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docs(samples): add query (#463)
* docs(samples): add query

* docs(samples): add comment
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Praful Makani committed Jun 18, 2020
1 parent 68140d5 commit e5db01cac9309d0d2da819276d69af017c367929
Showing with 127 additions and 0 deletions.
  1. +70 −0 samples/snippets/src/main/java/com/example/bigquery/Query.java
  2. +57 −0 samples/snippets/src/test/java/com/example/bigquery/QueryIT.java
@@ -0,0 +1,70 @@
/*
* 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]
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.TableResult;

// Sample to query in a table
public class Query {

public static void runQuery() {
// TODO(developer): Replace these variables before running the sample.
String projectId = "MY_PROJECT_ID";
String datasetName = "MY_DATASET_NAME";
String tableName = "MY_TABLE_NAME";
String query =
"SELECT name, SUM(number) as total_people\n"
+ " FROM `"
+ projectId
+ "."
+ datasetName
+ "."
+ tableName
+ "`"
+ " WHERE state = 'TX'"
+ " GROUP BY name, state"
+ " ORDER BY total_people DESC"
+ " LIMIT 20";
query(query);
}

public static void query(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 = QueryJobConfiguration.newBuilder(query).build();

TableResult results = bigquery.query(queryConfig);

results
.iterateAll()
.forEach(row -> row.forEach(val -> System.out.printf("%s,", val.toString())));

System.out.println("Query performed successfully.");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Query not performed \n" + e.toString());
}
}
}
// [END bigquery_query]
@@ -0,0 +1,57 @@
/*
* 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 QueryIT {

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 testQuery() {
String query =
"SELECT name, SUM(number) as total_people"
+ " FROM `bigquery-public-data.usa_names.usa_1910_2013`"
+ " WHERE state = 'TX'"
+ " GROUP BY name, state"
+ " ORDER BY total_people DESC"
+ " LIMIT 20";

Query.query(query);
assertThat(bout.toString()).contains("Query performed successfully.");
}
}

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