Scrivi in BigQuery
Mantieni tutto organizzato con le raccolte
Salva e classifica i contenuti in base alle tue preferenze.
Scrivere da Dataflow in una tabella BigQuery esistente
Per saperne di più
Per la documentazione dettagliata che include questo esempio di codice, vedi quanto segue:
Esempio di codice
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
[[["Facile da capire","easyToUnderstand","thumb-up"],["Il problema è stato risolto","solvedMyProblem","thumb-up"],["Altra","otherUp","thumb-up"]],[["Difficile da capire","hardToUnderstand","thumb-down"],["Informazioni o codice di esempio errati","incorrectInformationOrSampleCode","thumb-down"],["Mancano le informazioni o gli esempi di cui ho bisogno","missingTheInformationSamplesINeed","thumb-down"],["Problema di traduzione","translationIssue","thumb-down"],["Altra","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis content demonstrates how to write data from Dataflow to an existing BigQuery table using Java.\u003c/p\u003e\n"],["\u003cp\u003eThe code sample utilizes the \u003ccode\u003eBigQueryIO.write()\u003c/code\u003e transform to send data to BigQuery, including specifying the table destination, data format, and write dispositions.\u003c/p\u003e\n"],["\u003cp\u003eThe process involves creating a Dataflow pipeline, generating an in-memory collection of custom data objects, and applying a transformation to convert it into the needed format.\u003c/p\u003e\n"],["\u003cp\u003eAuthentication with Dataflow is achieved through the setup of Application Default Credentials (ADC).\u003c/p\u003e\n"],["\u003cp\u003ePipeline options such as project ID, dataset name, and table name are configured for dynamic table targeting.\u003c/p\u003e\n"]]],[],null,["# Write to BigQuery\n\nWrite from Dataflow to an existing BigQuery table\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Write from Dataflow to BigQuery](/dataflow/docs/guides/write-to-bigquery)\n\nCode sample\n-----------\n\n### Java\n\n\nTo authenticate to Dataflow, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n import com.google.api.services.bigquery.model.TableRow;\n import java.util.Arrays;\n import java.util.List;\n import org.apache.beam.sdk.Pipeline;\n import org.apache.beam.sdk.coders.DefaultCoder;\n import org.apache.beam.sdk.extensions.avro.coders.AvroCoder;\n import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO;\n import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write;\n import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write.CreateDisposition;\n import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write.WriteDisposition;\n import org.apache.beam.sdk.options.PipelineOptionsFactory;\n import org.apache.beam.sdk.transforms.Create;\n\n public class BigQueryWrite {\n // A custom datatype for the source data.\n @DefaultCoder(AvroCoder.class)\n public static class MyData {\n public String name;\n public Long age;\n\n public MyData() {}\n\n public MyData(String name, Long age) {\n this.name = name;\n this.age = age;\n }\n }\n\n public static void main(String[] args) {\n // Example source data.\n final List\u003cMyData\u003e data = Arrays.asList(\n new MyData(\"Alice\", 40L),\n new MyData(\"Bob\", 30L),\n new MyData(\"Charlie\", 20L)\n );\n\n // Parse the pipeline options passed into the application. Example:\n // --projectId=$PROJECT_ID --datasetName=$DATASET_NAME --tableName=$TABLE_NAME\n // For more information, see https://beam.apache.org/documentation/programming-guide/#configuring-pipeline-options\n PipelineOptionsFactory.register(ExamplePipelineOptions.class);\n ExamplePipelineOptions options = PipelineOptionsFactory.fromArgs(args)\n .withValidation()\n .as(ExamplePipelineOptions.class);\n\n // Create a pipeline and apply transforms.\n Pipeline pipeline = Pipeline.create(options);\n pipeline\n // Create an in-memory PCollection of MyData objects.\n .apply(Create.of(data))\n // Write the data to an exiting BigQuery table.\n .apply(BigQueryIO.\u003cMyData\u003ewrite()\n .to(String.format(\"%s:%s.%s\",\n options.getProjectId(),\n options.getDatasetName(),\n options.getTableName()))\n .withFormatFunction(\n (MyData x) -\u003e new TableRow().set(\"user_name\", x.name).set(\"age\", x.age))\n .withCreateDisposition(CreateDisposition.CREATE_NEVER)\n .withWriteDisposition(WriteDisposition.WRITE_APPEND)\n .withMethod(Write.Method.STORAGE_WRITE_API));\n pipeline.run().waitUntilFinish();\n }\n }\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=dataflow)."]]