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docs(samples): adding destination query sample and test (#418)
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ejdarrow committed Jun 4, 2020
1 parent 59426df commit 0f50961aaf1092f3ecc4e02fa9cebb50f6d45e90
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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_query_destination_table]
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.QueryJobConfiguration;
import com.google.cloud.bigquery.TableId;

public class SaveQueryToTable {

public static void runSaveQueryToTable() {
// TODO(developer): Replace these variables before running the sample.
String query =
"SELECT corpus FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus;";
String destinationTable = "MY_TABLE";
String destinationDataset = "MY_DATASET";

saveQueryToTable(destinationDataset, destinationTable, query);
}

public static void saveQueryToTable(String destinationDataset,
String destinationTableId, String query) {
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();

// Identify the destination table
TableId destinationTable = TableId.of(destinationDataset, destinationTableId);

// Build the query job
QueryJobConfiguration queryConfig =
QueryJobConfiguration.newBuilder(query).setDestinationTable(destinationTable).build();

// Execute the query.
bigquery.query(queryConfig);

// The results are now saved in the destination table.

System.out.println("Saved query ran successfully");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Saved query did not run \n" + e.toString());
}
}
}
// [END bigquery_query_destination_table]
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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;

import static com.google.common.truth.Truth.assertThat;
import static junit.framework.TestCase.assertNotNull;

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 SaveQueryToTableIT {
private ByteArrayOutputStream bout;
private PrintStream out;


private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");

private static void requireEnvVar(String varName) {
assertNotNull(
"Environment variable " + varName + " is required to perform these tests.",
System.getenv(varName));
}

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

@Before
public void setUp() {
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}

@After
public void tearDown() {
System.setOut(null);
}

@Test
public void testSaveQueryToTable() {
String tableName = "MY_TABLE_NAME_" + UUID.randomUUID().toString().replace("-", "_");
String query =
"SELECT corpus FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus;";

SaveQueryToTable.saveQueryToTable(BIGQUERY_DATASET_NAME, tableName, query);

assertThat(bout.toString()).contains("Saved query ran successfully");

// Clean up
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
}
}

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