Read and print

Read and print a row.

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.

using Google.Cloud.Bigtable.Common.V2;
using Google.Cloud.Bigtable.V2;
using System;
using System.Linq;



namespace Reads
{
    public class ReadSnippets
    {
        // Write your code here.
        // ...
        public string printRow(Row row)
        {
            String result = $"Reading data for {row.Key.ToStringUtf8()}\n";
            foreach (Family family in row.Families)
            {
                result += $"Column Family {family.Name}\n";

                foreach (Column column in family.Columns)
                {
                    foreach (Cell cell in column.Cells)
                    {
                        result += $"\t{column.Qualifier.ToStringUtf8()}: {cell.Value.ToStringUtf8()} @{cell.TimestampMicros} {cell.Labels}\n";
                    }
                }
            }
            result += "\n";
            Console.WriteLine(result);
            return result;
        }
    }
}

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 printRow(w io.Writer, row bigtable.Row) {
	fmt.Fprintf(w, "Reading data for %s:\n", row.Key())
	for columnFamily, cols := range row {
		fmt.Fprintf(w, "Column Family %s\n", columnFamily)
		for _, col := range cols {
			qualifier := col.Column[strings.IndexByte(col.Column, ':')+1:]
			fmt.Fprintf(w, "\t%s: %s @%d\n", qualifier, col.Value, col.Timestamp)
		}
	}
	fmt.Fprintln(w)
}

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.

import static com.google.cloud.bigtable.data.v2.models.Filters.FILTERS;

import com.google.api.gax.rpc.ServerStream;
import com.google.cloud.bigtable.data.v2.BigtableDataClient;
import com.google.cloud.bigtable.data.v2.models.Filters;
import com.google.cloud.bigtable.data.v2.models.Query;
import com.google.cloud.bigtable.data.v2.models.Row;
import com.google.cloud.bigtable.data.v2.models.RowCell;
import com.google.cloud.bigtable.data.v2.models.TableId;
import java.io.IOException;

public class Reads {

  // Write your code here.
  // ...

  private static void printRow(Row row) {
    System.out.printf("Reading data for %s%n", row.getKey().toStringUtf8());
    String colFamily = "";
    for (RowCell cell : row.getCells()) {
      if (!cell.getFamily().equals(colFamily)) {
        colFamily = cell.getFamily();
        System.out.printf("Column Family %s%n", colFamily);
      }
      System.out.printf(
          "\t%s: %s @%s%n",
          cell.getQualifier().toStringUtf8(), cell.getValue().toStringUtf8(), cell.getTimestamp());
    }
    System.out.println();
  }
}

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 {Bigtable} = require('@google-cloud/bigtable');
  const bigtable = new Bigtable();

  // TODO(developer): Uncomment these variables before running the sample

  // const instanceId = 'YOUR_INSTANCE_ID';
  // const tableId = 'YOUR_TABLE_ID';
  const instance = bigtable.instance(instanceId);
  const table = instance.table(tableId);

  // Write your code here.
  // ...

  function printRow(rowkey, rowData) {
    console.log(`Reading data for ${rowkey}:`);

    for (const columnFamily of Object.keys(rowData)) {
      const columnFamilyData = rowData[columnFamily];
      console.log(`Column Family ${columnFamily}`);

      for (const columnQualifier of Object.keys(columnFamilyData)) {
        const col = columnFamilyData[columnQualifier];

        for (const cell of col) {
          const labels = cell.labels.length
            ? ` [${cell.labels.join(',')}]`
            : '';
          console.log(
            `\t${columnQualifier}: ${cell.value} @${cell.timestamp}${labels}`
          );
        }
      }
    }
    console.log();
  }
}

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.

// Helper function for printing the row data
function print_row(string $key, array $row): void
{
    printf('Reading data for row %s' . PHP_EOL, $key);
    foreach ((array) $row as $family => $cols) {
        printf('Column Family %s' . PHP_EOL, $family);
        foreach ($cols as $col => $data) {
            for ($i = 0; $i < count($data); $i++) {
                printf(
                    "\t%s: %s @%s%s" . PHP_EOL,
                    $col,
                    $data[$i]['value'],
                    $data[$i]['timeStamp'],
                    $data[$i]['labels'] ? sprintf(' [%s]', $data[$i]['labels']) : ''
                );
            }
        }
    }
    print(PHP_EOL);
}

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.

from google.cloud import bigtable
import google.cloud.bigtable.row_filters as row_filters
from google.cloud.bigtable.row_set import RowSet

# Write your code here.
# ...


def print_row(row):
    print("Reading data for {}:".format(row.row_key.decode("utf-8")))
    for cf, cols in sorted(row.cells.items()):
        print("Column Family {}".format(cf))
        for col, cells in sorted(cols.items()):
            for cell in cells:
                labels = (
                    " [{}]".format(",".join(cell.labels)) if len(cell.labels) else ""
                )
                print(
                    "\t{}: {} @{}{}".format(
                        col.decode("utf-8"),
                        cell.value.decode("utf-8"),
                        cell.timestamp,
                        labels,
                    )
                )
    print("")

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.

# Import google bigtable client lib
require "google/cloud/bigtable"
# Write your code here.
# ...
def print_row row
  puts "Reading data for #{row.key}:"

  row.cells.each do |column_family, data|
    puts "Column Family #{column_family}"
    data.each do |cell|
      labels = !cell.labels.empty? ? " [#{cell.labels.join ','}]" : ""
      puts "\t#{cell.qualifier}: #{cell.value} @#{cell.timestamp}#{labels}"
    end
  end
  puts "\n"
end

What's next

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