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docs(samples): added copy table and accompanying test (#414)
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ejdarrow committed Jun 4, 2020
1 parent c1f21e6 commit de0d97f2f940c9cf507d19c5595e1a0e819ef19c
Showing with 165 additions and 0 deletions.
  1. +78 −0 samples/snippets/src/main/java/com/example/bigquery/CopyTable.java
  2. +87 −0 samples/snippets/src/test/java/com/example/bigquery/CopyTableIT.java
@@ -0,0 +1,78 @@
/*
* 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_copy_table]
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;

public class CopyTable {

public static void runCopyTable() {
// TODO(developer): Replace these variables before running the sample.
String destinationDatasetName = "MY_DESTINATION_DATASET_NAME";
String destinationTableId = "MY_DESTINATION_TABLE_NAME";
String sourceDatasetName = "MY_SOURCE_DATASET_NAME";
String sourceTableId = "MY_SOURCE_TABLE_NAME";

copyTable(sourceDatasetName, sourceTableId, destinationDatasetName, destinationTableId);
}

public static void copyTable(String sourceDatasetName, String sourceTableId,
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 sourceTable = TableId.of(sourceDatasetName, sourceTableId);
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,
sourceTable
).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 table 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]
@@ -0,0 +1,87 @@
/*
* 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.Schema;
import com.google.cloud.bigquery.StandardSQLTypeName;
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 CopyTableIT {
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() throws Exception {
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}

@After
public void tearDown() {
System.setOut(null);
}

@Test
public void testCopyTable() {
// Create a new destination and source table for each test since existing table cannot be overwritten
String generatedDestTableName = "gcloud_test_table_temp_" +
UUID.randomUUID().toString().replace('-', '_');
String generatedSourceTableName = "gcloud_test_table_temp_" +
UUID.randomUUID().toString().replace('-', '_');

//Adding an arbitrary table schema so we aren't copying nothing.
Schema schema =
Schema.of(
Field.of("stringField", StandardSQLTypeName.STRING),
Field.of("booleanField", StandardSQLTypeName.BOOL));

CreateTable.createTable(BIGQUERY_DATASET_NAME, generatedDestTableName, schema);
CreateTable.createTable(BIGQUERY_DATASET_NAME, generatedSourceTableName, schema);

CopyTable.copyTable(BIGQUERY_DATASET_NAME, generatedSourceTableName,
BIGQUERY_DATASET_NAME, generatedDestTableName);
assertThat(bout.toString()).contains("Table copied successfully.");

// Clean up
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, generatedDestTableName);
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, generatedSourceTableName);
}
}

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