Druckfilter (HBase)

Druckfilter

Codebeispiel

Java

Informationen zum Installieren und Verwenden der Clientbibliothek für Bigtable finden Sie unter Bigtable-Clientbibliotheken.

Richten Sie zur Authentifizierung bei Bigtable die Standardanmeldedaten für Anwendungen ein. Weitere Informationen finden Sie unter Authentifizierung für eine lokale Entwicklungsumgebung einrichten.

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();
  }
}

Nächste Schritte

Wenn Sie nach Codebeispielen für andere Google Cloud -Produkte suchen und filtern möchten, können Sie den Google Cloud -Beispielbrowser verwenden.