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CopyMultipleTables.java
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CopyMultipleTables.java
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/*
* Copyright 2019 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_multiple_source]
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;
import java.util.Arrays;
public class CopyMultipleTables {
public static void main(String[] args) {
// TODO(developer): Replace these variables before running the sample.
String destinationDatasetName = "MY_DATASET_NAME";
String destinationTableId = "MY_TABLE_NAME";
String sourceTable1Id = "MY_SOURCE_TABLE_1";
String sourceTable2Id = "MY_SOURCE_TABLE_2";
copyMultipleTables(destinationDatasetName, destinationTableId, sourceTable1Id, sourceTable2Id);
}
public static void copyMultipleTables(
String destinationDatasetName,
String destinationTableId,
String sourceTable1Id,
String sourceTable2Id) {
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 destinationTable = TableId.of(destinationDatasetName, destinationTableId);
TableId sourceTable1 = TableId.of(destinationDatasetName, sourceTable1Id);
TableId sourceTable2 = TableId.of(destinationDatasetName, sourceTable2Id);
// 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, Arrays.asList(sourceTable1, sourceTable2))
.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 tables 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_multiple_source]