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docs(samples): add query materialized view (#978)
* docs(samples): add query materialized view

* docs(samples): address feedback
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Praful Makani committed Dec 1, 2020
1 parent aeecac9 commit cf36b82ef9bc0849a87b717c099321915a76b967
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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;

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;

public class QueryMaterializedView {

public static void main(String[] args) throws InterruptedException {
// TODO(developer): Replace these variables before running the sample.
String datasetName = "MY_DATASET_NAME";
String materializedViewName = "MY_MATERIALIZED_VIEW_NAME";
String query = String.format("SELECT * FROM %s.%s", datasetName, materializedViewName);
queryMaterializedView(query);
}

public static void queryMaterializedView(String query) throws InterruptedException {
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();

TableResult results = bigquery.query(QueryJobConfiguration.of(query));
results
.iterateAll()
.forEach(row -> row.forEach(val -> System.out.printf("%s\n", val.toString())));

System.out.println("Query performed successfully.");
} catch (BigQueryException e) {
System.out.println("Query was not performed. \n" + e.toString());
}
}
}
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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;

import static com.google.common.truth.Truth.assertThat;
import static junit.framework.TestCase.assertNotNull;

import com.google.cloud.bigquery.Field;
import com.google.cloud.bigquery.Schema;
import com.google.cloud.bigquery.StandardSQLTypeName;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.UUID;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

public class QueryMaterializedViewIT {

private static final String ID = UUID.randomUUID().toString().substring(0, 8);
private final Logger log = Logger.getLogger(this.getClass().getName());
private String tableName;
private String materializedViewName;
private ByteArrayOutputStream bout;
private PrintStream out;
private PrintStream originalPrintStream;

private static final String BIGQUERY_DATASET_NAME = requireEnvVar("BIGQUERY_DATASET_NAME");

private static String requireEnvVar(String varName) {
String value = System.getenv(varName);
assertNotNull(
"Environment variable " + varName + " is required to perform these tests.",
System.getenv(varName));
return value;
}

@BeforeClass
public static void checkRequirements() {
requireEnvVar("BIGQUERY_DATASET_NAME");
}

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

tableName = "MY_TABLE_NAME_TEST_" + ID;
materializedViewName = "MY_QUERY_MATERIALIZED_VIEW_NAME_TEST_" + ID;

Schema schema =
Schema.of(
Field.of("timestampField", StandardSQLTypeName.TIMESTAMP),
Field.of("stringField", StandardSQLTypeName.STRING),
Field.of("booleanField", StandardSQLTypeName.BOOL));
CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, schema);
String query =
String.format(
"SELECT MAX(TimestampField) AS TimestampField, StringField, "
+ "MAX(BooleanField) AS BooleanField "
+ "FROM %s.%s GROUP BY StringField",
BIGQUERY_DATASET_NAME, tableName);
CreateMaterializedView.createMaterializedView(
BIGQUERY_DATASET_NAME, materializedViewName, query);
}

@After
public void tearDown() {
// Clean up
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, materializedViewName);
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
// restores print statements in the original method
System.out.flush();
System.setOut(originalPrintStream);
log.log(Level.INFO, bout.toString());
}

@Test
public void testQueryMaterializedView() throws InterruptedException {
String query =
String.format("SELECT * FROM %s.%s", BIGQUERY_DATASET_NAME, materializedViewName);
QueryMaterializedView.queryMaterializedView(query);
assertThat(bout.toString()).contains("Query performed successfully.");
}
}

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