diff --git a/samples/snippets/src/main/java/com/example/bigquery/QueryDryRun.java b/samples/snippets/src/main/java/com/example/bigquery/QueryDryRun.java new file mode 100644 index 000000000..7a72de1de --- /dev/null +++ b/samples/snippets/src/main/java/com/example/bigquery/QueryDryRun.java @@ -0,0 +1,59 @@ +/* + * 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_dry_run] +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.JobStatistics; +import com.google.cloud.bigquery.QueryJobConfiguration; + +// Sample to run dry query on the table +public class QueryDryRun { + + public static void runQueryDryRun() { + String query = + "SELECT name, COUNT(*) as name_count " + + "FROM `bigquery-public-data.usa_names.usa_1910_2013` " + + "WHERE state = 'WA' " + + "GROUP BY name"; + queryDryRun(query); + } + + public static void queryDryRun(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(); + + QueryJobConfiguration queryConfig = + QueryJobConfiguration.newBuilder(query).setDryRun(true).setUseQueryCache(false).build(); + + Job job = bigquery.create(JobInfo.of(queryConfig)); + JobStatistics.QueryStatistics statistics = job.getStatistics(); + + System.out.println( + "Query dry run performed successfully." + statistics.getTotalBytesProcessed()); + } catch (BigQueryException e) { + System.out.println("Query not performed \n" + e.toString()); + } + } +} +// [END bigquery_query_dry_run] diff --git a/samples/snippets/src/test/java/com/example/bigquery/QueryDryRunIT.java b/samples/snippets/src/test/java/com/example/bigquery/QueryDryRunIT.java new file mode 100644 index 000000000..0b710b19a --- /dev/null +++ b/samples/snippets/src/test/java/com/example/bigquery/QueryDryRunIT.java @@ -0,0 +1,55 @@ +/* + * 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 QueryDryRunIT { + + 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 testQueryDryRun() { + String query = + "SELECT name, COUNT(*) as name_count " + + "FROM `bigquery-public-data.usa_names.usa_1910_2013` " + + "WHERE state = 'WA' " + + "GROUP BY name"; + + QueryDryRun.queryDryRun(query); + assertThat(bout.toString()).contains("Query dry run performed successfully."); + } +}