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docs(samples): add get table labels (#540)
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Praful Makani committed Jul 13, 2020
1 parent 563157c commit a6d94913f74a6b4d29e9314a0652a9e3fa30aed9
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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.
*/

package com.example.bigquery;

// [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;

// Sample to get table labels
public class GetTableLabels {

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);
}

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();

// 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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package com.example.bigquery;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertNotNull;

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;

public class GetTableLabelsIT {

private String tableName;
private ByteArrayOutputStream bout;
private PrintStream out;

private static final String BIGQUERY_DATASET_NAME = requireEnvVar("BIGQUERY_DATASET_NAME");

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;
}

@BeforeClass
public static void checkRequirements() {
requireEnvVar("BIGQUERY_DATASET_NAME");
}

@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);

bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}

@After
public void tearDown() {
// delete a temporary table
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
System.setOut(null);
}

@Test
public void testGetTableLabels() {
GetTableLabels.getTableLabels(BIGQUERY_DATASET_NAME, tableName);
assertThat(bout.toString()).contains("Retrieved labels successfully");
}
}

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