CRUDExample.java

package client;

// cc CRUDExample Example application using all of the basic access methods (v1.0 and later)
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Put;
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.util.Bytes;
import util.HBaseHelper;

import java.io.IOException;

public class CRUDExample {

  public static void main(String[] args) throws IOException {
    // vv CRUDExample
    Configuration conf = HBaseConfiguration.create();

    // ^^ CRUDExample
    HBaseHelper helper = HBaseHelper.getHelper(conf);
    helper.dropTable("testtable");
    helper.createTable("testtable", "colfam1", "colfam2");

    // vv CRUDExample
    try (
      Connection connection = ConnectionFactory.createConnection(conf);
      Table table = connection.getTable(TableName.valueOf("testtable"));
    ) {
      Put put = new Put(Bytes.toBytes("row1"));
      put.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"),
        Bytes.toBytes("val1"));
      put.addColumn(Bytes.toBytes("colfam2"), Bytes.toBytes("qual2"),
        Bytes.toBytes("val2"));
      table.put(put);

      Scan scan = new Scan();
      ResultScanner scanner = table.getScanner(scan);
      for (Result result2 : scanner) {
        while (result2.advance())
          System.out.println("Cell: " + result2.current());
      }

      Get get = new Get(Bytes.toBytes("row1"));
      get.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"));
      Result result = table.get(get);
      System.out.println("Get result: " + result);
      byte[] val = result.getValue(Bytes.toBytes("colfam1"),
        Bytes.toBytes("qual1"));
      System.out.println("Value only: " + Bytes.toString(val));

      Delete delete = new Delete(Bytes.toBytes("row1"));
      delete.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"));
      table.delete(delete);

      Scan scan2 = new Scan();
      ResultScanner scanner2 = table.getScanner(scan2);
      for (Result result2 : scanner2) {
        System.out.println("Scan: " + result2);
      }
    }
    // ^^ CRUDExample
    helper.close();
  }
}