docs(samples): add insert rows without rowids in a table (#573)

* docs(samples): add insert rows without rowids in a table

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Co-authored-by: Stephanie Wang <stephaniewang526@users.noreply.github.com>

Author: Praful Makani

samples/snippets/src/main/java/com/example/bigquery/TableInsertRowsWithoutRowIds.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.
+ */
+
+package com.example.bigquery;
+
+// [START bigquery_table_insert_rows_explicit_none_insert_ids]
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryError;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.InsertAllRequest;
+import com.google.cloud.bigquery.InsertAllResponse;
+import com.google.cloud.bigquery.TableId;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+// Sample to insert rows without row ids in a table
+public class TableInsertRowsWithoutRowIds {
+
+  public static void runTableInsertRowsWithoutRowIds() {
+    // TODO(developer): Replace these variables before running the sample.
+    String datasetName = "MY_DATASET_NAME";
+    String tableName = "MY_TABLE_NAME";
+    // Create rows to insert
+    Map<String, Object> rowContent1 = new HashMap<>();
+    rowContent1.put("stringField", "Phred Phlyntstone");
+    rowContent1.put("numericField", 32);
+    Map<String, Object> rowContent2 = new HashMap<>();
+    rowContent2.put("stringField", "Wylma Phlyntstone");
+    rowContent2.put("numericField", 29);
+    List<InsertAllRequest.RowToInsert> rowContent = new ArrayList<>();
+    // insertId is null if not specified
+    rowContent.add(InsertAllRequest.RowToInsert.of(rowContent1));
+    rowContent.add(InsertAllRequest.RowToInsert.of(rowContent2));
+    tableInsertRowsWithoutRowIds(datasetName, tableName, rowContent);
+  }
+
+  public static void tableInsertRowsWithoutRowIds(
+      String datasetName, String tableName, Iterable<InsertAllRequest.RowToInsert> rows) {
+    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();
+
+      // Get table
+      TableId tableId = TableId.of(datasetName, tableName);
+
+      // Inserts rowContent into datasetName:tableId.
+      InsertAllResponse response =
+          bigquery.insertAll(InsertAllRequest.newBuilder(tableId).setRows(rows).build());
+
+      if (response.hasErrors()) {
+        // If any of the insertions failed, this lets you inspect the errors
+        for (Map.Entry<Long, List<BigQueryError>> entry : response.getInsertErrors().entrySet()) {
+          System.out.println("Response error: \n" + entry.getValue());
+        }
+      }
+      System.out.println("Rows successfully inserted into table without row ids");
+    } catch (BigQueryException e) {
+      System.out.println("Insert operation not performed \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_table_insert_rows_explicit_none_insert_ids]

samples/snippets/src/test/java/com/example/bigquery/TableInsertRowsWithoutRowIdsIT.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.
+ */
+
+package com.example.bigquery;
+
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.TestCase.assertNotNull;
+
+import com.google.cloud.bigquery.Field;
+import com.google.cloud.bigquery.InsertAllRequest;
+import com.google.cloud.bigquery.LegacySQLTypeName;
+import com.google.cloud.bigquery.Schema;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class TableInsertRowsWithoutRowIdsIT {
+
+  private String tableName;
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");
+
+  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");
+  }
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+
+    tableName = "INSERT_ROW_WITHOUT_ROW_ID_TEST" + UUID.randomUUID().toString().substring(0, 8);
+    Schema schema =
+        Schema.of(
+            Field.of("stringField", LegacySQLTypeName.STRING),
+            Field.of("numericField", LegacySQLTypeName.NUMERIC));
+
+    // Create table in dataset for testing
+    CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, schema);
+
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    // Clean up
+    DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
+    System.setOut(null);
+  }
+
+  @Test
+  public void testTableInsertRowsWithoutRowIds() {
+    // Create rows to insert
+    Map<String, Object> rowContent1 = new HashMap<>();
+    rowContent1.put("stringField", "Phred Phlyntstone");
+    rowContent1.put("numericField", 32);
+    Map<String, Object> rowContent2 = new HashMap<>();
+    rowContent2.put("stringField", "Wylma Phlyntstone");
+    rowContent2.put("numericField", 29);
+    List<InsertAllRequest.RowToInsert> rowContent = new ArrayList<>();
+    rowContent.add(InsertAllRequest.RowToInsert.of(rowContent1));
+    rowContent.add(InsertAllRequest.RowToInsert.of(rowContent2));
+    TableInsertRowsWithoutRowIds.tableInsertRowsWithoutRowIds(
+        BIGQUERY_DATASET_NAME, tableName, rowContent);
+    assertThat(bout.toString()).contains("Rows successfully inserted into table without row ids");
+  }
+}