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UpdateEntity.java
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UpdateEntity.java
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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* EDITING INSTRUCTIONS
* This file is referenced in READMEs and javadoc. Any change to this file should be reflected in
* the project's READMEs and package-info.java.
*/
package com.google.cloud.examples.datastore.snippets;
import com.google.cloud.datastore.Datastore;
import com.google.cloud.datastore.DatastoreOptions;
import com.google.cloud.datastore.DateTime;
import com.google.cloud.datastore.Entity;
import com.google.cloud.datastore.Key;
import com.google.cloud.datastore.KeyFactory;
/**
* A snippet for Google Cloud Datastore showing how to get an entity and update it if it exists.
*/
public class UpdateEntity {
public static void main(String... args) {
Datastore datastore = DatastoreOptions.defaultInstance().service();
KeyFactory keyFactory = datastore.newKeyFactory().kind("keyKind");
Key key = keyFactory.newKey("keyName");
Entity entity = datastore.get(key);
if (entity != null) {
System.out.println("Updating access_time for " + entity.getString("name"));
entity = Entity.builder(entity)
.set("access_time", DateTime.now())
.build();
datastore.update(entity);
}
}
}