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LoadCsvFromGcsTruncate.java
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LoadCsvFromGcsTruncate.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.
*/
package com.example.bigquery;
// [START bigquery_load_table_gcs_csv_truncate]
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.JobInfo;
import com.google.cloud.bigquery.JobInfo.WriteDisposition;
import com.google.cloud.bigquery.LoadJobConfiguration;
import com.google.cloud.bigquery.TableId;
// Sample to overwrite the BigQuery table data by loading a CSV file from GCS
public class LoadCsvFromGcsTruncate {
public static void main(String[] args) 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";
loadCsvFromGcsTruncate(datasetName, tableName, sourceUri);
}
public static void loadCsvFromGcsTruncate(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();
TableId tableId = TableId.of(datasetName, tableName);
LoadJobConfiguration configuration =
LoadJobConfiguration.builder(tableId, sourceUri)
.setFormatOptions(FormatOptions.csv())
// Set the write disposition to overwrite existing table data
.setWriteDisposition(WriteDisposition.WRITE_TRUNCATE)
.build();
// For more information on Job see:
// https://googleapis.dev/java/google-cloud-clients/latest/index.html?com/google/cloud/bigquery/package-summary.html
// Load the table
Job loadJob = bigquery.create(JobInfo.of(configuration));
// 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("Table is successfully overwritten by CSV file loaded from GCS");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Column not added during load append \n" + e.toString());
}
}
}
// [END bigquery_load_table_gcs_csv_truncate]