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feat: new sample - Tables: Add empty column (#85)
* feat: new sample - Tables: Add empty column * format code * update base on comments * update base on comments
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samples/src/main/java/com/example/bigquery/AddEmptyColumn.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_add_empty_column] | ||
import com.google.cloud.bigquery.BigQuery; | ||
import com.google.cloud.bigquery.BigQueryException; | ||
import com.google.cloud.bigquery.BigQueryOptions; | ||
import com.google.cloud.bigquery.Field; | ||
import com.google.cloud.bigquery.FieldList; | ||
import com.google.cloud.bigquery.LegacySQLTypeName; | ||
import com.google.cloud.bigquery.Schema; | ||
import com.google.cloud.bigquery.StandardTableDefinition; | ||
import com.google.cloud.bigquery.Table; | ||
import java.util.ArrayList; | ||
import java.util.List; | ||
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public class AddEmptyColumn { | ||
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public static void runAddEmptyColumn() { | ||
// TODO(developer): Replace these variables before running the sample. | ||
String datasetName = "MY_DATASET_NAME"; | ||
String tableId = "MY_TABLE_NAME"; | ||
String newColumnName = "NEW_COLUMN_NAME"; | ||
addEmptyColumn(newColumnName, datasetName, tableId); | ||
} | ||
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public static void addEmptyColumn(String newColumnName, String datasetName, String tableId) { | ||
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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Table table = bigquery.getTable(datasetName, tableId); | ||
Schema schema = table.getDefinition().getSchema(); | ||
FieldList fields = schema.getFields(); | ||
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// Create the new field/column | ||
Field newField = Field.of(newColumnName, LegacySQLTypeName.STRING); | ||
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// Create a new schema adding the current fields, plus the new one | ||
List<Field> fieldList = new ArrayList<Field>(); | ||
fields.forEach(fieldList::add); | ||
fieldList.add(newField); | ||
Schema newSchema = Schema.of(fieldList); | ||
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// Update the table with the new schema | ||
Table updatedTable = | ||
table.toBuilder().setDefinition(StandardTableDefinition.of(newSchema)).build(); | ||
updatedTable.update(); | ||
System.out.println("Empty column successfully added to table"); | ||
} catch (BigQueryException e) { | ||
System.out.println("Empty column was not added. \n" + e.toString()); | ||
} | ||
} | ||
} | ||
// [END bigquery_add_empty_column] |
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samples/src/test/java/com/example/bigquery/AddEmptyColumnIT.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 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; | ||
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public class AddEmptyColumnIT { | ||
private ByteArrayOutputStream bout; | ||
private PrintStream out; | ||
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private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME"); | ||
private static final String BIGQUERY_TEST_TABLE = System.getenv("BIGQUERY_TEST_TABLE"); | ||
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private static void requireEnvVar(String varName) { | ||
assertNotNull( | ||
"Environment variable " + varName + " is required to perform these tests.", | ||
System.getenv(varName)); | ||
} | ||
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@BeforeClass | ||
public static void checkRequirements() { | ||
requireEnvVar("BIGQUERY_DATASET_NAME"); | ||
requireEnvVar("BIGQUERY_TEST_TABLE"); | ||
} | ||
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@Before | ||
public void setUp() throws Exception { | ||
bout = new ByteArrayOutputStream(); | ||
out = new PrintStream(bout); | ||
System.setOut(out); | ||
} | ||
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@After | ||
public void tearDown() { | ||
System.setOut(null); | ||
} | ||
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@Test | ||
public void addEmptyColumn() { | ||
String randomColumnName = "new_" + UUID.randomUUID().toString().replace('-', '_'); | ||
AddEmptyColumn.addEmptyColumn(randomColumnName, BIGQUERY_DATASET_NAME, BIGQUERY_TEST_TABLE); | ||
assertThat(bout.toString()).contains("Empty column successfully added to table"); | ||
} | ||
} |