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

x33g5p2x  于2022-01-19 转载在 其他  
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本文整理了Java中com.google.cloud.datastore.Entity.getString()方法的一些代码示例，展示了Entity.getString()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。Entity.getString()方法的具体详情如下：
包路径：com.google.cloud.datastore.Entity
类名称：Entity
方法名：getString

Entity.getString介绍

暂无

代码示例

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

@Override
public <T extends DataModel> T findData(UUID jobId, String key, Class<T> type) {
 Key entityKey = getDataKey(jobId, key);
 Entity entity = datastore.get(entityKey);
 if (entity == null) {
  return null;
 }
 String serializedEntity = entity.getString(type.getName());
 try {
  return objectMapper.readValue(serializedEntity, type);
 } catch (IOException t) {
  throw new RuntimeException("Failed to deserialize entity: " + serializedEntity, t);
 }
}

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

private static Map<String, Object> getProperties(Entity entity)
  throws IOException, ClassNotFoundException {
 if (entity == null) {
  return null;
 }
 ImmutableMap.Builder<String, Object> builder = new ImmutableMap.Builder<>();
 for (String property : entity.getNames()) {
  // builder.put(property, entity.getValue(property));
  if (entity.getValue(property) instanceof StringValue) {
   builder.put(property, (String) entity.getString(property));
  } else if (entity.getValue(property) instanceof LongValue) {
   // This conversion is safe because of integer to long conversion above
   builder.put(property, new Long(entity.getLong(property)).intValue());
  } else if (entity.getValue(property) instanceof DoubleValue) {
   builder.put(property, (Double) entity.getDouble(property));
  } else if (entity.getValue(property) instanceof BooleanValue) {
   builder.put(property, (Boolean) entity.getBoolean(property));
  } else if (entity.getValue(property) instanceof TimestampValue) {
   builder.put(property, (Timestamp) entity.getTimestamp(property));
  } else {
   Blob blob = entity.getBlob(property);
   Object obj = null;
   try (ObjectInputStream in = new ObjectInputStream(blob.asInputStream())) {
    obj = in.readObject();
   }
   builder.put(property, obj); // BlobValue
  }
 }
 return builder.build();
}

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

public static void main(String... args) {
  Datastore datastore = DatastoreOptions.getDefaultInstance().getService();
  KeyFactory keyFactory = datastore.newKeyFactory().setKind("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.newBuilder(entity).set("access_time", Timestamp.now()).build();
   datastore.update(entity);
  }
 }
}

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

while (results.hasNext()) {
 Entity result = results.next();
 sortedComments.put(result.getTimestamp("timestamp"), result.getString("content"));
 resultCount++;

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

@Test
public void testEntity() throws Exception {
 assertTrue(ENTITY.hasKey());
 assertEquals(KEY1, ENTITY.getKey());
 assertEquals("bar", ENTITY.getString("foo"));
}

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

/**
 * Return the user with the given id.
 */
User getUser(String id) {
 Entity entity = datastore.get(keyFactory.newKey(id));
 return entity == null
   ? null
   : new User(entity.getString("id"), entity.getString("name"), entity.getString("email"));
}

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

@Test
public void testGetArrayNoDeferredResults() {
 datastore.put(ENTITY3);
 Iterator<Entity> result =
   datastore.fetch(KEY1, Key.newBuilder(KEY1).setName("bla").build(), KEY2, KEY3).iterator();
 assertEquals(ENTITY1, result.next());
 assertNull(result.next());
 assertEquals(ENTITY2, result.next());
 Entity entity3 = result.next();
 assertEquals(ENTITY3, entity3);
 assertTrue(entity3.isNull("null"));
 assertFalse(entity3.getBoolean("bool"));
 assertEquals(LIST_VALUE2.get(), entity3.getList("list"));
 FullEntity<IncompleteKey> partial1 = entity3.getEntity("partial1");
 FullEntity<IncompleteKey> partial2 = entity3.getEntity("partial2");
 assertEquals(PARTIAL_ENTITY2, partial1);
 assertEquals(ENTITY2, partial2);
 assertEquals(ValueType.BOOLEAN, entity3.getValue("bool").getType());
 assertEquals(LAT_LNG_VALUE, entity3.getValue("latLng"));
 assertEquals(EMPTY_LIST_VALUE, entity3.getValue("emptyList"));
 assertEquals(8, entity3.getNames().size());
 assertFalse(entity3.contains("bla"));
 try {
  entity3.getString("str");
  fail("Expecting a failure");
 } catch (DatastoreException expected) {
  // expected - no such property
 }
 assertFalse(result.hasNext());
}

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

@Test
public void testGetArrayNoDeferredResults() {
 DATASTORE.put(ENTITY3);
 Iterator<Entity> result =
   DATASTORE.fetch(KEY1, Key.newBuilder(KEY1).setName("bla").build(), KEY2, KEY3).iterator();
 assertEquals(ENTITY1, result.next());
 assertNull(result.next());
 assertEquals(ENTITY2, result.next());
 Entity entity3 = result.next();
 assertEquals(ENTITY3, entity3);
 assertTrue(entity3.isNull("null"));
 assertFalse(entity3.getBoolean("bool"));
 assertEquals(LIST_VALUE2.get(), entity3.getList("list"));
 FullEntity<IncompleteKey> partial1 = entity3.getEntity("partial1");
 FullEntity<IncompleteKey> partial2 = entity3.getEntity("partial2");
 assertEquals(PARTIAL_ENTITY2, partial1);
 assertEquals(ENTITY2, partial2);
 assertEquals(ValueType.BOOLEAN, entity3.getValue("bool").getType());
 assertEquals(LAT_LNG_VALUE, entity3.getValue("latLng"));
 assertEquals(EMPTY_LIST_VALUE, entity3.getValue("emptyList"));
 assertEquals(8, entity3.getNames().size());
 assertFalse(entity3.contains("bla"));
 try {
  entity3.getString("str");
  fail("Expecting a failure");
 } catch (DatastoreException expected) {
  // expected - no such property
 }
 assertFalse(result.hasNext());
}

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

/**
 * Return a list of all users.
 */
public List<User> getAllUsers() {
 Query<Entity> query =
   Query.newGqlQueryBuilder(Query.ResultType.ENTITY, "SELECT * FROM " + kind).build();
 QueryResults<Entity> results = datastore.run(query);
 List<User> users = new ArrayList<>();
 while (results.hasNext()) {
  Entity result = results.next();
  users.add(
    new User(result.getString("id"), result.getString("name"), result.getString("email")));
 }
 return users;
}

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

/**
 * Converts a list of task entities to a list of formatted task strings.
 *
 * @param tasks An iterator over task entities
 * @return A list of tasks strings, one per entity
 */
static List<String> formatTasks(Iterator<Entity> tasks) {
 List<String> strings = new ArrayList<>();
 while (tasks.hasNext()) {
  Entity task = tasks.next();
  if (task.getBoolean("done")) {
   strings.add(
     String.format("%d : %s (done)", task.getKey().getId(), task.getString("description")));
  } else {
   strings.add(String.format("%d : %s (created %s)", task.getKey().getId(),
     task.getString("description"), task.getTimestamp("created")));
  }
 }
 return strings;
}

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

while (results.hasNext()) {
 Entity currentEntity = results.next();
 System.out.println(currentEntity.getString("name") + ", you're invited to a pizza party!");

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

public static void main(String... args) throws Exception {
  // Instantiates a client
  Datastore datastore = DatastoreOptions.getDefaultInstance().getService();

  // The kind for the new entity
  String kind = "Task";
  // The name/ID for the new entity
  String name = "sampletask1";
  // The Cloud Datastore key for the new entity
  Key taskKey = datastore.newKeyFactory().setKind(kind).newKey(name);

  // Prepares the new entity
  Entity task = Entity.newBuilder(taskKey)
    .set("description", "Buy milk")
    .build();

  // Saves the entity
  datastore.put(task);

  System.out.printf("Saved %s: %s%n", task.getKey().getName(), task.getString("description"));

  //Retrieve entity
  Entity retrieved = datastore.get(taskKey);

  System.out.printf("Retrieved %s: %s%n", taskKey.getName(), retrieved.getString("description"));

 }
}

代码示例来源：origin: stackoverflow.com

Query<Entity> query = Query.gqlQueryBuilder(Query.ResultType.ENTITY,             
             "SELECT * FROM " + kind + " WHERE num < @num")
           .setBinding("num", 100)
           .build();
QueryResults<Entity> results = datastore.run(query);
while (results.hasNext()) {
  Entity result = results.next();
  myList.add(result.getString("num"));
...

代码示例来源：origin: spotify/styx

private WorkflowInstance parseWorkflowInstance(Entity activeWorkflowInstance) {
 final String componentId = activeWorkflowInstance.getString(PROPERTY_COMPONENT);
 final String workflowId = activeWorkflowInstance.getString(PROPERTY_WORKFLOW);
 final String parameter = activeWorkflowInstance.getString(PROPERTY_PARAMETER);
 return WorkflowInstance.create(WorkflowId.create(componentId, workflowId), parameter);
}

代码示例来源：origin: spotify/styx

static <T> Optional<T> readOptJson(Entity entity, String property, Class<T> cls) throws IOException {
 return entity.contains(property)
   ? Optional.of(OBJECT_MAPPER.readValue(entity.getString(property), cls))
   : Optional.empty();
}

代码示例来源：origin: spotify/styx

static <T> Optional<T> readOptJson(Entity entity, String property, TypeReference valueTypeRef)
  throws IOException {
 return entity.contains(property)
   ? Optional.of(OBJECT_MAPPER.readValue(entity.getString(property), valueTypeRef))
   : Optional.empty();
}

代码示例来源：origin: org.togglz/togglz-cloud-datastore

private String getStrategyId(Entity featureEntity) {
  if (featureEntity.contains(STRATEGY_ID)) {
    final String strategyId = featureEntity.getString(STRATEGY_ID);
    if (!Strings.isNullOrEmpty(strategyId)) {
      return strategyId.trim();
    }
  }
  return null;
}

代码示例来源：origin: spotify/styx

static Workflow parseWorkflowJson(Entity entity, WorkflowId workflowId) throws IOException {
 try {
  return OBJECT_MAPPER
    .readValue(entity.getString(PROPERTY_WORKFLOW_JSON), Workflow.class);
 } catch (IOException e) {
  LOG.error("Failed to read workflow for {}, {}", workflowId.componentId(), workflowId.id(), e);
  throw e;
 }
}

代码示例来源：origin: spotify/styx

private List<Workflow> getBatchOfWorkflows(final List<WorkflowId> batch) throws IOException {
 final List<Key> keys = batch.stream()
   .map(workflowId -> workflowKey(datastore.newKeyFactory(), workflowId))
   .collect(toList());
 final List<Workflow> workflows = new ArrayList<>();
 datastore.get(keys, entity -> {
  try {
   workflows.add(OBJECT_MAPPER.readValue(entity.getString(PROPERTY_WORKFLOW_JSON), Workflow.class));
  } catch (IOException e) {
   LOG.warn("Failed to read workflow {}.", entity.getKey(), e);
  }
 });
 return workflows;
}

代码示例来源：origin: spotify/styx

public Map<WorkflowId, Workflow> workflows() throws IOException {
 final Map<WorkflowId, Workflow> map = Maps.newHashMap();
 final EntityQuery query = Query.newEntityQueryBuilder().setKind(KIND_WORKFLOW).build();
 datastore.query(query, entity -> {
  final Workflow workflow;
  try {
   workflow = OBJECT_MAPPER.readValue(entity.getString(PROPERTY_WORKFLOW_JSON), Workflow.class);
  } catch (IOException e) {
   LOG.warn("Failed to read workflow {}.", entity.getKey(), e);
   return;
  }
  map.put(workflow.id(), workflow);
 });
 return map;
}

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