diff --git a/samples/src/main/java/com/example/bigquery/AddEmptyColumn.java b/samples/src/main/java/com/example/bigquery/AddEmptyColumn.java new file mode 100644 index 000000000..6e0372ec6 --- /dev/null +++ b/samples/src/main/java/com/example/bigquery/AddEmptyColumn.java @@ -0,0 +1,71 @@ +/* + * 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_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; + +public class AddEmptyColumn { + + 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); + } + + 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(); + + Table table = bigquery.getTable(datasetName, tableId); + Schema schema = table.getDefinition().getSchema(); + FieldList fields = schema.getFields(); + + // Create the new field/column + Field newField = Field.of(newColumnName, LegacySQLTypeName.STRING); + + // Create a new schema adding the current fields, plus the new one + List fieldList = new ArrayList(); + fields.forEach(fieldList::add); + fieldList.add(newField); + Schema newSchema = Schema.of(fieldList); + + // 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] diff --git a/samples/src/test/java/com/example/bigquery/AddEmptyColumnIT.java b/samples/src/test/java/com/example/bigquery/AddEmptyColumnIT.java new file mode 100644 index 000000000..da60b6581 --- /dev/null +++ b/samples/src/test/java/com/example/bigquery/AddEmptyColumnIT.java @@ -0,0 +1,67 @@ +/* + * 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 AddEmptyColumnIT { + private ByteArrayOutputStream bout; + private PrintStream out; + + private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME"); + private static final String BIGQUERY_TEST_TABLE = System.getenv("BIGQUERY_TEST_TABLE"); + + private static void requireEnvVar(String varName) { + assertNotNull( + "Environment variable " + varName + " is required to perform these tests.", + System.getenv(varName)); + } + + @BeforeClass + public static void checkRequirements() { + requireEnvVar("BIGQUERY_DATASET_NAME"); + requireEnvVar("BIGQUERY_TEST_TABLE"); + } + + @Before + public void setUp() throws Exception { + bout = new ByteArrayOutputStream(); + out = new PrintStream(bout); + System.setOut(out); + } + + @After + public void tearDown() { + System.setOut(null); + } + + @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"); + } +}