Skip to content
Merged
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
95 changes: 95 additions & 0 deletions samples/src/main/java/com/example/bigquery/RelaxTableQuery.java
Original file line number Diff line number Diff line change
@@ -0,0 +1,95 @@
/*
* 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_relax_column_query_append]
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.JobInfo.SchemaUpdateOption;
import com.google.cloud.bigquery.JobInfo.WriteDisposition;
import com.google.cloud.bigquery.QueryJobConfiguration;
import com.google.cloud.bigquery.TableId;
import com.google.cloud.bigquery.TableResult;
import com.google.common.collect.ImmutableList;

public class RelaxTableQuery {

public static void runRelaxTableQuery() throws Exception {
// TODO(developer): Replace these variables before running the sample.
String projectId = "MY_PROJECT_ID";
String datasetName = "MY_DATASET_NAME";
String tableName = "MY_TABLE_NAME";
relaxTableQuery(projectId, datasetName, tableName);
}

// To relax all columns in a destination table when you append data to it during a query job
public static void relaxTableQuery(String projectId, String datasetName, String tableName)
throws Exception {
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, tableName);

String sourceTable = "`" + projectId + "." + datasetName + "." + tableName + "`";
String query = "SELECT word FROM " + sourceTable + " WHERE word like '%is%'";

QueryJobConfiguration queryConfig =
QueryJobConfiguration.newBuilder(query)
// Use standard SQL syntax for queries.
// See: https://cloud.google.com/bigquery/sql-reference/
.setUseLegacySql(false)
.setSchemaUpdateOptions(ImmutableList.of(SchemaUpdateOption.ALLOW_FIELD_RELAXATION))
.setWriteDisposition(WriteDisposition.WRITE_APPEND)
.setDestinationTable(tableId)
.build();

Job queryJob = bigquery.create(JobInfo.newBuilder(queryConfig).build());

queryJob = queryJob.waitFor();

// Check for errors
if (queryJob == null) {
throw new Exception("Job no longer exists");
} else if (queryJob.getStatus().getError() != null) {
// You can also look at queryJob.getStatus().getExecutionErrors() for all
// errors, not just the latest one.
throw new Exception(queryJob.getStatus().getError().toString());
}

// Get the results.
TableResult results = queryJob.getQueryResults();

// Print all pages of the results.
results
.iterateAll()
.forEach(
rows -> {
rows.forEach(row -> System.out.println("row: " + row.toString()));
});

System.out.println("Successfully relaxed all columns in destination table during query job");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Columns not relaxed during query job \n" + e.toString());
}
}
}
// [END bigquery_relax_column_query_append]
89 changes: 89 additions & 0 deletions samples/src/test/java/com/example/bigquery/RelaxTableQueryIT.java
Original file line number Diff line number Diff line change
@@ -0,0 +1,89 @@
/*
* 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.LegacySQLTypeName;
import com.google.cloud.bigquery.Schema;
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 RelaxTableQueryIT {
private ByteArrayOutputStream bout;
private PrintStream out;

private static final String BIGQUERY_PROJECT_ID = System.getenv("BIGQUERY_PROJECT_ID");
private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");

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_PROJECT_ID");
requireEnvVar("BIGQUERY_DATASET_NAME");
}

@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 testRelaxTableQuery() throws Exception {
String tableName = "RELAX_TABLE_QUERY_TEST" + UUID.randomUUID().toString().replace('-', '_');
Schema originalSchema =
Schema.of(
Field.newBuilder("word", LegacySQLTypeName.STRING).setMode(Field.Mode.REQUIRED).build(),
Field.newBuilder("word_count", LegacySQLTypeName.STRING)
.setMode(Field.Mode.REQUIRED)
.build(),
Field.newBuilder("corpus", LegacySQLTypeName.STRING)
.setMode(Field.Mode.REQUIRED)
.build(),
Field.newBuilder("corpus_date", LegacySQLTypeName.STRING)
.setMode(Field.Mode.REQUIRED)
.build());

CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, originalSchema);

RelaxTableQuery.relaxTableQuery(BIGQUERY_PROJECT_ID, BIGQUERY_DATASET_NAME, tableName);
assertThat(bout.toString())
.contains("Successfully relaxed all columns in destination table during query job");

// Clean up
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
}
}