Skip to content
Permalink
Browse files
feat: sample - query with named params (#116)
  • Loading branch information
stephaniewang526 committed Jan 18, 2020
1 parent 069240f commit ecec2f73fb43311538e92944341fed51c199cde0
@@ -43,7 +43,7 @@ public static void loadParquet(String datasetName) {

String sourceUri = "gs://cloud-samples-data/bigquery/us-states/us-states.parquet";
TableId tableId = TableId.of(datasetName, "us_states");

LoadJobConfiguration configuration =
LoadJobConfiguration.builder(tableId, sourceUri)
.setFormatOptions(FormatOptions.parquet())
@@ -0,0 +1,63 @@
/*
* 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_named]
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.TableResult;

public class QueryWithNamedParameters {

public static void queryWithNamedParameters() {
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();

String corpus = "romeoandjuliet";
long minWordCount = 250;
String query =
"SELECT word, word_count\n"
+ "FROM `bigquery-public-data.samples.shakespeare`\n"
+ "WHERE corpus = @corpus\n"
+ "AND word_count >= @min_word_count\n"
+ "ORDER BY word_count DESC";

// Note: Standard SQL is required to use query parameters.
QueryJobConfiguration queryConfig =
QueryJobConfiguration.newBuilder(query)
.addNamedParameter("corpus", QueryParameterValue.string(corpus))
.addNamedParameter("min_word_count", QueryParameterValue.int64(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 named parameters performed successfully.");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Query not performed \n" + e.toString());
}
}
}
// [END bigquery_query_params_named]
@@ -0,0 +1,48 @@
/*
* 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;

import static com.google.common.truth.Truth.assertThat;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class QueryWithNamedParametersIT {
private ByteArrayOutputStream bout;
private PrintStream out;

@Before
public void setUp() {
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}

@After
public void tearDown() {
System.setOut(null);
}

@Test
public void testQueryWithNamedParameters() {
QueryWithNamedParameters.queryWithNamedParameters();
assertThat(bout.toString()).contains("Query with named parameters performed successfully.");
}
}

0 comments on commit ecec2f7

Please sign in to comment.