Tabelas: esquema repetido aninhado

Como especificar colunas aninhadas e repetidas no esquema.

Páginas de documentação que incluem esta amostra de código

Amostra de código

Go

Antes de testar essa amostra, siga as instruções de configuração para Go no Guia de início rápido do BigQuery: como usar bibliotecas de cliente. Para mais informações, consulte a documentação de referência da API BigQuery em Go. 

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/bigquery"
)

// createTableComplexSchema demonstrates creating a BigQuery table and specifying a complex schema that includes
// an array of Struct types.
func createTableComplexSchema(w io.Writer, projectID, datasetID, tableID string) error {
	// projectID := "my-project-id"
	// datasetID := "mydatasetid"
	// tableID := "mytableid"
	ctx := context.Background()

	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %v", err)
	}
	defer client.Close()

	sampleSchema := bigquery.Schema{
		{Name: "id", Type: bigquery.StringFieldType},
		{Name: "first_name", Type: bigquery.StringFieldType},
		{Name: "last_name", Type: bigquery.StringFieldType},
		{Name: "dob", Type: bigquery.DateFieldType},
		{Name: "addresses",
			Type:     bigquery.RecordFieldType,
			Repeated: true,
			Schema: bigquery.Schema{
				{Name: "status", Type: bigquery.StringFieldType},
				{Name: "address", Type: bigquery.StringFieldType},
				{Name: "city", Type: bigquery.StringFieldType},
				{Name: "state", Type: bigquery.StringFieldType},
				{Name: "zip", Type: bigquery.StringFieldType},
				{Name: "numberOfYears", Type: bigquery.StringFieldType},
			}},
	}

	metaData := &bigquery.TableMetadata{
		Schema: sampleSchema,
	}
	tableRef := client.Dataset(datasetID).Table(tableID)
	if err := tableRef.Create(ctx, metaData); err != nil {
		return err
	}
	fmt.Fprintf(w, "created table %s\n", tableRef.FullyQualifiedName())
	return nil
}

Java

Antes de testar essa amostra, siga as instruções de configuração para Java no Guia de início rápido do BigQuery: como usar bibliotecas de cliente. Para mais informações, consulte a documentação de referência da API BigQuery em Java. 

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.Field.Mode;
import com.google.cloud.bigquery.Schema;
import com.google.cloud.bigquery.StandardSQLTypeName;
import com.google.cloud.bigquery.StandardTableDefinition;
import com.google.cloud.bigquery.TableDefinition;
import com.google.cloud.bigquery.TableId;
import com.google.cloud.bigquery.TableInfo;

public class NestedRepeatedSchema {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    String datasetName = "MY_DATASET_NAME";
    String tableName = "MY_TABLE_NAME";
    createTableWithNestedRepeatedSchema(datasetName, tableName);
  }

  public static void createTableWithNestedRepeatedSchema(String datasetName, String tableName) {
    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);

      Schema schema =
          Schema.of(
              Field.of("id", StandardSQLTypeName.STRING),
              Field.of("first_name", StandardSQLTypeName.STRING),
              Field.of("last_name", StandardSQLTypeName.STRING),
              Field.of("dob", StandardSQLTypeName.DATE),
              // create the nested and repeated field
              Field.newBuilder(
                      "addresses",
                      StandardSQLTypeName.STRUCT,
                      Field.of("status", StandardSQLTypeName.STRING),
                      Field.of("address", StandardSQLTypeName.STRING),
                      Field.of("city", StandardSQLTypeName.STRING),
                      Field.of("state", StandardSQLTypeName.STRING),
                      Field.of("zip", StandardSQLTypeName.STRING),
                      Field.of("numberOfYears", StandardSQLTypeName.STRING))
                  .setMode(Mode.REPEATED)
                  .build());

      TableDefinition tableDefinition = StandardTableDefinition.of(schema);
      TableInfo tableInfo = TableInfo.newBuilder(tableId, tableDefinition).build();

      bigquery.create(tableInfo);
      System.out.println("Table with nested and repeated schema created successfully");
    } catch (BigQueryException e) {
      System.out.println("Table was not created. \n" + e.toString());
    }
  }
}

Node.js

Antes de testar essa amostra, siga as instruções de configuração para Node.js no Guia de início rápido do BigQuery: como usar bibliotecas de cliente. Para mais informações, consulte a documentação de referência da API BigQuery Node.js. 

// Import the Google Cloud client library and create a client
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();

async function nestedRepeatedSchema() {
  // Creates a new table named "my_table" in "my_dataset"
  // with nested and repeated columns in schema.

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const datasetId = "my_dataset";
  // const tableId = "my_table";
  // const schema = [
  //   {name: 'Name', type: 'STRING', mode: 'REQUIRED'},
  //   {
  //     name: 'Addresses',
  //     type: 'RECORD',
  //     mode: 'REPEATED',
  //     fields: [
  //       {name: 'Address', type: 'STRING'},
  //       {name: 'City', type: 'STRING'},
  //       {name: 'State', type: 'STRING'},
  //       {name: 'Zip', type: 'STRING'},
  //     ],
  //   },
  // ];

  // For all options, see https://cloud.google.com/bigquery/docs/reference/v2/tables#resource
  const options = {
    schema: schema,
    location: 'US',
  };

  // Create a new table in the dataset
  const [table] = await bigquery
    .dataset(datasetId)
    .createTable(tableId, options);

  console.log(`Table ${table.id} created.`);
}

Python

Antes de testar essa amostra, siga as instruções de configuração para Python no Guia de início rápido do BigQuery: como usar bibliotecas de cliente. Para mais informações, consulte a documentação de referência da API BigQuery em Python. 

# from google.cloud import bigquery
# client = bigquery.Client()
# project = client.project
# dataset_ref = bigquery.DatasetReference(project, 'my_dataset')

schema = [
    bigquery.SchemaField("id", "STRING", mode="NULLABLE"),
    bigquery.SchemaField("first_name", "STRING", mode="NULLABLE"),
    bigquery.SchemaField("last_name", "STRING", mode="NULLABLE"),
    bigquery.SchemaField("dob", "DATE", mode="NULLABLE"),
    bigquery.SchemaField(
        "addresses",
        "RECORD",
        mode="REPEATED",
        fields=[
            bigquery.SchemaField("status", "STRING", mode="NULLABLE"),
            bigquery.SchemaField("address", "STRING", mode="NULLABLE"),
            bigquery.SchemaField("city", "STRING", mode="NULLABLE"),
            bigquery.SchemaField("state", "STRING", mode="NULLABLE"),
            bigquery.SchemaField("zip", "STRING", mode="NULLABLE"),
            bigquery.SchemaField("numberOfYears", "STRING", mode="NULLABLE"),
        ],
    ),
]
table_ref = dataset_ref.table("my_table")
table = bigquery.Table(table_ref, schema=schema)
table = client.create_table(table)  # API request

print("Created table {}".format(table.full_table_id))