Java Hub Point: Spring JDBC

The following example will demonstrate how to create a query using Insert query with the help of Spring JDBC.

We'll insert a few records in Student Table.

String insertQuery = "insert into Student (name, age) values (?, ?)";
jdbcTemplateObject.update( insertQuery, name, age);

Where,
insertQuery − Insert query having placeholders.
jdbcTemplateObject − StudentJDBCTemplate object to insert student object in database.

To understand the above-mentioned concepts , let us write an example which will insert a query.

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:-

Update the project Student created under chapter Spring JDBC - First Application.
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 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 create
* a record in the Student table.
*/
public void create(String name, Integer age);

/**
* This is the method to be used to list down
* all the records from the Student table.
*/
public List<Student> listStudents();
}

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();
student.setId(rs.getInt("id"));
student.setName(rs.getString("name"));
student.setAge(rs.getInt("age"));
return student;
}
}

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 void create(String name, Integer age) {
String insertQuery = "insert into Student (name, age) values (?, ?)";
jdbcTemplateObject.update( insertQuery, name, age);
System.out.println("Created Record Name = " + name + " Age = " + age);
return;
}

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("------Records Creation--------" );
studentJDBCTemplate.create("Zara", 11);
studentJDBCTemplate.create("Nuha", 2);
studentJDBCTemplate.create("Ayan", 15);
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 ">

<bean id = "studentJDBCTemplate"
class = "com.javahubpoint.StudentJDBCTemplate">
<property name = "dataSource" ref = "dataSource" />
</bean>
</beans>

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.

------Records Creation--------

Created Record Name = Zara Age = 11

Created Record Name = Nuha Age = 2

Created Record Name = Ayan Age = 15

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

ID : 1, Name : Zara, Age : 11

ID : 2, Name : Nuha, Age : 2

ID : 3, Name : Ayan, Age : 15

Java Hub Point

Pages

Spring JDBC - Create Query