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docs(samples): add load CSV from GCS sample (#426)
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stephaniewang526 committed Jun 8, 2020
1 parent 342573a commit 3810366451097a7f14db11504103865540ac242a
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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_load_table_gcs_csv]
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.Table;

// Sample to load CSV data from Cloud Storage into a new BigQuery table
public class LoadCsvFromGcs {

public static void runLoadCsvFromGcs() throws Exception {
// TODO(developer): Replace these variables before running the sample.
String datasetName = "MY_DATASET_NAME";
String tableName = "MY_TABLE_NAME";
String sourceUri = "gs://cloud-samples-data/bigquery/us-states/us-states.csv";
loadCsvFromGcs(datasetName, tableName, sourceUri);
}

public static void loadCsvFromGcs(String datasetName, String tableName, String sourceUri)
throws Exception {
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();

Table table = bigquery.getTable(datasetName, tableName);
Job loadJob = table.load(FormatOptions.csv(), sourceUri);

// Load data from a GCS parquet file into the table
// Blocks until this load table job completes its execution, either failing or succeeding.
Job completedJob = loadJob.waitFor();

// Check for errors
if (completedJob == null) {
throw new Exception("Job not executed since it no longer exists.");
} else if (completedJob.getStatus().getError() != null) {
// You can also look at queryJob.getStatus().getExecutionErrors() for all
// errors, not just the latest one.
throw new Exception(
"BigQuery was unable to load into the table due to an error: \n"
+ loadJob.getStatus().getError());
}
System.out.println("CSV from GCS successfully added during load append job");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Column not added during load append \n" + e.toString());
}
}
}
// [END bigquery_load_table_gcs_csv]
@@ -0,0 +1,88 @@
/*
* 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.PrintStream;
import java.util.UUID;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

public class LoadCsvFromGcsIT {

private String tableName;
private ByteArrayOutputStream bout;
private PrintStream out;

private static final String BIGQUERY_DATASET_NAME = requireEnvVar("BIGQUERY_DATASET_NAME");

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("BIGQUERY_DATASET_NAME");
}

@Before
public void setUp() {
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);

// Create a test table
tableName = "loadCsvFromGcs_TEST_" + UUID.randomUUID().toString().replace('-', '_');

Schema schema =
Schema.of(
Field.of("name", LegacySQLTypeName.STRING),
Field.of("post_abbr", LegacySQLTypeName.STRING));

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 loadCsvFromGcs() throws Exception {
String sourceUri = "gs://cloud-samples-data/bigquery/us-states/us-states.csv";
LoadCsvFromGcs.loadCsvFromGcs(BIGQUERY_DATASET_NAME, tableName, sourceUri);
assertThat(bout.toString()).contains("CSV from GCS successfully added during load append job");
}
}

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