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docs(samples): add query script (#605)
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Praful Makani committed Jul 27, 2020
1 parent 0abdd90 commit ca073025b8d156bf9e76656fb36f49a5f81927c9
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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_script]
import com.google.api.gax.paging.Page;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Job;
import com.google.cloud.bigquery.JobInfo;
import com.google.cloud.bigquery.QueryJobConfiguration;

// Sample to run query script.
public class QueryScript {

public static void runQueryScript() {
String script =
"-- Declare a variable to hold names as an array.\n"
+ "DECLARE top_names ARRAY<STRING>;\n"
+ "-- Build an array of the top 100 names from the year 2017.\n"
+ "SET top_names = (\n"
+ " SELECT ARRAY_AGG(name ORDER BY number DESC LIMIT 100)\n"
+ " FROM `bigquery-public-data`.usa_names.usa_1910_current\n"
+ " WHERE year = 2017\n"
+ ");\n"
+ "-- Which names appear as words in Shakespeare's plays?\n"
+ "SELECT\n"
+ " name AS shakespeare_name\n"
+ "FROM UNNEST(top_names) AS name\n"
+ "WHERE name IN (\n"
+ " SELECT word\n"
+ " FROM `bigquery-public-data`.samples.shakespeare\n"
+ ");";
queryScript(script);
}

public static void queryScript(String script) {
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();

QueryJobConfiguration queryConfig = QueryJobConfiguration.newBuilder(script).build();
Job createJob = bigquery.create(JobInfo.of(queryConfig));
// Wait for the whole script to finish.
JobInfo jobInfo = createJob.waitFor();
String parentJobId = jobInfo.getJobId().getJob();

// Fetch jobs created by the SQL script.
Page<Job> childJobs = bigquery.listJobs(BigQuery.JobListOption.parentJobId(parentJobId));
childJobs
.iterateAll()
.forEach(job -> System.out.printf("Child Job Id: ", job.getJobId().getJob()));

System.out.println("Query script performed successfully.");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Query not performed \n" + e.toString());
}
}
}
// [END bigquery_query_script]
@@ -0,0 +1,67 @@
/*
* 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 java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class QueryScriptIT {

private ByteArrayOutputStream bout;
private PrintStream out;

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

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

@Test
public void testQueryScript() {
String script =
"-- Declare a variable to hold names as an array.\n"
+ "DECLARE top_names ARRAY<STRING>;\n"
+ "-- Build an array of the top 100 names from the year 2017.\n"
+ "SET top_names = (\n"
+ " SELECT ARRAY_AGG(name ORDER BY number DESC LIMIT 100)\n"
+ " FROM `bigquery-public-data`.usa_names.usa_1910_current\n"
+ " WHERE year = 2017\n"
+ ");\n"
+ "-- Which names appear as words in Shakespeare's plays?\n"
+ "SELECT\n"
+ " name AS shakespeare_name\n"
+ "FROM UNNEST(top_names) AS name\n"
+ "WHERE name IN (\n"
+ " SELECT word\n"
+ " FROM `bigquery-public-data`.samples.shakespeare\n"
+ ");";

QueryScript.queryScript(script);
assertThat(bout.toString()).contains("Query script performed successfully.");
}
}

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