diff --git a/samples/snippets/src/main/java/com/example/bigquery/QueryScript.java b/samples/snippets/src/main/java/com/example/bigquery/QueryScript.java new file mode 100644 index 000000000..c9da185f5 --- /dev/null +++ b/samples/snippets/src/main/java/com/example/bigquery/QueryScript.java @@ -0,0 +1,76 @@ +/* + * 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;\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 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] diff --git a/samples/snippets/src/test/java/com/example/bigquery/QueryScriptIT.java b/samples/snippets/src/test/java/com/example/bigquery/QueryScriptIT.java new file mode 100644 index 000000000..c2c5ca390 --- /dev/null +++ b/samples/snippets/src/test/java/com/example/bigquery/QueryScriptIT.java @@ -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;\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."); + } +}