Configuration class adds HBase configuration files to its object. You can create a configuration object using the create() method of the HbaseConfiguration class as shown below.

Configuration conf = HbaseConfiguration.create();

Step 2: Instantiate the HTable Class

You have a class called HTable, an implementation of Table in HBase. This class is employed to communicate with a single HBase table. While instantiating this class, it accepts the configuration object and the table name as parameters. You can instantiate the HTable class as shown below.

HTable hTable = new HTable(conf, tableName);

Step 3: Instantiate the Put Class

To insert data into HBase Table, the add() method and its variants are employed. This method belongs to Put, therefore instantiate the put class. This class requires the row name you want to insert the data into, in string format. You can instantiate the Put class as shown below.

Put p = new Put(Bytes.toBytes(“row1”));

Step 4: Update an Existing Cell

The add() method of Put class is employed to insert data. It requires 3 byte arrays representing column family, column qualifier (column name), and the value to be inserted, respectively. Insert data into HBase table using the add() method as shown below.

p.add(Bytes.toBytes(“coloumn family “), Bytes.toBytes(“column

name”),Bytes.toBytes(“value”));

p.add(Bytes.toBytes(“personal”),

Bytes.toBytes(“city”),Bytes.toBytes(“Delih”));

Step 5: Save the Data in Table

After inserting the required rows, save the changes by adding the put instance to the put() method of the HTable class as shown below.

hTable.put(p);

Step 6: Close HTable Instance

After creating data in HBase Table, close the HTable instance using the close() method as shown below.

hTable.close();

Given below is the complete program to update data in a particular table.

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.HBaseConfiguration;

import org.apache.hadoop.hbase.client.HTable;

import org.apache.hadoop.hbase.client.Put;

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

public class UpdateData{

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

// Instantiating Configuration class

Configuration config = HBaseConfiguration.create();

// Instantiating HTable class

HTable hTable = new HTable(config, “emp”);

// Instantiating Put class

//accepts a row name

Put p = new Put(Bytes.toBytes(“row1”));

// Updating a cell value

p.add(Bytes.toBytes(“personal”),

Bytes.toBytes(“city”),Bytes.toBytes(“Delih”));

// Saving the put Instance to the HTable.

hTable.put(p);

System.out.println(“data Updated”);

// closing HTable

hTable.close();

}

Compile and execute the above program as shown below.

$javac UpdateData.java

$java UpdateData

The subsequent should be the output:

data Updated

So, this brings us to the end of blog. This Tecklearn ‘How to update data in Table using HBase shell’ helps you with commonly asked questions if you are looking out for a job in HBase and No-SQL Database Domain.

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Components of HBase Cluster

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Create an Eclipse Project for HBase
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HBase Shell
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