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feat: add new sample - Tables: Relax column query append (#115)
* feat: add new sample - Tables: Relax column query append * nit * update based on comments * update exception handling * refactor * update base on comments * code refactoring * fix build errors * add debugging statements * remove unused exception * debug * debug * debug * debug * debug * debug * revert back to cleaning up in method due to unkown nullpointer exception if using setup() or teardown() * update base on comments
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samples/src/main/java/com/example/bigquery/RelaxTableQuery.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_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; | ||
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public class RelaxTableQuery { | ||
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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); | ||
} | ||
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// 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(); | ||
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TableId tableId = TableId.of(datasetName, tableName); | ||
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String sourceTable = "`" + projectId + "." + datasetName + "." + tableName + "`"; | ||
String query = "SELECT word FROM " + sourceTable + " WHERE word like '%is%'"; | ||
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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(); | ||
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Job queryJob = bigquery.create(JobInfo.newBuilder(queryConfig).build()); | ||
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queryJob = queryJob.waitFor(); | ||
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// 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()); | ||
} | ||
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// Get the results. | ||
TableResult results = queryJob.getQueryResults(); | ||
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// Print all pages of the results. | ||
results | ||
.iterateAll() | ||
.forEach( | ||
rows -> { | ||
rows.forEach(row -> System.out.println("row: " + row.toString())); | ||
}); | ||
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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] |
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samples/src/test/java/com/example/bigquery/RelaxTableQueryIT.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 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; | ||
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public class RelaxTableQueryIT { | ||
private ByteArrayOutputStream bout; | ||
private PrintStream out; | ||
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private static final String BIGQUERY_PROJECT_ID = System.getenv("BIGQUERY_PROJECT_ID"); | ||
private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME"); | ||
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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_PROJECT_ID"); | ||
requireEnvVar("BIGQUERY_DATASET_NAME"); | ||
} | ||
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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 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()); | ||
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CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, originalSchema); | ||
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RelaxTableQuery.relaxTableQuery(BIGQUERY_PROJECT_ID, BIGQUERY_DATASET_NAME, tableName); | ||
assertThat(bout.toString()) | ||
.contains("Successfully relaxed all columns in destination table during query job"); | ||
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// Clean up | ||
DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName); | ||
} | ||
} |