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Add Datastore quickstart sample.
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‎datastore/cloud-client/pom.xml

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<!--
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Copyright 2016 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<project>
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<modelVersion>4.0.0</modelVersion>
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<groupId>come.example.datastore</groupId>
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<artifactId>datastore-google-cloud-samples</artifactId>
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<packaging>jar</packaging>
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<!-- Parent defines config for testing & linting. -->
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<parent>
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<artifactId>doc-samples</artifactId>
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<groupId>com.google.cloud</groupId>
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<version>1.0.0</version>
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<relativePath>../..</relativePath>
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</parent>
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<properties>
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<maven.compiler.target>1.8</maven.compiler.target>
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<maven.compiler.source>1.8</maven.compiler.source>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.google.cloud</groupId>
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<artifactId>google-cloud-datastore</artifactId>
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<version>0.4.0</version>
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</dependency>
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</dependencies>
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</project>

‎datastore/cloud-client/src/main/java/com/example/datastore/QuickstartSample.java

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/*
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Copyright 2016, Google, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package com.example.datastore;
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// [START bigquery_quickstart]
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// Imports the Google Cloud client library
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import com.google.cloud.datastore.Datastore;
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import com.google.cloud.datastore.DatastoreOptions;
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import com.google.cloud.datastore.Entity;
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import com.google.cloud.datastore.Key;
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import com.google.cloud.datastore.KeyFactory;
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public class QuickstartSample {
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public static void main(String... args) throws Exception {
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// Instantiates a client
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Datastore datastore = DatastoreOptions.defaultInstance().service();
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// The kind for the new entity
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String kind = "Task";
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// The name/ID for the new entity
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String name = "sampletask1";
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// The Cloud Datastore key for the new entity
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Key taskKey = datastore.newKeyFactory().kind(kind).newKey(name);
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// Prepares the new entity
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Entity task = Entity.builder(taskKey)
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.set("description", "Buy milk")
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.build();
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// Saves the entity
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datastore.put(task);
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System.out.printf("Saved %s: %s%n", task.key().name(), task.getString("description"));
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}
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}
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// [END bigquery_quickstart]

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