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docs(samples): add create view ddl (#558)
* docs(samples): add create view ddl

* docs(samples): update ddl
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Praful Makani committed Jul 17, 2020
1 parent d51b539 commit 925321881cde3edd187a9a442a26eb508535744a
@@ -0,0 +1,78 @@
/*
* 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_ddl_create_view]
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Job;
import com.google.cloud.bigquery.JobInfo;
import com.google.cloud.bigquery.QueryJobConfiguration;

// Sample to create a view using DDL
public class DDLCreateView {

public static void runDDLCreateView() {
// TODO(developer): Replace these variables before running the sample.
String projectId = "MY_PROJECT_ID";
String datasetId = "MY_DATASET_ID";
String tableId = "MY_VIEW_ID";
String ddl =
"CREATE VIEW "
+ "`"
+ projectId
+ "."
+ datasetId
+ "."
+ tableId
+ "`"
+ " OPTIONS("
+ " expiration_timestamp=TIMESTAMP_ADD("
+ " CURRENT_TIMESTAMP(), INTERVAL 48 HOUR),"
+ " friendly_name=\"new_view\","
+ " description=\"a view that expires in 2 days\","
+ " labels=[(\"org_unit\", \"development\")]"
+ " )"
+ " AS SELECT name, state, year, number"
+ " FROM `bigquery-public-data.usa_names.usa_1910_current`"
+ " WHERE state LIKE 'W%'`";
ddlCreateView(ddl);
}

public static void ddlCreateView(String ddl) {
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 config = QueryJobConfiguration.newBuilder(ddl).build();

// create a view using query and it will wait to complete job.
Job job = bigquery.create(JobInfo.of(config));
job = job.waitFor();
if (job.isDone()) {
System.out.println("View created successfully");
} else {
System.out.println("View was not created");
}
} catch (BigQueryException | InterruptedException e) {
System.out.println("View was not created. \n" + e.toString());
}
}
}
// [END bigquery_ddl_create_view]
@@ -0,0 +1,92 @@
/*
* 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 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 DDLCreateViewIT {

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

private static final String PROJECT_ID = requireEnvVar("GOOGLE_CLOUD_PROJECT");
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("GOOGLE_CLOUD_PROJECT");
requireEnvVar("BIGQUERY_DATASET_NAME");
}

@Before
public void setUp() {
viewName = "MY_VIEW_NAME_TEST_" + UUID.randomUUID().toString().substring(0, 8);
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}

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

@Test
public void testDDLCreateView() {
String sql =
"CREATE VIEW "
+ "`"
+ PROJECT_ID
+ "."
+ BIGQUERY_DATASET_NAME
+ "."
+ viewName
+ "`"
+ " OPTIONS("
+ " expiration_timestamp=TIMESTAMP_ADD("
+ " CURRENT_TIMESTAMP(), INTERVAL 48 HOUR),"
+ " friendly_name=\"new_view\","
+ " description=\"a view that expires in 2 days\","
+ " labels=[(\"org_unit\", \"development\")]"
+ " )"
+ " AS SELECT name, state, year, number"
+ " FROM `bigquery-public-data.usa_names.usa_1910_current`"
+ " WHERE state LIKE 'W%'";
DDLCreateView.ddlCreateView(sql);
assertThat(bout.toString()).contains("View created successfully");
}
}

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