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docs(samples): update view query (#625)
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Praful Makani committed Jul 30, 2020
1 parent 29272bb commit 8d717202ed36f55dd141ba45243f2dc30b597d99
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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;

// [START bigquery_update_view_query]
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.TableId;
import com.google.cloud.bigquery.TableInfo;
import com.google.cloud.bigquery.ViewDefinition;

// Sample to update query on a view
public class UpdateViewQuery {

public static void runUpdateViewQuery() {
// TODO(developer): Replace these variables before running the sample.
String datasetName = "MY_DATASET_NAME";
String tableName = "MY_TABLE_NAME";
String viewName = "MY_VIEW_NAME";
String updateQuery =
String.format("SELECT TimestampField, StringField FROM %s.%s", datasetName, tableName);
updateViewQuery(datasetName, viewName, updateQuery);
}

public static void updateViewQuery(String datasetName, String viewName, 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();

// Retrieve existing view metadata
TableInfo viewMetadata = bigquery.getTable(TableId.of(datasetName, viewName));

// Update view query
ViewDefinition viewDefinition = viewMetadata.getDefinition();
viewDefinition.toBuilder().setQuery(query).build();

// Set metadata
bigquery.update(viewMetadata.toBuilder().setDefinition(viewDefinition).build());

System.out.println("View query updated successfully");
} catch (BigQueryException e) {
System.out.println("View query was not updated. \n" + e.toString());
}
}
}
// [END bigquery_update_view_query]
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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 org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

public class UpdateViewQueryIT {

private String tableName;
private String viewName;
private ByteArrayOutputStream bout;
private PrintStream out;

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);
System.setOut(out);

tableName = "MY_TABLE_NAME_TEST_" + UUID.randomUUID().toString().substring(0, 8);
viewName = "MY_VIEW_NAME_TEST_" + UUID.randomUUID().toString().substring(0, 8);

// create a test table.
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);

// create a test view
String query =
String.format(
"SELECT timestampField, stringField, booleanField FROM %s.%s",
BIGQUERY_DATASET_NAME, tableName);
CreateView.createView(BIGQUERY_DATASET_NAME, viewName, query);

bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}

@After
public void tearDown() {
// Clean up
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, viewName);
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
System.setOut(null);
}

@Test
public void testUpdateViewQuery() {
String updateQuery =
String.format(
"SELECT TimestampField, StringField FROM %s.%s", BIGQUERY_DATASET_NAME, tableName);
UpdateViewQuery.updateViewQuery(BIGQUERY_DATASET_NAME, viewName, updateQuery);
assertThat(bout.toString()).contains("View query updated successfully");
}
}

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