectId));
p.run();
</code></pre>
<p>To delete entities associated with a <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> of <code>Keys</code> from Cloud
Datastore, use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html#deleteKey--"><code>deleteKey()</code></a>, specifying the Cloud Datastore project to write to:
<pre><code>
PCollection&lt;Entity&gt; entities = ...;
entities.apply(DatastoreIO.v1().deleteKey().withProjectId(projectId));
p.run();
</code></pre>
<p><code>Entities</code> in the <code>PCollection</code> to be written or deleted must have complete
<code>Keys</code>. Complete <code>Keys</code> specify the <code>name</code> and <code>id</code> of the <code>Entity</code>, where incomplete <code>Keys</code> do not. A <code>namespace</code> other than <code>projectId</code>
default may be used by specifying it in the <code>Entity</code> <code>Keys</code>.
<pre><code>
Key.Builder keyBuilder = DatastoreHelper.makeKey(...);
keyBuilder.getPartitionIdBuilder().setNamespace(namespace);
</code></pre>
<p><code>Entities</code> will be committed as upsert (update or insert) or delete mutations. Please
read <a href="https://cloud.google.com/datastore/docs/concepts/entities">Entities, Properties,
and Keys</a> for more information about <code>Entity</code> keys.
<h3>Permissions</h3>
Permission requirements depend on the <code>PipelineRunner</code> that is used to execute the
pipeline. Please refer to the documentation of corresponding <code>PipelineRunner</code>s for more
details.
<p>Please see <a href="https://cloud.google.com/datastore/docs/activate">Cloud Datastore Sign Up
</a>for security and permission related information specific to Cloud Datastore.
<p>Optionally, Cloud Datastore V1 Emulator, running locally, could be used for testing purposes
by providing the host port information through <code>withLocalhost("host:port"</code> for all the
above transforms. In such a case, all the Cloud Datastore API calls are directed to the Emulator.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../../org/apache/beam/sdk/PipelineRunner.html" title="class in org.apache.beam.sdk"><code>PipelineRunner</code></a></dd>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteEntity.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.DeleteEntity</a></span></code>
<div class="block">A <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that deletes <code>Entities</code> from Cloud Datastore.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteKey.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.DeleteKey</a></span></code>
<div class="block">A <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that deletes <code>Entities</code> associated with the given <code>Keys</code> from Cloud Datastore.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.Read</a></span></code>
<div class="block">A <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that reads the result rows of a Cloud Datastore query as <code>Entity</code>
objects.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Write.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.Write</a></span></code>
<div class="block">A <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that writes <code>Entity</code> objects to Cloud Datastore.</div>
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<td class="colFirst"><code><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteEntity.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.DeleteEntity</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html#deleteEntity--">deleteEntity</a></span>()</code>
<div class="block">Returns an empty <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteEntity.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1.DeleteEntity</code></a> builder.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteKey.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.DeleteKey</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html#deleteKey--">deleteKey</a></span>()</code>
<div class="block">Returns an empty <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteKey.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1.DeleteKey</code></a> builder.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.Read</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html#read--">read</a></span>()</code>
<div class="block">Returns an empty <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1.Read</code></a> builder.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Write.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.Write</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.html#write--">write</a></span>()</code>
<div class="block">Returns an empty <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Write.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1.Write</code></a> builder.</div>
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<h4>read</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.Read</a>&nbsp;read()</pre>
<div class="block">Returns an empty <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1.Read</code></a> builder. Configure the source <code>projectId</code>,
<code>query</code>, and optionally <code>namespace</code> and <code>numQuerySplits</code> using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html#withProjectId-java.lang.String-"><code>DatastoreV1.Read.withProjectId(java.lang.String)</code></a>, <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html#withQuery-com.google.datastore.v1.Query-"><code>DatastoreV1.Read.withQuery(com.google.datastore.v1.Query)</code></a>, <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html#withNamespace-java.lang.String-"><code>DatastoreV1.Read.withNamespace(java.lang.String)</code></a>, <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Read.html#withNumQuerySplits-int-"><code>DatastoreV1.Read.withNumQuerySplits(int)</code></a>.</div>
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<h4>write</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Write.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.Write</a>&nbsp;write()</pre>
<div class="block">Returns an empty <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Write.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1.Write</code></a> builder. Configure the destination <code>projectId</code>
using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.Write.html#withProjectId-java.lang.String-"><code>DatastoreV1.Write.withProjectId(java.lang.String)</code></a>.</div>
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<h4>deleteEntity</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteEntity.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.DeleteEntity</a>&nbsp;deleteEntity()</pre>
<div class="block">Returns an empty <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteEntity.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1.DeleteEntity</code></a> builder. Configure the destination <code>projectId</code>
using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteEntity.html#withProjectId-java.lang.String-"><code>DatastoreV1.DeleteEntity.withProjectId(java.lang.String)</code></a>.</div>
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<h4>deleteKey</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteKey.html" title="class in org.apache.beam.sdk.io.gcp.datastore">DatastoreV1.DeleteKey</a>&nbsp;deleteKey()</pre>
<div class="block">Returns an empty <a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteKey.html" title="class in org.apache.beam.sdk.io.gcp.datastore"><code>DatastoreV1.DeleteKey</code></a> builder. Configure the destination <code>projectId</code> using
<a href="../../../../../../../org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.DeleteKey.html#withProjectId-java.lang.String-"><code>DatastoreV1.DeleteKey.withProjectId(java.lang.String)</code></a>.</div>
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