ResultSetHandler interface


The org.apache.commons.dbutils.ResultSetHandler interface is responsible to convert ResultSets into objects.

Class Declaration

Following is the declaration for org.apache.commons.dbutils.ResultSetHandler class −

public interface ResultSetHandler<T>


  • Step 1 − Create a connection object.

  • Step 2 − Create implementation of ResultSetHandler.

  • Step 3 − Pass resultSetHandler to QueryRunner object, and make database operations.


Following example will demonstrate how to map a record using ResultSetHandler class. We'll read one of the available record in Employee Table.


Employee emp = queryRunner.query(conn, "SELECT * FROM employees WHERE first=?", resultHandler, "Sumit");


  • resultHandler − ResultSetHandler object to map result set to Employee object.

  • queryRunner − QueryRunner object to read employee object from database.

To understand the above-mentioned concepts related to DBUtils, let us write an example which will run a read query. To write our example, let us create a sample application.

Step Description
1 Update the file created under chapter DBUtils - First Application.
2 Compile and run the application as explained below.

Following is the content of the

public class Employee {
   private int id;
   private int age;
   private String first;
   private String last;
   public int getId() {
      return id;
   public void setId(int id) { = id;
   public int getAge() {
      return age;
   public void setAge(int age) {
      this.age = age;
   public String getFirst() {
      return first;
   public void setFirst(String first) {
      this.first = first;
   public String getLast() {
      return last;
   public void setLast(String last) {
      this.last = last;

Following is the content of the file.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.Arrays;

import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;

public class MainApp {
   // JDBC driver name and database URL
   static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
   static final String DB_URL = "jdbc:mysql://localhost:3306/emp";

   //  Database credentials
   static final String USER = "root";
   static final String PASS = "admin";

   public static void main(String[] args) throws SQLException {
      Connection conn = null;
      QueryRunner queryRunner = new QueryRunner();
      //Step 1: Register JDBC driver

      //Step 2: Open a connection
      System.out.println("Connecting to database...");
      conn = DriverManager.getConnection(DB_URL, USER, PASS);

      //Step 3: Create a ResultSet Handler to handle Employee Beans
      ResultSetHandler<Object[]> handler = new ResultSetHandler<Object[]>() {
         public Object[] handle(ResultSet rs) throws SQLException {
            if (! {
               return null;
            ResultSetMetaData meta = rs.getMetaData();
            int cols = meta.getColumnCount();
            Object[] result = new Object[cols];

            for (int i = 0; i < cols; i++) {
               result[i] = rs.getObject(i + 1);
            return result;

      try {
         Object[] result  = queryRunner.query(conn, "SELECT * FROM employees WHERE id=?",
            handler, 103);
         //Display values
         System.out.print("Result: " + Arrays.toString(result));            
      } finally {

Once you are done creating the source files, let us run the application. If everything is fine with your application, it will print the following message.

Connecting to database...
Result: [103, 33, Sumit, Mittal]