forked from googleapis/java-bigquery
/
ExtractTableToJSON.java
84 lines (75 loc) · 3.25 KB
/
ExtractTableToJSON.java
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/*
* Copyright 2019 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_extract_table]
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.Job;
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 com.google.cloud.bigquery.TableDefinition;
import com.google.cloud.bigquery.TableId;
import com.google.cloud.bigquery.TableInfo;
public class ExtractTableToJSON {
public static void runExtractTableToJSON() {
// TODO(developer): Replace these variables before running the sample.
String datasetName = "MY_DATASET_NAME";
String format = "CSV";
String bucketName = "my-bucket";
String gcsFileName = "gs://" + bucketName + "/path/to/file";
// Create a new table to extract to GCS as CSV
String tableName = "MY_TABLE_NAME";
Schema schema =
Schema.of(
Field.of("stringField", LegacySQLTypeName.STRING),
Field.of("booleanField", LegacySQLTypeName.BOOLEAN));
Table table = createTableHelper(datasetName, tableName, schema);
//Extract table
extractTableToJSON(table, format, gcsFileName);
}
// Exports my-dataset-name:my_table to gcs://my-bucket/my-file as raw CSV
public static void extractTableToJSON(Table table, String format, String gcsFileName) {
try {
Job job = table.extract(format, gcsFileName);
if(job != null && job.getStatus().getError() == null)
System.out.println("Table extraction job completed successfully. Check in GCS bucket for the CSV file.");
else
System.out.println("Table extraction job failed");
} catch (BigQueryException e) {
System.out.println("Table extraction job was interrupted. \n" + e.toString());
}
}
private static Table createTableHelper(String datasetName, String tableName, Schema schema) {
// 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);
TableDefinition tableDefinition = StandardTableDefinition.of(schema);
TableInfo tableInfo = TableInfo.newBuilder(tableId, tableDefinition).build();
try {
Table table = bigquery.create(tableInfo);
return table;
} catch (BigQueryException e) {
System.out.println("Table was not created. \n" + e.toString());
return null;
}
}
}
// [END bigquery_extract_table]