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docs(samples): add get table labels (#540)
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Praful Makani
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samples/snippets/src/main/java/com/example/bigquery/GetTableLabels.java
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/* | ||
* Copyright 2020 Google LLC | ||
* | ||
* 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. | ||
*/ | ||
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package com.example.bigquery; | ||
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// [START bigquery_get_table_labels] | ||
import com.google.cloud.bigquery.BigQuery; | ||
import com.google.cloud.bigquery.BigQueryException; | ||
import com.google.cloud.bigquery.BigQueryOptions; | ||
import com.google.cloud.bigquery.Table; | ||
import com.google.cloud.bigquery.TableId; | ||
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// Sample to get table labels | ||
public class GetTableLabels { | ||
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public static void runGetTableLabels() { | ||
// TODO(developer): Replace these variables before running the sample. | ||
String datasetName = "MY_DATASET_NAME"; | ||
String tableName = "MY_TABLE_NAME"; | ||
getTableLabels(datasetName, tableName); | ||
} | ||
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public static void getTableLabels(String datasetName, String tableName) { | ||
try { | ||
// Initialize client that will be used to send requests. This client only needs to be created | ||
// once, and can be reused for multiple requests. | ||
BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService(); | ||
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// This example table starts with existing label { color: 'green' } | ||
Table table = bigquery.getTable(TableId.of(datasetName, tableName)); | ||
table | ||
.getLabels() | ||
.forEach((key, value) -> System.out.println("Retrieved labels successfully")); | ||
} catch (BigQueryException e) { | ||
System.out.println("Label was not deleted. \n" + e.toString()); | ||
} | ||
} | ||
} | ||
// [END bigquery_get_table_labels] |
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samples/snippets/src/test/java/com/example/bigquery/GetTableLabelsIT.java
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package com.example.bigquery; | ||
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import static com.google.common.truth.Truth.assertThat; | ||
import static org.junit.Assert.assertNotNull; | ||
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import com.google.cloud.bigquery.Schema; | ||
import java.io.ByteArrayOutputStream; | ||
import java.io.PrintStream; | ||
import java.util.UUID; | ||
import org.junit.After; | ||
import org.junit.Before; | ||
import org.junit.BeforeClass; | ||
import org.junit.Test; | ||
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public class GetTableLabelsIT { | ||
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private String tableName; | ||
private ByteArrayOutputStream bout; | ||
private PrintStream out; | ||
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private static final String BIGQUERY_DATASET_NAME = requireEnvVar("BIGQUERY_DATASET_NAME"); | ||
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private static String requireEnvVar(String varName) { | ||
String value = System.getenv(varName); | ||
assertNotNull( | ||
"Environment variable " + varName + " is required to perform these tests.", | ||
System.getenv(varName)); | ||
return value; | ||
} | ||
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@BeforeClass | ||
public static void checkRequirements() { | ||
requireEnvVar("BIGQUERY_DATASET_NAME"); | ||
} | ||
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@Before | ||
public void setUp() { | ||
bout = new ByteArrayOutputStream(); | ||
out = new PrintStream(bout); | ||
System.setOut(out); | ||
// create a temporary table | ||
tableName = "MY_TABLE_TEST_" + UUID.randomUUID().toString().substring(0, 8); | ||
CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, Schema.of()); | ||
// add label on a table | ||
LabelTable.labelTable(BIGQUERY_DATASET_NAME, tableName); | ||
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bout = new ByteArrayOutputStream(); | ||
out = new PrintStream(bout); | ||
System.setOut(out); | ||
} | ||
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@After | ||
public void tearDown() { | ||
// delete a temporary table | ||
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName); | ||
System.setOut(null); | ||
} | ||
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@Test | ||
public void testGetTableLabels() { | ||
GetTableLabels.getTableLabels(BIGQUERY_DATASET_NAME, tableName); | ||
assertThat(bout.toString()).contains("Retrieved labels successfully"); | ||
} | ||
} |