feat: new sample - Tables: Copy multiple tables (#76)

* feat: new sample - Tables: Copy multiple tables

b/147141782

* update test to create new destination table for each test since existing table cannot be overwritten and would throw bigquery error

* add env vars for sample test builds

* update testing var names

* format code

Author: stephaniewang526

.kokoro/run_samples_tests.sh

@@ -30,7 +30,10 @@ mvn -v
 # Setup required env variables
 export GOOGLE_CLOUD_PROJECT=java-docs-samples-testing
 export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-acct.json
+export BIGQUERY_DATASET_NAME=bigquery_test_dataset
 export GCS_BUCKET=java-docs-samples-testing
+export BIGQUERY_TABLE1=table1
+export BIGQUERY_TABLE2=table2
 
 # Activate service account
 gcloud auth activate-service-account \

samples/src/main/java/com/example/bigquery/CopyMultipleTables.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2019 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_copy_table_multiple_source]
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.CopyJobConfiguration;
+import com.google.cloud.bigquery.Job;
+import com.google.cloud.bigquery.JobInfo;
+import com.google.cloud.bigquery.TableId;
+import java.util.Arrays;
+
+public class CopyMultipleTables {
+
+  public static void runCopyMultipleTables() {
+    // TODO(developer): Replace these variables before running the sample.
+    String destinationDatasetName = "MY_DATASET_NAME";
+    String destinationTableId = "MY_TABLE_NAME";
+    copyMultipleTables(destinationDatasetName, destinationTableId);
+  }
+
+  public static void copyMultipleTables(String destinationDatasetName, String destinationTableId) {
+    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();
+
+      TableId destinationTable = TableId.of(destinationDatasetName, destinationTableId);
+
+      // For more information on CopyJobConfiguration see:
+      // https://googleapis.dev/java/google-cloud-clients/latest/com/google/cloud/bigquery/JobConfiguration.html
+      CopyJobConfiguration configuration =
+          CopyJobConfiguration.newBuilder(
+                  destinationTable,
+                  Arrays.asList(
+                      TableId.of(destinationDatasetName, "table1"),
+                      TableId.of(destinationDatasetName, "table2")))
+              .build();
+
+      // For more information on Job see:
+      // https://googleapis.dev/java/google-cloud-clients/latest/index.html?com/google/cloud/bigquery/package-summary.html
+      Job job = bigquery.create(JobInfo.of(configuration));
+
+      // Blocks until this job completes its execution, either failing or succeeding.
+      Job completedJob = job.waitFor();
+      if (completedJob == null) {
+        System.out.println("Job not executed since it no longer exists.");
+        return;
+      } else if (completedJob.getStatus().getError() != null) {
+        System.out.println(
+            "BigQuery was unable to copy tables due to an error: \n" + job.getStatus().getError());
+        return;
+      }
+      System.out.println("Table copied successfully.");
+    } catch (BigQueryException | InterruptedException e) {
+      System.out.println("Table copying job was interrupted. \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_copy_table_multiple_source]

samples/src/test/java/com/example/bigquery/CopyMultipleTablesIT.java

@@ -0,0 +1,73 @@
+/*
+ * 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.UUID;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class CopyMultipleTablesIT {
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");
+  private static final String BIGQUERY_TABLE1 = System.getenv("BIGQUERY_TABLE1");
+  private static final String BIGQUERY_TABLE2 = System.getenv("BIGQUERY_TABLE2");
+
+  private static void requireEnvVar(String varName) {
+    assertNotNull(
+        "Environment variable " + varName + " is required to perform these tests.",
+        System.getenv(varName));
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("BIGQUERY_DATASET_NAME");
+    requireEnvVar("BIGQUERY_TABLE1");
+    requireEnvVar("BIGQUERY_TABLE2");
+  }
+
+  @Before
+  public void setUp() throws Exception {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void testCopyMultipleTables() {
+    // Create a new destination table for each test since existing table cannot be overwritten
+    String generatedTableName =
+        "gcloud_test_table_temp_" + UUID.randomUUID().toString().replace('-', '_');
+    CreateTable.createTable(BIGQUERY_DATASET_NAME, generatedTableName, null);
+
+    CopyMultipleTables.copyMultipleTables(BIGQUERY_DATASET_NAME, generatedTableName);
+    assertThat(bout.toString()).contains("Table copied successfully.");
+  }
+}

samples/src/test/java/com/example/bigquery/ExtractTableToJsonIT.java

@@ -61,7 +61,6 @@ public void testExtractTableToJson() {
     String datasetName = "samples";
     String tableName = "shakespeare";
     String destinationUri = "gs://" + GCS_BUCKET + "/extractTest.csv";
-    System.out.println(destinationUri);
 
     // Extract table content to GCS in CSV format
     ExtractTableToJson.extractTableToJson(projectId, datasetName, tableName, destinationUri);