docs(samples): add export query results to Amazon S3 sample and IT

samples/snippets/src/main/java/com/example/bigquery/ExportQueryResultsToS3.java

@@ -0,0 +1,65 @@
+/*
+ * 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_omni_export_query_result_to_s3]
+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.TableResult;
+
+// Sample to queries an external data source aws s3 using a permanent table
+public class ExportQueryResultsToS3 {
+
+  public static void main(String[] args) throws InterruptedException {
+    // TODO(developer): Replace these variables before running the sample.
+    String projectId = "MY_PROJECT_ID";
+    String datasetName = "MY_DATASET_NAME";
+    String externalTableName = "MY_EXTERNAL_TABLE_NAME";
+    // connectionName should be in the format of connection_region.connection_name. e.g.
+    // aws-us-east-1.s3-write-conn
+    String connectionName = "MY_CONNECTION_REGION.MY_CONNECTION_NAME";
+    String destinationUri = "s3://your-bucket-name/*";
+    String format = "EXPORT_FORMAT";
+    // Export result of query to find states starting with 'W'
+    String query =
+        String.format(
+            "EXPORT DATA WITH CONNECTION %s AS SELECT * FROM %s.%s.%s WHERE name LIKE 'W%%'",
+            connectionName, destinationUri, format, projectId, datasetName, externalTableName);
+    exportQueryResultsToS3(query);
+  }
+
+  public static void exportQueryResultsToS3(String query) throws InterruptedException {
+    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();
+
+      TableResult results = bigquery.query(QueryJobConfiguration.of(query));
+
+      results
+          .iterateAll()
+          .forEach(row -> row.forEach(val -> System.out.printf("%s,", val.toString())));
+
+      System.out.println("Query results exported to Amazon S3 successfully.");
+    } catch (BigQueryException e) {
+      System.out.println("Query not performed \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_omni_export_query_result_to_s3]

samples/snippets/src/main/java/com/example/bigquery/ResourceCleanUp.java

@@ -49,9 +49,9 @@ public static void main(String[] args) {
     for (Dataset dataset : datasets.getValues()) {
       String datasetName = dataset.getDatasetId().getDataset();
       if ((datasetName.contains("CREATE_DATASET_AWS_TEST_")
-              || datasetName.contains("MY_DATASET_")
-              || datasetName.contains("gcloud_test_")
-              || datasetName.contains("SHARED_DATASET_TEST_"))
+          || datasetName.contains("MY_DATASET_")
+          || datasetName.contains("gcloud_test_")
+          || datasetName.contains("SHARED_DATASET_TEST_"))
       // && dataset.getCreationTime() > sixHourAgo
       ) {
         System.out.format("\tDeleting Dataset: %s\n", datasetName);

samples/snippets/src/test/java/com/example/bigquery/CreateExternalTableAwsIT.java

@@ -37,7 +37,6 @@
 public class CreateExternalTableAwsIT {
 
   private static final String ID = UUID.randomUUID().toString().substring(0, 8);
-  private static final String LOCATION = "aws-us-east-1";
   private final Logger log = Logger.getLogger(this.getClass().getName());
   private String tableName;
   private ByteArrayOutputStream bout;

samples/snippets/src/test/java/com/example/bigquery/ExportQueryResultsToS3IT.java

@@ -0,0 +1,91 @@
+/*
+ * 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.logging.Level;
+import java.util.logging.Logger;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class ExportQueryResultsToS3IT {
+  private final Logger log = Logger.getLogger(this.getClass().getName());
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+  private PrintStream originalPrintStream;
+
+  private static final String OMNI_PROJECT_ID = requireEnvVar("OMNI_PROJECT_ID");
+  private static final String OMNI_DATASET_NAME = requireEnvVar("OMNI_DATASET_NAME");
+  private static final String OMNI_EXTERNAL_TABLE_NAME = requireEnvVar("OMNI_EXTERNAL_TABLE_NAME");
+  private static final String AWS_WRITE_CONNECTION_ID = requireEnvVar("AWS_WRITE_CONNECTION_ID");
+
+  private static String requireEnvVar(String varName) {
+    String value = System.getenv(varName);
+    assertNotNull(
+        "Environment variable " + varName + " is required to perform these tests.",
+        System.getenv(varName));
+    return value;
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("OMNI_PROJECT_ID");
+    requireEnvVar("OMNI_DATASET_NAME");
+    requireEnvVar("OMNI_EXTERNAL_TABLE_NAME");
+    requireEnvVar("AWS_WRITE_CONNECTION_ID");
+  }
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    originalPrintStream = System.out;
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    // restores print statements in the original method
+    System.out.flush();
+    System.setOut(originalPrintStream);
+    log.log(Level.INFO, bout.toString());
+  }
+
+  @Test
+  public void testQueryExternalTableAws() throws InterruptedException {
+    String destinationUri = "s3://omni-samples-test-bucket/client-lib-test*";
+    String format = "CSV";
+    String query =
+        String.format(
+            "EXPORT DATA WITH CONNECTION `%s` OPTIONS(uri='%s', format='%s') "
+                + "AS SELECT * FROM %s.%s.%s WHERE name LIKE 'W%%'",
+            AWS_WRITE_CONNECTION_ID,
+            destinationUri,
+            format,
+            OMNI_PROJECT_ID,
+            OMNI_DATASET_NAME,
+            OMNI_EXTERNAL_TABLE_NAME);
+    ExportQueryResultsToS3.exportQueryResultsToS3(query);
+    assertThat(bout.toString()).contains("Query results exported to Amazon S3 successfully.");
+  }
+}