D.Tech Academic: Spring Boot CRUD with JPA

Project Structure:

Post.java

package com.deepsingh44.demo.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "posts")
public class Post {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	private String title;
	private String description;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

}

PostDao.java

package com.deepsingh44.demo.dao;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.deepsingh44.demo.model.Post;

@Repository
public interface PostDao extends JpaRepository<Post, Integer> {

}

HelloController.java

package com.deepsingh44.demo.controller;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
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.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.deepsingh44.demo.dao.PostDao;
import com.deepsingh44.demo.model.Post;

@RestController
public class HelloController {

	@Autowired
	private PostDao postDao;

	@PostMapping("/addpost")
	public String hello(@RequestBody Post post) {
		postDao.save(post);
		return "Successfully Added";
	}

	@GetMapping("/posts")
	public List<Post> getAllPost() {
		return postDao.findAll();
	}

	@GetMapping("/find/{id}")
	public Post getPostById(@PathVariable int id) {
		Optional<Post> opt = postDao.findById(id);
		return (!opt.isEmpty()) ? opt.get() : new Post();
	}

	@DeleteMapping("/delete")
	public String deletePostById(@RequestParam int id) {
		String msg = "Not Deleted";
		Post post = getPostById(id);
		if (post.getId() != 0) {
			postDao.delete(post);
			msg = "Successfully Deleted";
		}
		return msg;
	}

	@PutMapping("/update")
	public Post updatePost(@RequestBody Post mypost) {
		Post post = getPostById(mypost.getId());
		return (post.getId() == 0) ? post : postDao.save(mypost);
	}

}

WeekendHelloWorldApplication.java

package com.deepsingh44.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class WeekendHelloWorldApplication {

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

}

application.properties

server.port=8081

spring.datasource.username=root
spring.datasource.password=root
spring.datasource.url=jdbc:mysql://localhost:3306/bootdb
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update

pom.xml

 <dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-web</artifactId>
	</dependency>
       
 <dependency>
    	<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<version>5.1.6</version>
	</dependency>

 <dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-data-jpa</artifactId>
	</dependency>