forked from googleapis/java-bigquery
/
ExtractTableToJson.java
74 lines (67 loc) · 2.95 KB
/
ExtractTableToJson.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_extract_table]
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Job;
import com.google.cloud.bigquery.Table;
import com.google.cloud.bigquery.TableId;
public class ExtractTableToJson {
public static void runextracttabletojson() {
// TODO(developer): Replace these variables before running the sample.
String projectId = "bigquery-public-data";
String datasetName = "samples";
String tableName = "shakespeare";
String bucketName = "my-bucket";
String destinationUri = "gs://" + bucketName + "/path/to/file";
extractTableToJson(projectId, datasetName, tableName, destinationUri);
}
// Exports datasetName:tableName to destinationUri as raw CSV
public static void extractTableToJson(
String projectId, String datasetName, String tableName, String destinationUri) {
// 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(projectId, datasetName, tableName);
Table table = bigquery.getTable(tableId);
// For more information on export format available see:
// https://cloud.google.com/bigquery/docs/exporting-data#export_formats_and_compression_types
// 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 = table.extract("CSV", destinationUri);
try {
Job completedJob = job.waitFor();
if (completedJob == null) {
// Job no longer exists
System.out.println("Job no longer exists");
return;
} else if (completedJob.getStatus().getError() != null) {
// Job failed, handle error
System.out.println(
"BigQuery was unable to extract due to an error: \n" + job.getStatus().getError());
return;
} else {
// Job completed successfully
System.out.println("Table export successful. Check in GCS bucket for the CSV file.");
}
} catch (InterruptedException e) {
// Handle interrupted wait
System.out.println("Table extraction job was interrupted. \n" + e.toString());
}
}
}
// [END bigquery_extract_table]