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docs(samples): add query batch (#469)
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Praful Makani
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samples/snippets/src/main/java/com/example/bigquery/QueryBatch.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_query_batch] | ||
import com.google.cloud.bigquery.BigQuery; | ||
import com.google.cloud.bigquery.BigQueryException; | ||
import com.google.cloud.bigquery.BigQueryOptions; | ||
import com.google.cloud.bigquery.QueryJobConfiguration; | ||
import com.google.cloud.bigquery.TableResult; | ||
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// Sample to query batch in a table | ||
public class QueryBatch { | ||
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public static void runQueryBatch() { | ||
// TODO(developer): Replace these variables before running the sample. | ||
String projectId = "MY_PROJECT_ID"; | ||
String datasetName = "MY_DATASET_NAME"; | ||
String tableName = "MY_TABLE_NAME"; | ||
String query = | ||
"SELECT corpus" | ||
+ " FROM `" | ||
+ projectId | ||
+ "." | ||
+ datasetName | ||
+ "." | ||
+ tableName | ||
+ " GROUP BY corpus;"; | ||
queryBatch(query); | ||
} | ||
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public static void queryBatch(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(); | ||
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QueryJobConfiguration queryConfig = | ||
QueryJobConfiguration.newBuilder(query) | ||
// Run at batch priority, which won't count toward concurrent rate limit. | ||
.setPriority(QueryJobConfiguration.Priority.BATCH) | ||
.build(); | ||
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TableResult results = bigquery.query(queryConfig); | ||
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results | ||
.iterateAll() | ||
.forEach(row -> row.forEach(val -> System.out.printf("%s,", val.toString()))); | ||
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System.out.println("Query batch performed successfully."); | ||
} catch (BigQueryException | InterruptedException e) { | ||
System.out.println("Query batch not performed \n" + e.toString()); | ||
} | ||
} | ||
} | ||
// [END bigquery_query_batch] |
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samples/snippets/src/test/java/com/example/bigquery/QueryBatchIT.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; | ||
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import java.io.ByteArrayOutputStream; | ||
import java.io.PrintStream; | ||
import org.junit.After; | ||
import org.junit.Before; | ||
import org.junit.Test; | ||
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public class QueryBatchIT { | ||
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private ByteArrayOutputStream bout; | ||
private PrintStream out; | ||
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@Before | ||
public void setUp() { | ||
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 testQueryBatch() { | ||
String query = "SELECT corpus FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus"; | ||
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QueryBatch.queryBatch(query); | ||
assertThat(bout.toString()).contains("Query batch performed successfully."); | ||
} | ||
} |