For More information watch below video
Directory Structure
add below dependencies
Spring web, datajpa, lombok , h2
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-parent</artifactId>
<version>3.1.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>SpringBoot3H2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SpringBoot3H2</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-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</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>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
Product
package com.example.demo.entity;
import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.Id;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
public class Product {
@Id
@GeneratedValue
private Integer prodId;
private String prodName;
private double prodCost;
public Product(String prodName, double prodCost) {
super();
this.prodName = prodName;
this.prodCost = prodCost;
}
}
ProductRepository
package com.example.demo.repo;
import org.springframework.data.jpa.repository.JpaRepository;
import com.example.demo.entity.Product;
public interface ProductRepository extends JpaRepository<Product, Integer>{
}
TestRunner
package com.example.demo.runner;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
import com.example.demo.entity.Product;
import com.example.demo.repo.ProductRepository;
@Component
public class TestRunner implements CommandLineRunner{
@Autowired
private ProductRepository repo;
@Override
public void run(String... args) throws Exception {
Product p1 = new Product("P1",5600.4);
Product p2 = new Product("P2",6600.4);
Product p3 = new Product("P3",7600.4);
//save product
repo.save(p1);
repo.save(p2);
repo.save(p3);
//find
Optional<Product> opt = repo.findById(1);
if(opt.isPresent()) {
System.out.println(opt.get());
}else {
System.out.println("Not FOund");
}
//find all
repo.findAll().forEach(System.out::println);
//delete by id
repo.deleteById(1);
//delete all
repo.deleteAll();
}
}
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