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QueryLargeResults.java
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QueryLargeResults.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_query_legacy_large_results]
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.QueryJobConfiguration;
import com.google.cloud.bigquery.TableId;
import com.google.cloud.bigquery.TableResult;
// Sample to run query with large results and save the results to a table.
public class QueryLargeResults {
public static void runQueryLargeResults() {
// TODO(developer): Replace these variables before running the sample.
String destinationDataset = "MY_DESTINATION_DATASET_NAME";
String destinationTable = "MY_DESTINATION_TABLE_NAME";
String query = "SELECT corpus FROM [bigquery-public-data:samples.shakespeare] GROUP BY corpus;";
queryLargeResults(destinationDataset, destinationTable, query);
}
public static void queryLargeResults(
String destinationDataset, String destinationTable, String query) {
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();
QueryJobConfiguration queryConfig =
// To use legacy SQL syntax, set useLegacySql to true.
QueryJobConfiguration.newBuilder(query)
.setUseLegacySql(true)
// Save the results of the query to a permanent table.
.setDestinationTable(TableId.of(destinationDataset, destinationTable))
// Allow results larger than the maximum response size.
// If true, a destination table must be set.
.setAllowLargeResults(true)
.build();
TableResult results = bigquery.query(queryConfig);
results
.iterateAll()
.forEach(row -> row.forEach(val -> System.out.printf("%s,", val.toString())));
System.out.println("Query large results performed successfully.");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Query not performed \n" + e.toString());
}
}
}
// [END bigquery_query_legacy_large_results]