Working with Spring Boot Named Parameter JdbcTemplate

author-image  By Dhiraj, 04 February, 2017   9K

This is yet another post of using namedparameterjdbctemplate to fetch records from DB.In this post we will see how we can perform different crud operations using namedparameterjdbctemplate. We will be creating dao methods respnosible for insert and fetch data from DB using spring jdbc provided namedparameterjdbctemplate.We will be using the artifact spring-boot-starter-jdbc provided by spring boot to configure our spring jdbc configurations.

Environment Setup

1. JDK 8 2. Spring Boot 3. Intellij Idea/ eclipse 4. Maven

Maven Dependencies

spring-boot-starter-parent: provides useful Maven defaults. It also provides a dependency-management section so that you can omit version tags for existing dependencies.

spring-boot-starter-jdbc: provides all the maven dependecies for using JDBC with the Tomcat JDBC connection pool.

pom.xml
    <properties>
        <java.version>1.8</java.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.3.RELEASE</version>
    </parent>
	
    <dependencies>
	<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
	<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
	</dependency>
		
	<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
	    <scope>test</scope>
        </dependency>
    </dependencies>
	
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

Spring Bean Configuration

Application.java
package com.devglan.config;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication(scanBasePackages = "com.devglan")
public class Application {
	

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}
 Other Interesting Posts
Spring 5 Features and Enhancements
Insert Record in DB with Spring Boot JdbcTemplate
Fetch Auto Generated Primary Key Value After Insert Spring Jdbc
Working with Spring Boot Jdbctemplate
Execute Stored Procedure in Spring Jdbc
Spring Security Hibernate Example with complete JavaConfig
Securing REST API with Spring Security Basic Authentication
Websocket spring Boot Integration without STOMP with complete JavaConfig
Spring Boot Spring MVC Example
Spring Boot Thymeleaf Example
Spring Boot MVC with Jsp Example

Following is the model class with getters and setters.

User.java
package com.devglan.model;

public class User {

    private int id;
    private String name;
    private String address;
    private String email;
	
    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 String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

}

Now let us define our properties class which will be considered by spring-boot automatically to create the bean for datasource at run time. application.properties

spring.datasource.url=jdbc:mysql://localhost/devglan
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Now let us define our Dao class which will have implementation of namedparameterjdbctemplate to insert rows in the db.We are using KeyHolder to hold the auto generated primary key.

UserDaoIml
package com.devglan.dao.impl;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;
import org.springframework.stereotype.Repository;

import com.devglan.dao.UserDao;
import com.devglan.model.User;

@Repository
public class UserDaoImpl implements UserDao {

	private final String INSERT_SQL = "INSERT INTO USERS(name, address, email)  values(:name,:address,:email)";
	private final String FETCH_SQL = "select record_id, name, address, email from users";
	private final String FETCH_SQL_BY_ID = "select * from users where record_id = :id";

	@Autowired
	private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
	
	public User create(final User user) {
		KeyHolder holder = new GeneratedKeyHolder();
			SqlParameterSource parameters = new MapSqlParameterSource()
					.addValue("name", user.getName())
					.addValue("address", user.getAddress())
					.addValue("email", user.getEmail());
			namedParameterJdbcTemplate.update(INSERT_SQL, parameters, holder);
			user.setId(holder.getKey().intValue());
			return user;
		}
	
	public List findAll() {
		return namedParameterJdbcTemplate.query(FETCH_SQL, new UserMapper());
	}

	public User findUserById(int id) {
		Map parameters = new HashMap();
		parameters.put("id", id);
		return namedParameterJdbcTemplate.queryForObject(FETCH_SQL_BY_ID, parameters, new UserMapper());
	}

}

class UserMapper implements RowMapper {

	@Override
	public User mapRow(ResultSet rs, int rowNum) throws SQLException {
		User user = new User();
		user.setId(rs.getInt("record_id"));
		user.setName(rs.getString("name"));
		user.setEmail(rs.getString("address"));
		user.setEmail(rs.getString("email"));
		return user;
	}

}

Now, it is time to define our test cases to test whether the insert record in database with spring boot namedParameterJdbcTemplate.

UserDaoTest.java
package com.devglan.dao.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.devglan.config.Application;
import com.devglan.dao.UserDao;
import com.devglan.model.User;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(Application.class)
public class UserDaoTest {

	@Autowired
	private UserDao userDao;

	@Test
	public void createUser() {
		User savedUser = userDao.create(getUser());
		User userFromDb = userDao.findUserById(savedUser.getId());
		assertEquals(savedUser.getName(), userFromDb.getName());
		assertEquals(savedUser.getEmail(), userFromDb.getEmail());
	}

	@Test
	public void findAllUsers() {
		List users = userDao.findAll();
		assertNotNull(users);
		assertTrue(users.size() > 0);
	}

	@Test
	public void findUserById() {
		User user = userDao.findUserById(1);
		assertNotNull(user);
	}
	
	private User getUser() {
		User user = new User();
		user.setAddress("Bangalore, Karnataka");
		user.setEmail("johndoe@gmail.com");
		user.setName("John Doe");
		return user;
	}

}

SQL

CREATE TABLE users (record_id bigint NOT NULL AUTO_INCREMENT, name varchar(100), address varchar(250), email varchar(100), PRIMARY KEY (record_id));

Run Application

Run the test case defined as Junit test case and check the result.You can also verify that a single user row is created in db.

spring-boot-jdbc-test

Conclusion

I hope this article served you that you were looking for. If you have anything that you want to add or share then please share it below in the comment section.

Download the source

About The Author

author-image

Further Reading on Spring Jdbc

1. Insert Record In Db With Spring Boot Jdbctemplate

2. Insert Record In Db With Spring Boot Namedparameter Jdbctemplate

3. Fetch Auto Generated Primary Key Value After Insert Spring Jdbc

4. Working With Springboot Jdbctemplate

5. Execute Stored Procedure In Spring Jdbc

If You Appreciate What We Do Here On Devglan, You Should Consider: