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docs(samples): add query script (#605)
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Praful Makani
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samples/snippets/src/main/java/com/example/bigquery/QueryScript.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_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; | ||
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// Sample to run query script. | ||
public class QueryScript { | ||
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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); | ||
} | ||
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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(); | ||
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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(); | ||
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// 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())); | ||
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System.out.println("Query script performed successfully."); | ||
} catch (BigQueryException | InterruptedException e) { | ||
System.out.println("Query not performed \n" + e.toString()); | ||
} | ||
} | ||
} | ||
// [END bigquery_query_script] |
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samples/snippets/src/test/java/com/example/bigquery/QueryScriptIT.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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import static com.google.common.truth.Truth.assertThat; | ||
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import java.io.ByteArrayOutputStream; | ||
import java.io.PrintStream; | ||
import org.junit.After; | ||
import org.junit.Before; | ||
import org.junit.Test; | ||
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public class QueryScriptIT { | ||
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private ByteArrayOutputStream bout; | ||
private PrintStream out; | ||
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@Before | ||
public void setUp() { | ||
bout = new ByteArrayOutputStream(); | ||
out = new PrintStream(bout); | ||
System.setOut(out); | ||
} | ||
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@After | ||
public void tearDown() { | ||
System.setOut(null); | ||
} | ||
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@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" | ||
+ ");"; | ||
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QueryScript.queryScript(script); | ||
assertThat(bout.toString()).contains("Query script performed successfully."); | ||
} | ||
} |