Imprimir filtros (HBase)

Filtros de impresiones.

Código de ejemplo

Java

Para saber cómo instalar y usar la biblioteca de cliente de Bigtable, consulta el artículo Bibliotecas de cliente de Bigtable.

Para autenticarte en Bigtable, configura las credenciales predeterminadas de la aplicación. Para obtener más información, consulta el artículo Configurar la autenticación en un entorno de desarrollo local.

import com.google.cloud.bigtable.hbase.BigtableConfiguration;
import java.io.IOException;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.filter.BinaryComparator;
import org.apache.hadoop.hbase.filter.ColumnCountGetFilter;
import org.apache.hadoop.hbase.filter.ColumnPaginationFilter;
import org.apache.hadoop.hbase.filter.ColumnRangeFilter;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
import org.apache.hadoop.hbase.filter.FamilyFilter;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.FilterList;
import org.apache.hadoop.hbase.filter.FilterList.Operator;
import org.apache.hadoop.hbase.filter.QualifierFilter;
import org.apache.hadoop.hbase.filter.RandomRowFilter;
import org.apache.hadoop.hbase.filter.RegexStringComparator;
import org.apache.hadoop.hbase.filter.RowFilter;
import org.apache.hadoop.hbase.filter.SkipFilter;
import org.apache.hadoop.hbase.filter.ValueFilter;
import org.apache.hadoop.hbase.util.Bytes;

public class Filters {

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

  public static void readWithFilter(
      String projectId, String instanceId, String tableId, Scan scan) {
    // 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 (Connection connection = BigtableConfiguration.connect(projectId, instanceId)) {
      Table table = connection.getTable(TableName.valueOf(tableId));

      ResultScanner rows = table.getScanner(scan);

      for (Result row : rows) {
        printRow(row);
      }
    } catch (IOException e) {
      System.out.println(
          "Unable to initialize service client, as a network error occurred: \n" + e.toString());
    }
  }

  private static void printRow(Result row) {
    System.out.printf("Reading data for %s%n", Bytes.toString(row.rawCells()[0].getRowArray()));
    String colFamily = "";
    for (Cell cell : row.rawCells()) {
      String currentFamily = Bytes.toString(cell.getFamilyArray());
      if (!currentFamily.equals(colFamily)) {
        colFamily = currentFamily;
        System.out.printf("Column Family %s%n", colFamily);
      }
      System.out.printf(
          "\t%s: %s @%s%n",
          Bytes.toString(cell.getQualifierArray()),
          Bytes.toString(cell.getValueArray()),
          cell.getTimestamp());
    }
    System.out.println();
  }
}

Siguientes pasos

Para buscar y filtrar ejemplos de código de otros Google Cloud productos, consulta el Google Cloud navegador de ejemplos.