com.google.cloud.datastore.Datastore.delete()方法的使用及代码示例

x33g5p2x  于2022-01-18 转载在 其他  
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本文整理了Java中com.google.cloud.datastore.Datastore.delete()方法的一些代码示例，展示了Datastore.delete()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Datastore.delete()方法的具体详情如下：
包路径：com.google.cloud.datastore.Datastore
类名称：Datastore
方法名：delete

Datastore.delete介绍

[英]Example of deleting multiple entities.

String keyName1 = "my_key_name1";

[中]

代码示例

代码示例来源：origin: google/data-transfer-project

/**
 * Removes the {@link PortabilityJob} keyed by {@code jobId} in Datastore.
 *
 * @throws IOException if the job doesn't exist, or there was a different problem deleting it.
 */
@Override
public void remove(UUID jobId) throws IOException {
 try {
  datastore.delete(getKey(jobId));
 } catch (DatastoreException e) {
  throw new IOException("Could not remove jobId: " + jobId, e);
 }
}

代码示例来源：origin: googleapis/google-cloud-java

@After
public void tearDown() {
 DATASTORE.delete(KEY1, KEY2, KEY3);
}

代码示例来源：origin: googleapis/google-cloud-java

/** Example of deleting multiple entities. */
// [TARGET delete(Key...)]
// [VARIABLE "my_key_name1"]
// [VARIABLE "my_key_name2"]
public void batchDeleteEntities(String keyName1, String keyName2) {
 // [START batchDeleteEntities]
 Key key1 = datastore.newKeyFactory().setKind("MyKind").newKey(keyName1);
 Key key2 = datastore.newKeyFactory().setKind("MyKind").newKey(keyName2);
 datastore.delete(key1, key2);
 // [END batchDeleteEntities]
}

代码示例来源：origin: googleapis/google-cloud-java

/** Deletes all entities in the namespace associated with this {@link RemoteDatastoreHelper}. */
public void deleteNamespace() {
 StructuredQuery<Key> query = Query.newKeyQueryBuilder().setNamespace(namespace).build();
 QueryResults<Key> keys = datastore.run(query);
 while (keys.hasNext()) {
  datastore.delete(keys.next());
 }
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testDelete() {
 Iterator<Entity> keys =
   DATASTORE.fetch(ENTITY1.getKey(), ENTITY2.getKey(), ENTITY3.getKey()).iterator();
 assertEquals(ENTITY1, keys.next());
 assertEquals(ENTITY2, keys.next());
 assertNull(keys.next());
 assertFalse(keys.hasNext());
 DATASTORE.delete(ENTITY1.getKey(), ENTITY2.getKey(), ENTITY3.getKey());
 keys = DATASTORE.fetch(ENTITY1.getKey(), ENTITY2.getKey(), ENTITY3.getKey()).iterator();
 assertNull(keys.next());
 assertNull(keys.next());
 assertNull(keys.next());
 assertFalse(keys.hasNext());
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testDelete() {
 Iterator<Entity> keys =
   datastore.fetch(ENTITY1.getKey(), ENTITY2.getKey(), ENTITY3.getKey()).iterator();
 assertEquals(ENTITY1, keys.next());
 assertEquals(ENTITY2, keys.next());
 assertNull(keys.next());
 assertFalse(keys.hasNext());
 datastore.delete(ENTITY1.getKey(), ENTITY2.getKey(), ENTITY3.getKey());
 keys = datastore.fetch(ENTITY1.getKey(), ENTITY2.getKey(), ENTITY3.getKey()).iterator();
 assertNull(keys.next());
 assertNull(keys.next());
 assertNull(keys.next());
 assertFalse(keys.hasNext());
}

代码示例来源：origin: googleapis/google-cloud-java

@Before
public void setUp() {
 rpcFactoryMock = EasyMock.createStrictMock(DatastoreRpcFactory.class);
 rpcMock = EasyMock.createStrictMock(DatastoreRpc.class);
 rpcMockOptions =
   options
     .toBuilder()
     .setRetrySettings(ServiceOptions.getDefaultRetrySettings())
     .setServiceRpcFactory(rpcFactoryMock)
     .build();
 EasyMock.expect(rpcFactoryMock.create(rpcMockOptions)).andReturn(rpcMock);
 StructuredQuery<Key> query = Query.newKeyQueryBuilder().build();
 QueryResults<Key> result = datastore.run(query);
 datastore.delete(Iterators.toArray(result, Key.class));
 datastore.add(ENTITY1, ENTITY2);
}

代码示例来源：origin: GoogleCloudPlatform/java-docs-samples

/**
 * Delete a user from Cloud Datastore.
 */
public String deleteUser(String id) {
 Key key = keyFactory.newKey(id);
 datastore.delete(key);
 return "ok";
}

代码示例来源：origin: GoogleCloudPlatform/java-docs-samples

/**
 * Deletes a task entity.
 *
 * @param id The ID of the task entity as given by {@link Key#id()}
 * @throws DatastoreException if the delete fails
 */
void deleteTask(long id) {
 datastore.delete(keyFactory.newKey(id));
}
// [END datastore_delete_entity]

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testAddEntity() {
 List<Entity> keys = DATASTORE.fetch(ENTITY1.getKey(), ENTITY3.getKey());
 assertEquals(ENTITY1, keys.get(0));
 assertNull(keys.get(1));
 assertEquals(2, keys.size());
 try {
  DATASTORE.add(ENTITY1);
  fail("Expecting a failure");
 } catch (DatastoreException expected) {
  // expected;
 }
 List<Entity> entities = DATASTORE.add(ENTITY3, PARTIAL_ENTITY1, PARTIAL_ENTITY2);
 assertEquals(ENTITY3, DATASTORE.get(ENTITY3.getKey()));
 assertEquals(ENTITY3, entities.get(0));
 assertEquals(PARTIAL_ENTITY1.getNames(), entities.get(1).getNames());
 assertEquals(PARTIAL_ENTITY1.getKey().getAncestors(), entities.get(1).getKey().getAncestors());
 assertNotNull(DATASTORE.get(entities.get(1).getKey()));
 assertEquals(PARTIAL_ENTITY2.getNames(), entities.get(2).getNames());
 assertEquals(PARTIAL_ENTITY2.getKey().getAncestors(), entities.get(2).getKey().getAncestors());
 assertNotNull(DATASTORE.get(entities.get(2).getKey()));
 for (Entity entity : entities) {
  DATASTORE.delete(entity.getKey());
 }
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testPut() {
 Entity updatedEntity = Entity.newBuilder(ENTITY1).set("new_property", 42L).build();
 assertEquals(updatedEntity, DATASTORE.put(updatedEntity));
 assertEquals(updatedEntity, DATASTORE.get(updatedEntity.getKey()));
 Entity entity2 = Entity.newBuilder(ENTITY2).clear().set("bla", new NullValue()).build();
 assertNotEquals(ENTITY2, entity2);
 List<Entity> entities = DATASTORE.put(ENTITY1, entity2, ENTITY3, PARTIAL_ENTITY1);
 assertEquals(ENTITY1, entities.get(0));
 assertEquals(entity2, entities.get(1));
 assertEquals(ENTITY3, entities.get(2));
 assertEquals(PARTIAL_ENTITY1.getNames(), entities.get(3).getNames());
 assertEquals(PARTIAL_ENTITY1.getKey().getAncestors(), entities.get(3).getKey().getAncestors());
 assertEquals(ENTITY1, DATASTORE.get(ENTITY1.getKey()));
 assertEquals(entity2, DATASTORE.get(entity2.getKey()));
 assertEquals(ENTITY3, DATASTORE.get(ENTITY3.getKey()));
 Entity entity = DATASTORE.get(entities.get(3).getKey());
 assertEquals(entities.get(3), entity);
 for (Entity entityToDelete : entities) {
  DATASTORE.delete(entityToDelete.getKey());
 }
}

代码示例来源：origin: stackoverflow.com

Delete.java
 String key1=req.getParameter("key").toString();
 PrintWriter out = resp.getWriter();
 out.println("I m in delete");
 System.out.println("the first key is "+key1);
 Datastore ds= DatastoreServiceFactory.getDatastoreService();
 Key UserKey = KeyFactory.createKey("safc",key1 );
 System.out.println("the value od userkey is" +UserKey);
 ds.delete(UserKey);

代码示例来源：origin: stackoverflow.com

Datastore datastore = DatastoreOptions.getDefaultInstance().getService();

// ...

Entity old = null /* some value */;
Key oldKey = old.getKey();
KeyFactory kf = datastore.newKeyFactory().setKind(oldKey.getKind());

Entity newEntity = Entity.newBuilder(old)
    .setKey(kf.newKey(oldKey.getName()))
    .build();

datastore.delete(oldKey);
datastore.put(newEntity);

代码示例来源：origin: org.eclipse.jetty.gcloud/jetty-gcloud-session-manager

@Override
public boolean delete(String id) throws Exception
{
  if (LOG.isDebugEnabled()) LOG.debug("Removing session {} from DataStore", id);
  _datastore.delete(makeKey(id, _context));
  return true;
}

代码示例来源：origin: sai-pullabhotla/catatumbo

@Override
public long deleteAll(String kind) {
 if (Utility.isNullOrEmpty(kind)) {
  throw new IllegalArgumentException("kind cannot be null or blank");
 }
 String query = "SELECT __key__ FROM " + kind;
 try {
  GqlQuery<Key> gqlQuery = Query.newGqlQueryBuilder(Query.ResultType.KEY, query)
    .setNamespace(getEffectiveNamespace()).build();
  QueryResults<Key> keys = datastore.run(gqlQuery);
  Key[] nativeKeys = new Key[DEFAULT_DELETE_ALL_BATCH_SIZE];
  long deleteCount = 0;
  int i = 0;
  while (keys.hasNext()) {
   nativeKeys[i++] = keys.next();
   if (i % DEFAULT_DELETE_ALL_BATCH_SIZE == 0) {
    datastore.delete(nativeKeys);
    deleteCount += DEFAULT_DELETE_ALL_BATCH_SIZE;
    i = 0;
   }
  }
  if (i > 0) {
   datastore.delete(Arrays.copyOfRange(nativeKeys, 0, i));
   deleteCount += i;
  }
  return deleteCount;
 } catch (DatastoreException exp) {
  throw new EntityManagerException(exp);
 }
}

代码示例来源：origin: com.google.cloud/google-cloud-datastore

/** Deletes all entities in the namespace associated with this {@link RemoteDatastoreHelper}. */
public void deleteNamespace() {
 StructuredQuery<Key> query = Query.newKeyQueryBuilder().setNamespace(namespace).build();
 QueryResults<Key> keys = datastore.run(query);
 while (keys.hasNext()) {
  datastore.delete(keys.next());
 }
}

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