/
RelaxTableQuery.java
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/
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.
*/
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]