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RowMapper with Spring Jdbc Template
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RowMapper is an interface that allows to map a row of the relations with the instance of user-defined class. It iterates the ResultSet internally and adds it into the collection. So we don't need to write a lot of code to fetch the records as ResultSetExtractor.

An interface 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, but don't need to worry about exception handling. SQLExceptions will be caught and handled by the calling JdbcTemplate.

Typically used either for JdbcTemplate's query methods or for out parameters of stored procedures. RowMapper objects are typically stateless and thus reusable, they are an ideal choice for implementing row-mapping logic in a single place.

Example of RowMapper with Spring Jdbc Template

First you make a table in Database Mysql Workbench like employee. The code of table as given below:

CREATE TABLE `employee` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(45) NOT NULL,
  `salary` int(10) unsigned NOT NULL,
  PRIMARY KEY (`id`)
) 
Technologies used to run this Application.
  1. Spring 3.0
  2. Eclipse IDE
  3. JDK 1.6
  4. MySql Workbench 6.2

Let us have working Eclipse IDE in place and follow the following steps to create a Spring application:

Step1. Now you create a simple Java Project using Eclipse IDE. Follow the option File -> New -> Project and finally select Java Project wizard from the wizard list. Now name your project as RowMapperwithSpring using the wizard window as given below.

Add spring jar files

Step2. Now add spring jar in your project, To do this, right click on your project name RowMapperwithSpring and then follow the following option available in context menu: Build Path -> Configure Build Path to display the Java Build Path window as given below. There are some jar files required to run this application, To load the jar files in eclipse IDE, Right click on your project - Build Path - Add external archives - select all the required jar files - finish.

  1. antlr-runtime-3.0.1
  2. org.springframework.aop-3.1.0
  3. org.springframework.asm-3.1.0.
  4. org.springframework.aspects-3.1.0.
  5. org.springframework.beans-3.1.0.
  6. org.springframework.context.support-3.1.0.
  7. org.springframework.context-3.1.0.
  8. org.springframework.core-3.1.0.
  9. spring-expression-3.1.0.RELEASE.jar
  10. com.springsource.org.aopalliance-1.0.0.jar
  11. org.apache.commons.logging-1.1.1.jar
  12. org.springframework.jdbc-3.0.0.M2.jar
  13. org.springframework.transaction-3.1.0.RELEASE.jar
  14. mysql-connector-java-5.1.23-bin.jar
  15. commons-dbcp-1.4.jar
  16. ojdbc14.jar
Create Java class file

Step3. Now you create simply java file with any name. First we need to create a package with any name like com.r4r. To do this, Right click on src in package explorer section and follow the option : New -> Package. and then Right click on package(com.r4r) - New - class - Write the class name e.g. Employee - finish. Write the following code:

package com.r4r;
public class Employee {
	private int id;  
	private String name;  
	private int salary;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}

	public String toString(){  
	    return id+" "+name+" "+salary;  
	}
}

Step4. Now you create another Java class named EmployeeDao.java.

package com.r4r;

import java.sql.ResultSet;  
import java.sql.SQLException;  
import java.util.List;  
import org.springframework.jdbc.core.JdbcTemplate;  
import org.springframework.jdbc.core.RowMapper;  
  
public class EmployeeDao {  
private JdbcTemplate jdbctemplate;  
  
public void setTemplate(JdbcTemplate jdbctemplate) {  
    this.jdbctemplate = jdbctemplate;  
}  
  
public List<Employee> getAllEmployeesRowMapper(){  
return template.query("select * from employee",new RowMapper<Employee>(){  
 @Override  
public Employee mapRow(ResultSet rs, int rownumber) throws SQLException {  
        Employee e=new Employee();  
        e.setId(rs.getInt(1));  
        e.setName(rs.getString(2));  
        e.setSalary(rs.getInt(3));  
        return e;  
    }  
    });  
}  
}

Step5. Now create the xml file click on src- new -file -give the file name like applicationContext.xml then finish.

<?xml version="1.0" encoding="UTF-8"?>  
<beans  
    xmlns="http://www.springframework.org/schema/beans"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xmlns:p="http://www.springframework.org/schema/p"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans   
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">  
  
<bean id="ds" 
      class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/amit"/>
        <property name="username" value="root"/>
        <property name="password" value=""/>
    </bean>   
  
<bean id="jdbctemplate" class="org.springframework.jdbc.core.JdbcTemplate">  
<property name="dataSource" ref="ds"></property>  
</bean>  
  
<bean id="employeedao" class="com.r4r.EmployeeDao">  
<property name="jdbctemplate" ref="jdbctemplate"></property>  
</bean>  
  
</beans>  

Step6. Now Create the java Main class (MainApp.java).

package com.r4r;

import java.util.List;  
import org.springframework.context.ApplicationContext;  
import org.springframework.context.support.ClassPathXmlApplicationContext;  
public class MainApp {  
public static void main(String[] args) {  
    ApplicationContext ctx=
	new ClassPathXmlApplicationContext("applicationContext.xml");  
    EmployeeDao dao=(EmployeeDao)ctx.getBean("employeedao");  
    List<Employee> list=dao.getAllEmployeesRowMapper();  
          
    for(Employee e:list)  
        System.out.println(e);  
}  
}  
Run Application

Now run the Application you see the following output:

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