List models

Lists all existing models in a dataset.

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For detailed documentation that includes this code sample, see the following:

• List models

Code sample

Go

Before trying this sample, follow the Go setup instructions in the BigQuery quickstart using client libraries. For more information, see the BigQuery Go API reference documentation.

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/bigquery"
	"google.golang.org/api/iterator"
)

// listModels demonstrates iterating through the collection of ML models in a dataset
// and printing a basic identifier of the model.
func listModels(w io.Writer, projectID, datasetID string) error {
	// projectID := "my-project-id"
	// datasetID := "mydataset"
	ctx := context.Background()

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

	fmt.Fprintf(w, "Models contained in dataset %q\n", datasetID)
	it := client.Dataset(datasetID).Models(ctx)
	for {
		m, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		fmt.Fprintf(w, "Model: %s\n", m.FullyQualifiedName())
	}
	return nil
}

Java

Before trying this sample, follow the Java setup instructions in the BigQuery quickstart using client libraries. For more information, see the BigQuery Java API reference documentation.

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

import com.google.api.gax.paging.Page;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQuery.ModelListOption;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Model;

public class ListModels {

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

  public static void listModels(String datasetName) {
    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();

      Page<Model> models = bigquery.listModels(datasetName, ModelListOption.pageSize(100));
      if (models == null) {
        System.out.println("Dataset does not contain any models.");
        return;
      }
      models
          .iterateAll()
          .forEach(model -> System.out.printf("Success! Model ID: %s", model.getModelId()));
    } catch (BigQueryException e) {
      System.out.println("Models not listed in dataset due to error: \n" + e.toString());
    }
  }
}

What's next

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