Spring Data JDBC, PostgreSQL, CRUD Example

 Hello everyone, In this article, we will learn how to develop a  REST-style web service with Spring Boot, Spring Data JDBC, and PostgreSQL Database.GitHub repository link is provided at the end of this tutorial. You can download the source code.

What's new in this example? 
  • From Java 14 onwards, the record is a special type of class declaration aimed at reducing the boilerplate code. For more info click here
  • From Java 10 onwards, the var keyword allows local variable type inference, which means the type for the local variable will be inferred by the compiler, so we don't need to declare that. For more info click here

Technologies used : 

  • Spring Boot 2.6.3
  • Spring  Data JDBC 
  • Java 17 
  • PostgreSQL
  • Maven 3+ 

These are APIs that Spring backend App will export: 

  1. GET all User's        :     /api/v1/users             : get 
  2. GET User by ID     :     /api/v1/users/{id}       : get
  3. CREATE User        :     /api/v1/users             : post
  4. UPDATE User        :     /api/v1/users/{id}       : put
  5. DELETE User        :     /api/v1/users/{id}       : delete 

Final Project Directory:



Maven[pom.xml] 

A Project Object Model or POM is the fundamental unit of work in Maven. It is an XML file that contains information about the project and configuration details utilized by Maven to build the project. It contains default values for most projects. Some of the configurations that can be designated in the POM is the project dependencies, the plugins or goals that can be executed, the build profiles, and so on. Other information such as the project version, description, developers, mailing lists and such can withal be designated.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.3</version>
<relativePath />
</parent>
<groupId>com.knf.dev.demo</groupId>
<artifactId>spring-boot-data-jdbc-postgresql-crud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot-data-jdbc-postgresql-crud</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>
spring-boot-starter-data-jdbc
</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</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>

</project>


shema.sql: Creating a table for 'users'

Spring Boot can automatically create the schema (DDL scripts) of your DataSource and initialize it (DML scripts). It loads SQL from the standard root classpath locations: schema. sql and data. sql , respectively.
--
-- Create table for `users`
--

CREATE TABLE users (
id serial PRIMARY KEY,
first_name VARCHAR ( 50 ) NOT NULL,
last_name VARCHAR ( 50 ) NOT NULL,
email VARCHAR ( 255 ) NOT NULL
);


application.properties

spring.datasource.url= jdbc:postgresql://localhost:5432/postgres
spring.datasource.username= postgres
spring.datasource.password= password

spring.datasource.initialization-mode=always


Creating the Model User

package com.knf.dev.demo.springbootdatajdbccrud.model;

public record User
(Long id,
String firstName,
String lastName,
String email) {
}


Creating the User Repository

package com.knf.dev.demo.springbootdatajdbccrud.repository;

import java.util.List;

import com.knf.dev.demo.springbootdatajdbccrud.model.User;

public interface UserRepository {

public User findOne(Long id);

public List<User> findAll();

public void save(User user);

public Long saveAndReturnId(User user);

public void update(User user);

public Boolean delete(Long id);

}


Creating the User Repository Implementation

package com.knf.dev.demo.springbootdatajdbccrud.repository;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.stereotype.Repository;

import com.knf.dev.demo.
springbootdatajdbccrud.exception.InternalServerError;
import com.knf.dev.demo.
springbootdatajdbccrud.exception.UserNotFound;
import com.knf.dev.demo.
springbootdatajdbccrud.model.User;

@Repository
public class UserRepositoryImpl implements UserRepository {

private final JdbcTemplate jdbcTemplate;

@Autowired
public UserRepositoryImpl(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}

@Override
public User findOne(Long id) {
var sqlQuery = Query.FIND_ONE;

try {

return jdbcTemplate.
queryForObject(sqlQuery,
this::mapRowToUser, id);
} catch (EmptyResultDataAccessException ex) {
throw new UserNotFound("Invalid User Id");
} catch (Exception e) {
throw new InternalServerError
("Internal Server Error");
}

}

@Override
public List<User> findAll() {

var sqlQuery = Query.FIND_ALL;

return jdbcTemplate.
query(sqlQuery, this::mapRowToUser);
}

@Override
public void save(User user) {

var sqlQuery = Query.SAVE;

jdbcTemplate.update(sqlQuery,
user.firstName(),
user.lastName(),
user.email());
}

@Override
public Long saveAndReturnId(User user) {

var sqlQuery = Query.SAVE_AND_RETURN_ID;

var keyHolder = new GeneratedKeyHolder();

jdbcTemplate.update(connection -> {
PreparedStatement stmt = connection.
prepareStatement(sqlQuery,
new String[] { "id" });
stmt.setString(1, user.firstName());
stmt.setString(2, user.lastName());
stmt.setString(3, user.email());
return stmt;
}, keyHolder);

return keyHolder.getKey().longValue();
}

@Override
public void update(User user) {

var sqlQuery = Query.UPDATE;

jdbcTemplate.update(sqlQuery,
user.firstName(),
user.lastName(),
user.email(),
user.id());
}

@Override
public Boolean delete(Long id) {

var sqlQuery = Query.DELETE;

return jdbcTemplate.update(sqlQuery, id) > 0;
}

private User mapRowToUser(ResultSet resultSet, int rowNum)
throws SQLException {

var user = new User(resultSet.getLong("id"),
resultSet.getString("first_name"),
resultSet.getString("last_name"),
resultSet.getString("email"));

return user;
}

}


Query.java

package com.knf.dev.demo.springbootdatajdbccrud.repository;

public class Query {

public static final String FIND_ONE =
"select id, first_name, last_name,"
+ " email from users where id = ?";
public static final String FIND_ALL =
"select id, first_name,last_name,"
+ " email from users";
public static final String SAVE =
"insert into users(first_name, "
+ "last_name, email) "
+ "values (?, ?, ?)";
public static final String SAVE_AND_RETURN_ID =
"insert into users"
+ "(first_name, last_name, email) "
+ "values (?, ?, ?)";
public static final String UPDATE =
"update users set "
+ "first_name = ?, last_name = ?,"
+ " email = ? " + "where id = ?";
public static final String DELETE =
"delete from users where id = ?";
}


Exception Handler with Controller Advice in Spring

Spring supports exception handling by a global Exception Handler (@ExceptionHandler) with Controller Advice (@ControllerAdvice). This enables a mechanism that makes ResponseEntity work with the type safety and flexibility of @ExceptionHandler:
package com.knf.dev.demo.springbootdatajdbccrud.exception;

import java.util.Date;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.context.request.WebRequest;

@ControllerAdvice
public class GlobalExceptionHandler {

@ExceptionHandler(InternalServerError.class)
public ResponseEntity<ErrorMessage>
internalServerError(Exception ex, WebRequest request) {
var errors =
new ErrorMessage(500, new Date(),
ex.getMessage(), "Internal Server Error");

return new ResponseEntity<>
(errors, HttpStatus.INTERNAL_SERVER_ERROR);
}

@ExceptionHandler(UserNotFound.class)
public ResponseEntity<ErrorMessage>
userNotFound(Exception ex, WebRequest request) {
var errors =
new ErrorMessage(404, new Date(),
ex.getMessage(), "User Not Found");

return new ResponseEntity<>
(errors, HttpStatus.NOT_FOUND);
}
}


Custom Exception - Internal Server Error

package com.knf.dev.demo.springbootdatajdbccrud.exception;

public class InternalServerError extends RuntimeException {

private static final long serialVersionUID = 1L;

public InternalServerError(String msg) {
super(msg);
}
}


Custom Exception - UserNotFound

package com.knf.dev.demo.springbootdatajdbccrud.exception;

public class UserNotFound extends RuntimeException {
private static final long serialVersionUID = 1L;

public UserNotFound(String msg) {
super(msg);
}
}


Error Message

package com.knf.dev.demo.springbootdatajdbccrud.exception;

import java.util.Date;

public record ErrorMessage
(Integer statusCode,
Date timestamp,
String message,
String description) {
}



User Rest Controller

The @RestController annotation was introduced in Spring 4.0 to simplify the engendering of RESTful web services. It's a convenience annotation that combines @Controller and @ResponseBody. @RequestMapping annotation maps HTTP requests to handler methods of MVC and REST controllers.

package com.knf.dev.demo.springbootdatajdbccrud.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.knf.dev.demo.
springbootdatajdbccrud.exception.InternalServerError;
import com.knf.dev.demo.
springbootdatajdbccrud.model.User;
import com.knf.dev.demo.springbootdatajdbccrud.
repository.UserRepository;

@RestController
@RequestMapping("/api/v1/users")
public class UserController {

@Autowired
UserRepository userRepository;

//Create user
@PostMapping
public ResponseEntity<String> save(@RequestBody User usr) {

try {
var userId = userRepository.saveAndReturnId(usr);

return new ResponseEntity<String>
("User successfully created , Id ="
+ userId, HttpStatus.CREATED);
} catch (Exception e) {
throw new InternalServerError(e.getMessage());
}
}

//Get all users
@GetMapping
public ResponseEntity<List<User>> getAll() {

try {
return new ResponseEntity<List<User>>
(userRepository.findAll(), HttpStatus.OK);
} catch (Exception e) {
throw new InternalServerError(e.getMessage());
}
}

//Get user by id
@GetMapping("/{id}")
public ResponseEntity<User> getById
(@PathVariable("id") Long id) {

return new ResponseEntity<>
(userRepository.findOne(id), HttpStatus.OK);

}

// Delete user
@DeleteMapping("/{id}")
public ResponseEntity<String> deleteUser
(@PathVariable("id") Long id) {

userRepository.delete(userRepository.findOne(id).id());

return new ResponseEntity<>
("User removed successfully", HttpStatus.OK);

}

// Update user
@PutMapping("/{id}")
public ResponseEntity<String> updateUser
(@PathVariable("id") Long id, @RequestBody User user) {

var _user = userRepository.findOne(id);
var _upUSer = new User(_user.id(),
user.firstName(),user.lastName(),user.email());
userRepository.update(_upUSer);
return new ResponseEntity<>
("Updated successfully", HttpStatus.OK);

}
}



Spring Boot main driver

package com.knf.dev.demo.springbootdatajdbccrud;

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

@SpringBootApplication
public class SpringBootDataJdbcCrudApplication {

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

}


Local setup 

Github repository download link is provided at the end of this tutorial 

Step 1: Download or clone the source code to a local machine. 
Step 2: mvn clean install
Step 3: Run the Spring Boot application mvn spring-boot:run

Testing API's using Postman

Create user:


Update user:


Get all users:


Get user by id:


Delete a user by id:

Popular posts from this blog

Learn Java 8 streams with an example - print odd/even numbers from Array and List

Example 1: Java 8 program to print odd numbers from a List   import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; /*Java 8 Program to find Odd Numbers from a List*/ public class DriverClass { public static void main( String [] args) { List < Integer > numbers = Arrays. asList( 1 , 4 , 8 , 40 , 11 , 22 , 33 , 99 ); List < Integer > oddNumbers = numbers.stream(). filter(o -> o % 2 != 0 ). collect(Collectors.toList()); System.out.println(oddNumbers); } } 1. Initialize List using Arrays.asList() method. Java's built-in Arrays.asList() method converts an array into a list. This method takes an array as an argument and returns a List object. 2.  Java List interface provides stream() method which returns a sequential Stream with list of Integer as its source. 3. The Java stream filter() method allow
Read more

Java Stream API - How to convert List of objects to another List of objects using Java streams?

Image
In this section, we will show you how to convert a List of objects to another List of objects in Java using the Java streams map(). The ‘map’ method maps each element to its corresponding result. Java Stream API   The Java Stream API provides a functional programming approach over the object oriented capabilities of Java. It is used for processing collections of objects. The Stream in Java can be defined as a sequence of elements from a source List, Set or Array. Most of the stream operations return a Stream. This avails engender a chain of stream operations(stream pipe-lining). The streams withal support the aggregate or terminal operations on the elements. for example, finding the sum or maximum element or finding the average etc...Stream operations can either be executed sequentially or parallel. when performed parallelly, it is called a parallel stream.   Stream map() Method   The Java 8 Stream map() is an intermediate operation. It converts Stream<obj1> to Stream<obj2>
Read more

Registration and Login with Spring Boot + Spring Security + Thymeleaf

Image
In this section, we will learn how to create user registration and login using Spring boot, Spring security, Thymeleaf, JPA, and H2DB. The GitHub repository link is provided at the end of this tutorial. You can download the source code. Technologies used: Spring Boot 2.5.5  Spring Data JPA  Spring Security  Thymeleaf  Maven 3+  Java 17  H2 Database   User Interface User Registration Authentication Failed Authentication success Sign out Final Project Structure: Complete pom.xml: <? xml version ="1.0" encoding ="UTF-8" ?> < project xmlns ="http://maven.apache.org/POM/4.0.0" xmlns: xsi ="http://www.w3.org/2001/XMLSchema-instance" xsi :schemaLocation ="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion >4.0.0</ modelVersion > < parent > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-pare
Read more

Java, Spring Boot Mini Project - Library Management System - Download

Image
Hello everyone, Hope you are doing well. Here, we provide a Library Management System mini-project for beginners, it's free for download. Maybe you can build more on top of this project and create your own product, that's all about you. The source code download link is provided at the end of this post. 1. Benefit of this project You could cover the following technologies and features by learning and debugging this mini project. Java 17 Java Stream Java Lamda Expressions Java Records Functional programming Object-oriented programming var Keyword in Java Generics in Java Java Switch Spring boot 2.6.4 Spring Security Thymeleaf template engine OpenCSV Spring Data JPA Server Side Pagination H2 Database  Bootstrap HTML CSS and more... 2. Objective Of Spring Boot On Library Management System The main objective of this project is to manage the details of the books, author, category, and publisher. Only Admin/Librarian will manage all these activities. Also, they can export the data in
Read more

ReactJS, Spring Boot JWT Authentication Example

Image
In this tutorial, we’ll create a user registration & login example using ReactJS, Spring Boot, Spring Security, and JWT authentication. You could download the source code from our Github repository, the download link is provided at the end of this tutorial. Technologies used Backend Technologies: Java 17 Spring Boot 2.7.0 Spring Security Spring Data JPA JWT H2 Database Frontend Technologies: React 17.0.1 Axios 0.27.2 Redux 4.0.5 Bootstrap 4.5.2 ReactJS - SpringBoot - JWT - Flow Backend Project Directory: Frontend Project Directory: Following is the screenshot of our application - User Registration: User Signin: Profile View: Access Resource: We will build two projects:  1. Backend:   spring-boot-security-jwt 2. Frontend: react-redux-jwt Project 1: spring-boot-security-jwt Pom.xml <?xml version = "1.0" encoding = "UTF-8" ?> <project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
Read more

Spring Boot + Mockito simple application with 100% code coverage

Image
In this article, we will show you a simple  Spring Boot example to demonstrate test methods for Controllers, Service, and Repository, And code coverage analysis using the EclEmma plugin. Technologies used: Spring Boot 2.6.4 Mockito 3.11.2 Maven 3+ EclEmma plugin Junit 5 Java 17 A quick overview of  Spring Boot, Mockito, and EclEmma plugin Spring boot: Spring boot to develop REST web services and microservices. Spring Boot has taken the Spring framework to the next level. It has drastically reduced the configuration and setup time required for spring projects. We can set up a project with almost zero configuration and start building the things that actually matter to your application. Mockito: Mockito is a mocking framework, a JAVA-predicated library that is utilized for efficacious unit testing of JAVA applications. Mockito is utilized to mock interfaces so that a dummy functionality can be integrated into a mock interface that can be utilized in unit testing. EclEmma : E
Read more

Top 5 Java ORM tools - 2024

Image
  The term ORM refers to object-relational mapping, which uses objects to adapt programming languages to database systems while allowing them to function with SQL and object-oriented programming ideas. Any kind of database management system that can accomplish object mapping to the table in the virtual system is suitable for the implementation of ORM. Java has a wide variety of ORM tools, some of which are mentioned below: 1. Hibernate Hibernate is a lightweight, open-source, non-invasive Java ORM (Object-Relational Mapping) framework that allows developers to create objects that function independently of database software and create persistence logic in any Java or JavaEE application. It offers an abstraction layer, so developers don't have to bother about implementations; Hibernate handles these tasks internally, such as connecting to databases and creating queries to carry out CRUD operations, among other things. Persistence logic development is done with it. Persistence logic r
Read more

Java - Blowfish Encryption and decryption Example

Image
Blowfish is an encryption method developed by Bruce Schneier in 1993 as an alternative to the DES encryption method. It is significantly faster than DES and provides good encryption speed, although no effective cryptanalysis technique has been found to date. It is one of the first secure block ciphers that is not protected by any patents and is therefore freely available for anyone to use. This is a symmetric block cipher algorithm. Block size: 64 bits Key size: variable size from 32 to 448 bits number of subsections: 18 [P-array] number of rounds: 16 number of substitution blocks: 4 [each with 512 records of 32 bits each] develop  Example 1: Encryption and decryption using Blowfish import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.util.Base64; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeExc
Read more

Spring boot video streaming example-HTML5

Image
Hello everyone, Today we will learn how to stream MP4 video using Spring Boot and Spring Web Flux.  The Source code download link is provided at the end of this post. New, Quarkus Practice User Interface   Project Structure: G radle(build.gradle) plugins { id 'org.springframework.boot' version '2.5.4' id 'io.spring.dependency-management' version '1.0.11.RELEASE' id 'java' } group = 'com.knf.demo' version = '0.0.1-SNAPSHOT' sourceCompatibility = '11' repositories { mavenCentral() } dependencies { implementation 'org.springframework.boot:spring-boot-starter-webflux' testImplementation 'org.springframework.boot:spring-boot-starter-test' testImplementation 'io.projectreactor:reactor-test' } test { useJUnitPlatform() } Service (VideoStreamingService.java) package  com.knf.demo.service ; import org.springframework.beans.factory.annotation. Autowired ; import org.springframew
Read more

Google Cloud Storage + Spring Boot - File Upload, Download, and Delete

Image
In this section, we will learn  how to  create a simple spring boot application to perform different file operations such as upload, download, list, and delete files from the Google Cloud Storage. 1.  A little bit of Background Google Cloud Storage Cloud Storage is a managed service for storing unstructured data. Store any amount of data and retrieve it as often as you like. More Info - click here! Spring Boot Spring Boot makes it easy to create stand-alone, production-grade Spring-based Applications that you can "just run".  More Info - click here! 2. Create a GCP Project First, Sign into the Google console at  https://console.cloud.google.com . You can create a new project by first selecting the project dropdown in the top left and selecting " New Project ". Next, specify your GCP  Project name  and  Project ID . Then  Click on the " CREATE " button. Copy " Project ID " and keep it for future purposes. 3. Create a Google Cloud Storage bucket Fr
Read more