Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
docs(samples): add query materialized view (#978)
* docs(samples): add query materialized view * docs(samples): address feedback
- Loading branch information
Praful Makani
committed
Dec 1, 2020
1 parent
aeecac9
commit cf36b82
Showing
2 changed files
with
155 additions
and
0 deletions.
There are no files selected for viewing
51 changes: 51 additions & 0 deletions
51
samples/snippets/src/main/java/com/example/bigquery/QueryMaterializedView.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,51 @@ | ||
/* | ||
* 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()); | ||
} | ||
} | ||
} |
104 changes: 104 additions & 0 deletions
104
samples/snippets/src/test/java/com/example/bigquery/QueryMaterializedViewIT.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,104 @@ | ||
/* | ||
* 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."); | ||
} | ||
} |