Skip to content
Permalink
Browse files
docs(samples): add create view (#497)
  • Loading branch information
Praful Makani committed Jul 1, 2020
1 parent 62e0020 commit 09cf7f1a937c6c66b65ddc92cff1c29df63e6162
Showing with 152 additions and 0 deletions.
  1. +59 −0 samples/snippets/src/main/java/com/example/bigquery/CreateView.java
  2. +93 −0 samples/snippets/src/test/java/com/example/bigquery/CreateViewIT.java
@@ -0,0 +1,59 @@
/*
* 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_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.TableId;
import com.google.cloud.bigquery.TableInfo;
import com.google.cloud.bigquery.ViewDefinition;

// Sample to create a view
public class CreateView {

public static void runCreateView() {
// 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 query =
String.format(
"SELECT TimestampField, StringField, BooleanField FROM %s.%s", datasetName, tableName);
createView(datasetName, viewName, query);
}

public static void createView(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();

TableId tableId = TableId.of(datasetName, viewName);

ViewDefinition viewDefinition =
ViewDefinition.newBuilder(query).setUseLegacySql(false).build();

bigquery.create(TableInfo.of(tableId, viewDefinition));
System.out.println("View created successfully");
} catch (BigQueryException e) {
System.out.println("View was not created. \n" + e.toString());
}
}
}
// [END bigquery_create_view]
@@ -0,0 +1,93 @@
/*
* 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 CreateViewIT {

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);

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);

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 testCreateView() {
String query =
String.format(
"SELECT timestampField, stringField, booleanField FROM %s.%s",
BIGQUERY_DATASET_NAME, tableName);
CreateView.createView(BIGQUERY_DATASET_NAME, viewName, query);
assertThat(bout.toString()).contains("View created successfully");
}
}

0 comments on commit 09cf7f1

Please sign in to comment.