Spring JDBC - RowMapper Interface

The org.springframework.jdbc.core.RowMapper<T> interface is used by JdbcTemplate for mapping rows of a ResultSet on a per-row basis. Implementations of this interface perform the actual work of mapping each row to a result object. SQLExceptions if any thrown will be caught and handled by the calling JdbcTemplate.

Interface Declaration

Following is the declaration for org.springframework.jdbc.core.RowMapper<T> interface −

public interface RowMapper<T>


Step 1 − Create a JdbcTemplate object using a configured datasource.

Step 2 − Create a StudentMapper object implementing RowMapper interface.

Step 3 − Use JdbcTemplate object methods to make database operations while using StudentMapper object.

Following example will demonstrate how to read a query using spring jdbc. We'll map read records from Student Table to Student object using StudentMapper object.


String SQL = "select * from Student";
List <Student> students = jdbcTemplateObject.query(SQL, new StudentMapper());


SQL − Read query to read all student records.
jdbcTemplateObject − StudentJDBCTemplate object to read student records from database.
StudentMapper − StudentMapper object to map student records to student objects.

To understand the above-mentioned concepts related to Spring JDBC, let us write an example which will read a query and map result using StudentMapper object. To write our example, let us have a working Eclipse IDE in place and use the following steps to create a Spring application.

Step  Description

1 Update the project Student created under chapter Spring JDBC - First Application.

2 Update the bean configuration and run the application as explained below.

Following is the content of the Student.java file.

package com.javahubpoint;

public class Student {
   private Integer age;
   private String name;
   private Integer id;
   public void setAge(Integer age) {
      this.age = age;
   public Integer getAge() {
      return age;
   public void setName(String name) {
      this.name = name;
   public String getName() {
      return name;
   public void setId(Integer id) {
      this.id = id;
   public Integer getId() {
      return id;

Following is the content of the StudentMapper.java file.

package com.javahubpoint;

import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;

public class StudentMapper implements RowMapper<Student> {

   public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
      Student student = new Student();
      return student;

Following is the content of the Data Access Object interface file StudentDao.java.

package com.javahubpoint;

import java.util.List;
import javax.sql.DataSource;

public interface StudentDao {
      * This is the method to be used to initialize
      * database resources ie. connection.
   public void setDataSource(DataSource ds);
      * This is the method to be used to list down
      * all the records from the Student table.
   public List<Student> listStudents();   

Following is the implementation class file StudentJDBCTemplate.java for the defined DAO interface StudentDAO.

package com.javahubpoint;

import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;

public class StudentJDBCTemplate implements StudentDao {
   private DataSource dataSource;
   private JdbcTemplate jdbcTemplateObject;
   public void setDataSource(DataSource dataSource) {
      this.dataSource = dataSource;
      this.jdbcTemplateObject = new JdbcTemplate(dataSource);

   public List<Student> listStudents() {
      String SQL = "select * from Student";
      List <Student> students = jdbcTemplateObject.query(SQL, new StudentMapper());
      return students;

Following is the content of the MainApp.java file

package com.javahubpoint;

import java.util.List
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.javahubpoint.StudentJDBCTemplate;

public class MainApp {

   public static void main(String[] args) {

      ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
      StudentJDBCTemplate studentJDBCTemplate = (StudentJDBCTemplate)context.getBean("studentJDBCTemplate");
      System.out.println("------Listing Multiple Records--------" );
      List<Student> students = studentJDBCTemplate.listStudents();
      for (Student record : students) {
         System.out.print("ID : " + record.getId() );
         System.out.print(", Name : " + record.getName() );
         System.out.println(", Age : " + record.getAge());

Following is the configuration file Beans.xml.

<?xml version = "1.0" encoding = "UTF-8"?>
<beans xmlns = "http://www.springframework.org/schema/beans"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation = "http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">

   <!-- Initialization for data source -->
   <bean id = "dataSource" 
      class = "org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name = "driverClassName" value = "com.mysql.cj.jdbc.Driver"/>
      <property name = "url" value = "jdbc:mysql://localhost:3306/TEST"/>
      <property name = "username" value = "root"/>
      <property name = "password" value = "admin"/>

   <!-- Definition for studentJDBCTemplate bean -->
   <bean id = "studentJDBCTemplate" 
      class = "com.javahubpoint.StudentJDBCTemplate">
      <property name = "dataSource" ref = "dataSource" />    

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

------Listing Multiple Records--------

ID : 1, Name : Zara, Age : 17

ID : 3, Name : Ayan, Age : 18