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QueryWithPositionalTypesParameters.java
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QueryWithPositionalTypesParameters.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_params_positional_types]
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.QueryParameterValue;
import com.google.cloud.bigquery.StandardSQLTypeName;
import com.google.cloud.bigquery.TableResult;
// Sample to run query with positional types parameters.
public class QueryWithPositionalTypesParameters {
public static void main(String[] args) {
String[] words = {"and", "is", "the", "moon"};
String corpus = "romeoandjuliet";
Integer wordsCount = 250;
String query =
"SELECT word, word_count"
+ " FROM `bigquery-public-data.samples.shakespeare`"
+ " WHERE word IN UNNEST(?)"
+ " AND corpus = ?"
+ " AND word_count >= ?"
+ " ORDER BY word_count DESC";
queryWithPositionalTypesParameters(query, words, corpus, wordsCount);
}
public static void queryWithPositionalTypesParameters(
String query, String[] words, String corpus, Integer wordsCount) {
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();
QueryParameterValue wordList = QueryParameterValue.array(words, StandardSQLTypeName.STRING);
QueryParameterValue corpusParam = QueryParameterValue.of(corpus, StandardSQLTypeName.STRING);
QueryParameterValue minWordCount =
QueryParameterValue.of(wordsCount, StandardSQLTypeName.INT64);
// Note: Standard SQL is required to use query parameters.
QueryJobConfiguration queryConfig =
QueryJobConfiguration.newBuilder(query)
.addPositionalParameter(wordList)
.addPositionalParameter(corpusParam)
.addPositionalParameter(minWordCount)
.build();
TableResult results = bigquery.query(queryConfig);
results
.iterateAll()
.forEach(row -> row.forEach(val -> System.out.printf("%s,", val.toString())));
System.out.println("Query with positional types parameters performed successfully.");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Query not performed \n" + e.toString());
}
}
}
// [END bigquery_query_params_positional_types]