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docs(samples): add alter materialized view (#979)
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Praful Makani
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samples/snippets/src/main/java/com/example/bigquery/AlterMaterializedView.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. | ||
*/ | ||
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package com.example.bigquery; | ||
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// [START bigquery_alter_materialized_view] | ||
import com.google.cloud.bigquery.BigQuery; | ||
import com.google.cloud.bigquery.BigQueryException; | ||
import com.google.cloud.bigquery.BigQueryOptions; | ||
import com.google.cloud.bigquery.MaterializedViewDefinition; | ||
import com.google.cloud.bigquery.Table; | ||
import com.google.cloud.bigquery.TableId; | ||
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// Sample to alter materialized view | ||
public class AlterMaterializedView { | ||
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public static void main(String[] args) { | ||
// TODO(developer): Replace these variables before running the sample. | ||
String datasetName = "MY_DATASET_NAME"; | ||
String materializedViewName = "MY_MATERIALIZED_VIEW_NAME"; | ||
alterMaterializedView(datasetName, materializedViewName); | ||
} | ||
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public static void alterMaterializedView(String datasetName, String materializedViewName) { | ||
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(); | ||
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TableId tableId = TableId.of(datasetName, materializedViewName); | ||
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// Get existing materialized view | ||
Table table = bigquery.getTable(tableId); | ||
MaterializedViewDefinition materializedViewDefinition = table.getDefinition(); | ||
// Alter materialized view | ||
materializedViewDefinition | ||
.toBuilder() | ||
.setEnableRefresh(true) | ||
.setRefreshIntervalMs(1000L) | ||
.build(); | ||
table.toBuilder().setDefinition(materializedViewDefinition).build().update(); | ||
System.out.println("Materialized view altered successfully"); | ||
} catch (BigQueryException e) { | ||
System.out.println("Materialized view was not altered. \n" + e.toString()); | ||
} | ||
} | ||
} | ||
// [END bigquery_alter_materialized_view] |
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samples/snippets/src/test/java/com/example/bigquery/AlterMaterializedViewIT.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. | ||
*/ | ||
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package com.example.bigquery; | ||
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import static com.google.common.truth.Truth.assertThat; | ||
import static junit.framework.TestCase.assertNotNull; | ||
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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; | ||
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public class AlterMaterializedViewIT { | ||
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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; | ||
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private static final String BIGQUERY_DATASET_NAME = requireEnvVar("BIGQUERY_DATASET_NAME"); | ||
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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; | ||
} | ||
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@BeforeClass | ||
public static void checkRequirements() { | ||
requireEnvVar("BIGQUERY_DATASET_NAME"); | ||
} | ||
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@Before | ||
public void setUp() { | ||
bout = new ByteArrayOutputStream(); | ||
out = new PrintStream(bout); | ||
originalPrintStream = System.out; | ||
System.setOut(out); | ||
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tableName = "MY_TABLE_NAME_TEST_" + ID; | ||
materializedViewName = "MY_ALTER_MATERIALIZED_VIEW_NAME_TEST_" + ID; | ||
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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); | ||
} | ||
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@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()); | ||
} | ||
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@Test | ||
public void testAlterMaterializedView() { | ||
AlterMaterializedView.alterMaterializedView(BIGQUERY_DATASET_NAME, materializedViewName); | ||
assertThat(bout.toString()).contains("Materialized view altered successfully"); | ||
} | ||
} |