Data Catalog Client Libraries

This page shows how to get started with the Cloud Client Libraries for the Data Catalog API. Read more about the client libraries for Cloud APIs, including the older Google APIs Client Libraries, in Client Libraries Explained.

Installing the client library

C#

For more information, see Setting Up a C# Development Environment.

Go

For more information, see Setting Up a Go Development Environment.

Java

For more information, see Setting Up a Java Development Environment.

If you are using Maven, add this to your pom.xml file:

Maven:
<dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-datacatalog</artifactId>
    <version>insert datacatalog-library-version here</version>
</dependency>
If you are using Gradle, add this to your dependencies: 
compile group: 'com.google.cloud', name: 'google-cloud-datacatalog', version: 'insert datacatalog-library-version here'

Node.js

For more information, see Setting Up a Node.js Development Environment.

npm install --save @google-cloud/datacatalog

PHP

For more information, see Using PHP on Google Cloud.

Python

For more information, see Setting Up a Python Development Environment.

pip install --upgrade google-cloud-datacatalog

Ruby

For more information, see Setting Up a Ruby Development Environment.

Setting up authentication

To run the client library, you must first set up authentication by creating a service account and setting an environment variable. Complete the following steps to set up authentication. For other ways to authenticate, see the GCP authentication documentation.

Cloud Console

  1. En Cloud Console, ve a la página Crea una clave de cuenta de servicio.

    Ir a la página Crea una clave de la cuenta de servicio
  2. En la lista Cuenta de servicio, selecciona Cuenta de servicio nueva.
  3. Ingresa un nombre en el campo Nombre de cuenta de servicio.

  4. En la lista Función, selecciona Proyecto > Propietario.

  5. Haz clic en Crear. Se descargará un archivo JSON que contiene tus claves a tu computadora.

Línea de comandos

Puedes ejecutar los siguientes comandos con el SDK de Cloud en tu máquina local o en Cloud Shell.

  1. Crea la cuenta de servicio. Reemplaza NAME por un nombre para la cuenta de servicio. 

    gcloud iam service-accounts create NAME

  2. Otorga permisos a la cuenta de servicio. Reemplaza PROJECT_ID por el ID del proyecto. 

    gcloud projects add-iam-policy-binding PROJECT_ID --member="serviceAccount:NAME@PROJECT_ID.iam.gserviceaccount.com" --role="roles/owner"

  3. Genera el archivo de claves. Reemplaza FILE_NAME por un nombre para el archivo de claves. 

    gcloud iam service-accounts keys create FILE_NAME.json --iam-account=NAME@PROJECT_ID.iam.gserviceaccount.com

Configura la variable de entorno GOOGLE_APPLICATION_CREDENTIALS para proporcionar credenciales de autenticación al código de la aplicación. Reemplaza [PATH] por la ruta de acceso del archivo JSON que contiene la clave de tu cuenta de servicio. Esta variable solo se aplica a la sesión actual de shell. Por lo tanto, si abres una sesión nueva, deberás volver a configurar la variable.

Linux o macOS

export GOOGLE_APPLICATION_CREDENTIALS="[PATH]"

Por ejemplo:

export GOOGLE_APPLICATION_CREDENTIALS="/home/user/Downloads/my-key.json"

Windows

Con PowerShell:

$env:GOOGLE_APPLICATION_CREDENTIALS="[PATH]"

Por ejemplo:

$env:GOOGLE_APPLICATION_CREDENTIALS="C:\Users\username\Downloads\my-key.json"

Con el símbolo del sistema:

set GOOGLE_APPLICATION_CREDENTIALS=[PATH]

Using the client library

The following example shows how to use the client library.

Java

For more information, see the Data Catalog Java API reference documentation.

samples/snippets/src/main/java/com/example/datacatalog/LookupEntryBigQueryDataset.java 
import com.google.cloud.datacatalog.v1.DataCatalogClient;
import com.google.cloud.datacatalog.v1.Entry;
import com.google.cloud.datacatalog.v1.LookupEntryRequest;

public class LookupEntryBigQueryDataset {

  /**
   * Lookup the Data Catalog entry referring to a BigQuery Dataset
   *
   * @param projectId The project ID to which the Dataset belongs, e.g. 'my-project'
   * @param datasetId The dataset ID to which the Catalog Entry refers, e.g. 'my_dataset'
   */
  public static void lookupEntry(String projectId, String datasetId) {
    // String projectId = "my-project"
    // String datasetId = "my_dataset"

    // Get an entry by the resource name from the source Google Cloud Platform service.
    String linkedResource =
        String.format("//bigquery.googleapis.com/projects/%s/datasets/%s", projectId, datasetId);
    LookupEntryRequest request =
        LookupEntryRequest.newBuilder().setLinkedResource(linkedResource).build();

    // Alternatively, lookup by the SQL name of the entry would have the same result:
    // String sqlResource = String.format("bigquery.dataset.`%s`.`%s`", projectId, datasetId);
    // LookupEntryRequest request =
    // LookupEntryRequest.newBuilder().setSqlResource(sqlResource).build();

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the "close" method on the client to safely clean up any remaining background resources.
    try (DataCatalogClient dataCatalogClient = DataCatalogClient.create()) {
      Entry entry = dataCatalogClient.lookupEntry(request);
      System.out.printf("Entry name: %s\n", entry.getName());
    } catch (Exception e) {
      System.out.print("Error during lookupEntryBigQueryDataset:\n" + e.toString());
    }
  }
}

Node.js

For more information, see the Data Catalog Node.js API reference documentation.

datacatalog/cloud-client/lookupEntry.js 
// -------------------------------
// Import required modules.
// -------------------------------
const {DataCatalogClient} = require('@google-cloud/datacatalog').v1;
const datacatalog = new DataCatalogClient();

const lookup = async () => {
  // TODO(developer): Uncomment the following lines before running the sample.
  // const projectId = 'my-project'
  // const datasetId = 'my_dataset'
  const resourceName = `//bigquery.googleapis.com/projects/${projectId}/datasets/${datasetId}`;
  const request = {linkedResource: resourceName};
  const [result] = await datacatalog.lookupEntry(request);
  return result;
};

const response = await lookup();
console.log(response);

Python

For more information, see the Data Catalog Python API reference documentation.

samples/snippets/lookup_entry.py 
"""Retrieves Data Catalog entry for the given BigQuery Dataset."""
from google.cloud import datacatalog_v1

datacatalog = datacatalog_v1.DataCatalogClient()

resource_name = '//bigquery.googleapis.com/projects/{}/datasets/{}'\
    .format(project_id, dataset_id)

return datacatalog.lookup_entry(request={'linked_resource': resource_name})

Additional resources