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docs(samples): added copy table and accompanying test (#414)
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samples/snippets/src/main/java/com/example/bigquery/CopyTable.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. | ||
*/ | ||
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package com.example.bigquery; | ||
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// [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; | ||
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public class CopyTable { | ||
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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"; | ||
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copyTable(sourceDatasetName, sourceTableId, destinationDatasetName, destinationTableId); | ||
} | ||
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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(); | ||
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TableId sourceTable = TableId.of(sourceDatasetName, sourceTableId); | ||
TableId destinationTable = TableId.of(destinationDatasetName, destinationTableId); | ||
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// 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(); | ||
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// 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)); | ||
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// 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] |
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samples/snippets/src/test/java/com/example/bigquery/CopyTableIT.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. | ||
*/ | ||
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package com.example.bigquery; | ||
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import static com.google.common.truth.Truth.assertThat; | ||
import static junit.framework.TestCase.assertNotNull; | ||
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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; | ||
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public class CopyTableIT { | ||
private ByteArrayOutputStream bout; | ||
private PrintStream out; | ||
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private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME"); | ||
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private static void requireEnvVar(String varName) { | ||
assertNotNull( | ||
"Environment variable " + varName + " is required to perform these tests.", | ||
System.getenv(varName)); | ||
} | ||
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@BeforeClass | ||
public static void checkRequirements() { | ||
requireEnvVar("BIGQUERY_DATASET_NAME"); | ||
} | ||
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@Before | ||
public void setUp() throws Exception { | ||
bout = new ByteArrayOutputStream(); | ||
out = new PrintStream(bout); | ||
System.setOut(out); | ||
} | ||
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@After | ||
public void tearDown() { | ||
System.setOut(null); | ||
} | ||
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@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('-', '_'); | ||
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//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)); | ||
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CreateTable.createTable(BIGQUERY_DATASET_NAME, generatedDestTableName, schema); | ||
CreateTable.createTable(BIGQUERY_DATASET_NAME, generatedSourceTableName, schema); | ||
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CopyTable.copyTable(BIGQUERY_DATASET_NAME, generatedSourceTableName, | ||
BIGQUERY_DATASET_NAME, generatedDestTableName); | ||
assertThat(bout.toString()).contains("Table copied successfully."); | ||
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// Clean up | ||
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, generatedDestTableName); | ||
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, generatedSourceTableName); | ||
} | ||
} |