Scan apache hadoop hbase table - Java Big Data

Java examples for Big Data:Hadoop

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Description

Scan apache hadoop hbase table

Demo Code

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.util.Bytes;

import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;

public class ScanTable {

    public static void main(String args[]) throws IOException {

        // Instantiating Configuration class
        Configuration config = HBaseConfiguration.create();

        // Instantiating HTable class
        HTable table = new HTable(config, "emp");

        // Instantiating the Scan class
        Scan scan = new Scan();

        // Scanning the required columns
        scan.addColumn(Bytes.toBytes("personal"), Bytes.toBytes("name"));
        scan.addColumn(Bytes.toBytes("personal"), Bytes.toBytes("city"));

        // Getting the scan result
        ResultScanner scanner = table.getScanner(scan);

        // Reading values from scan result
        for (Result result = scanner.next(); result != null; result = scanner
                .next())//from   ww  w. j a v  a2s . c  o m

            System.out.println("Found row : " + result);
        //closing the scanner
        scanner.close();
    }
}

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