Filter cetak (HBase)

Mencetak filter.

Contoh kode

Java

Untuk mempelajari cara menginstal dan menggunakan library klien untuk Bigtable, lihat Library klien Bigtable.

Untuk melakukan autentikasi ke Bigtable, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, baca Menyiapkan autentikasi untuk lingkungan pengembangan lokal.

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();
  }
}

Langkah selanjutnya

Untuk menelusuri dan memfilter contoh kode untuk produk Google Cloud lainnya, lihat browser contoh Google Cloud.