读取并打印

读取并打印行。

代码示例

C#

如需了解如何安装和使用 Bigtable 的客户端库，请参阅 Bigtable 客户端库。

如需向 Bigtable 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅 为本地开发环境设置身份验证。

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



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

如需了解如何安装和使用 Bigtable 的客户端库，请参阅 Bigtable 客户端库。

如需向 Bigtable 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅 为本地开发环境设置身份验证。

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

如需了解如何安装和使用 Bigtable 的客户端库，请参阅 Bigtable 客户端库。

如需向 Bigtable 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅 为本地开发环境设置身份验证。

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();
  }
}

PHP

如需了解如何安装和使用 Bigtable 的客户端库，请参阅 Bigtable 客户端库。

如需向 Bigtable 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅 为本地开发环境设置身份验证。

// 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);
}

Ruby

如需了解如何安装和使用 Bigtable 的客户端库，请参阅 Bigtable 客户端库。

如需向 Bigtable 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅 为本地开发环境设置身份验证。

# 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

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅Google Cloud 示例浏览器。