Read using a family regex filter

Creates a limiting filter on a column family with a regex.

Explore further

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

Code sample

C++

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

namespace cbt = ::google::cloud::bigtable;
using ::google::cloud::StatusOr;
[](cbt::Table table) {
  cbt::Filter filter = cbt::Filter::FamilyRegex("stats_.*$");
  // Read and print the rows.
  for (StatusOr<cbt::Row>& row :
       table.ReadRows(cbt::RowSet(cbt::RowRange::InfiniteRange()), filter)) {
    if (!row) throw std::move(row).status();
    std::cout << row->row_key() << " = ";
    for (auto const& cell : row->cells()) {
      std::cout << "[" << cell.family_name() << ", "
                << cell.column_qualifier() << ", " << cell.value() << "],";
    }
    std::cout << "\n";
  }
}

C#

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

    /// <summary>
    /// /// Read using a family regex filter from an existing table.
    ///</summary>
    /// <param name="projectId">Your Google Cloud Project ID.</param>
    /// <param name="instanceId">Your Google Cloud Bigtable Instance ID.</param>
    /// <param name="tableId">Your Google Cloud Bigtable table ID.</param>

    public string filterLimitColFamilyRegex(
String projectId, String instanceId, String tableId)
    {
        // A filter that matches cells whose column family satisfies the given regex
        RowFilter filter = RowFilters.FamilyNameRegex("stats_.*$");
        return readFilter(projectId, instanceId, tableId, filter);
    }

Go

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

func filterLimitColFamilyRegex(w io.Writer, projectID, instanceID string, tableName string) error {
	filter := bigtable.FamilyFilter("stats_.*$")
	return readWithFilter(w, projectID, instanceID, tableName, filter)
}

Java

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

public static void filterLimitColFamilyRegex() {
  // TODO(developer): Replace these variables before running the sample.
  String projectId = "my-project-id";
  String instanceId = "my-instance-id";
  String tableId = "mobile-time-series";
  filterLimitColFamilyRegex(projectId, instanceId, tableId);
}

public static void filterLimitColFamilyRegex(
    String projectId, String instanceId, String tableId) {
  // A filter that matches cells whose column family satisfies the given regex
  Filter filter = FILTERS.family().regex("stats_.*$");
  readFilter(projectId, instanceId, tableId, filter);
}

Node.js

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

const filter = {
  family: /stats_.*$/,
};
readWithFilter(filter);

PHP

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

use Google\Cloud\Bigtable\BigtableClient;
use Google\Cloud\Bigtable\Filter;

/**
 * Create a limiting filter on a column family with a regex
 *
 * @param string $projectId The Google Cloud project ID
 * @param string $instanceId The ID of the Bigtable instance
 * @param string $tableId The ID of the table to read from
 */
function filter_limit_col_family_regex(
    string $projectId,
    string $instanceId,
    string $tableId
): void {
    // Connect to an existing table with an existing instance.
    $dataClient = new BigtableClient([
        'projectId' => $projectId,
    ]);
    $table = $dataClient->table($instanceId, $tableId);

    $filter = Filter::family()->regex('stats_.*$');

    $rows = $table->readRows([
        'filter' => $filter
    ]);

    foreach ($rows as $key => $row) {
        // The "print_row" helper function is defined in https://cloud.google.com/bigtable/docs/samples/bigtable-reads-print
        print_row($key, $row);
    }
}

Python

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

def filter_limit_col_family_regex(project_id, instance_id, table_id):
    client = bigtable.Client(project=project_id, admin=True)
    instance = client.instance(instance_id)
    table = instance.table(table_id)

    rows = table.read_rows(
        filter_=row_filters.FamilyNameRegexFilter("stats_.*$".encode("utf-8"))
    )
    for row in rows:
        print_row(row)

Ruby

To learn how to install and use the client library for Bigtable, see Bigtable client libraries.

To authenticate to Bigtable, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

# instance_id = "my-instance"
# table_id    = "my-table"
filter = Google::Cloud::Bigtable::RowFilter.family "stats_.*$"
read_with_filter instance_id, table_id, filter

What's next

To search and filter code samples for other Google Cloud products, see the Google Cloud sample browser.