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QueryPagination.java
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QueryPagination.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_pagination]
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 pagination.
public class QueryPagination {
public static void main(String[] args) {
String datasetName = "MY_DATASET_NAME";
String tableName = "MY_TABLE_NAME";
String query =
"SELECT name, SUM(number) as total_people"
+ " FROM `bigquery-public-data.usa_names.usa_1910_2013`"
+ " GROUP BY name"
+ " ORDER BY total_people DESC"
+ " LIMIT 100";
queryPagination(datasetName, tableName, query);
}
public static void queryPagination(String datasetName, String tableName, 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();
TableId tableId = TableId.of(datasetName, tableName);
QueryJobConfiguration queryConfig =
QueryJobConfiguration.newBuilder(query)
// save results into a table.
.setDestinationTable(tableId)
.build();
bigquery.query(queryConfig);
TableResult results =
bigquery.listTableData(tableId, BigQuery.TableDataListOption.pageSize(20));
// First Page
results
.getValues()
.forEach(row -> row.forEach(val -> System.out.printf("%s,\n", val.toString())));
while (results.hasNextPage()) {
// Remaining Pages
results = results.getNextPage();
results
.getValues()
.forEach(row -> row.forEach(val -> System.out.printf("%s,\n", val.toString())));
}
System.out.println("Query pagination performed successfully.");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Query not performed \n" + e.toString());
}
}
}
// [END bigquery_query_pagination]