samples: add new sample bigquery_load_from_file (#209)

* samples: add new sample bigquery_load_from_file

* updates

* update to try w multiple resources

* update to try w multiple resources
move unhelpful exceptions to method signature

* add comment

Co-Authored-By: Kurtis Van Gent <31518063+kurtisvg@users.noreply.github.com>

* nit - remove extra semicolon

Co-authored-by: Kurtis Van Gent <31518063+kurtisvg@users.noreply.github.com>

samples/src/main/java/com/example/bigquery/LoadLocalFile.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;
+
+// [START bigquery_load_from_file]
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.FormatOptions;
+import com.google.cloud.bigquery.Job;
+import com.google.cloud.bigquery.JobId;
+import com.google.cloud.bigquery.JobStatistics.LoadStatistics;
+import com.google.cloud.bigquery.TableDataWriteChannel;
+import com.google.cloud.bigquery.TableId;
+import com.google.cloud.bigquery.WriteChannelConfiguration;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.channels.Channels;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.UUID;
+
+public class LoadLocalFile {
+
+  public static void runLoadLocalFile() throws IOException, InterruptedException {
+    String datasetName = "MY_DATASET_NAME";
+    String tableName = "MY_TABLE_NAME";
+    Path csvPath = FileSystems.getDefault().getPath(".", "my-data.csv");
+    loadLocalFile(datasetName, tableName, csvPath);
+  }
+
+  public static void loadLocalFile(String datasetName, String tableName, Path csvPath)
+      throws IOException, 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();
+      TableId tableId = TableId.of(datasetName, tableName);
+
+      WriteChannelConfiguration writeChannelConfiguration =
+          WriteChannelConfiguration.newBuilder(tableId)
+              .setFormatOptions(FormatOptions.csv())
+              .build();
+
+      // The location and JobName must be specified; other fields can be auto-detected.
+      String jobName = "jobId_" + UUID.randomUUID().toString();
+      JobId jobId = JobId.newBuilder().setLocation("us").setJob(jobName).build();
+
+      // Imports a local file into a table.
+      try (TableDataWriteChannel writer = bigquery.writer(jobId, writeChannelConfiguration);
+          OutputStream stream = Channels.newOutputStream(writer)) {
+        Files.copy(csvPath, stream);
+      }
+
+      // Get the Job created by the TableDataWriteChannel and wait for it to complete.
+      Job job = bigquery.getJob(jobId);
+      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 load local file to the table due to an error: \n"
+                + job.getStatus().getError());
+        return;
+      }
+
+      // Get output status
+      LoadStatistics stats = job.getStatistics();
+      System.out.printf("Successfully loaded %d rows. \n", stats.getOutputRows());
+    } catch (BigQueryException e) {
+      System.out.println("Local file not loaded. \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_load_from_file]

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

@@ -0,0 +1,86 @@
+/*
+ * 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.LegacySQLTypeName;
+import com.google.cloud.bigquery.Schema;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.nio.file.FileSystems;
+import java.nio.file.Path;
+import java.util.UUID;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class LoadLocalFileIT {
+  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);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void loadLocalFile() throws IOException, InterruptedException {
+    String tableName = "LoadLocalFileTestTable_" + UUID.randomUUID().toString().replace('-', '_');
+    Schema schema =
+        Schema.of(
+            Field.of("Name", LegacySQLTypeName.STRING),
+            Field.of("Age", LegacySQLTypeName.NUMERIC),
+            Field.of("Weight", LegacySQLTypeName.NUMERIC),
+            Field.of("IsMagic", LegacySQLTypeName.BOOLEAN));
+
+    CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, schema);
+
+    Path csvPath = FileSystems.getDefault().getPath("src/test/resources", "bigquery_noheader.csv");
+
+    LoadLocalFile.loadLocalFile(BIGQUERY_DATASET_NAME, tableName, csvPath);
+
+    assertThat(bout.toString()).contains("Successfully loaded");
+
+    // Clean up
+    DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
+  }
+}

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

@@ -21,6 +21,7 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
+import java.util.UUID;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.BeforeClass;
@@ -59,7 +60,8 @@ public void tearDown() {
   public void loadPartitionedTable() throws Exception {
     String sourceUri = "gs://cloud-samples-data/bigquery/us-states/us-states-by-date-no-header.csv";
 
-    String tableName = "LOAD_PARTITIONED_TABLE_TEST";
+    String tableName =
+        "LOAD_PARTITIONED_TABLE_TEST_" + UUID.randomUUID().toString().replace('-', '_');
 
     LoadPartitionedTable.loadPartitionedTable(BIGQUERY_DATASET_NAME, tableName, sourceUri);