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Added CRUD operations using Spring Data JPA with Spring Boot framework #1

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175 changes: 122 additions & 53 deletions src/main/java/com/example/springbootjpacrudexample/SpringbootApplication.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
package com.example.springbootjpacrudexample;

import java.math.BigDecimal;
import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
Expand All @@ -12,61 +14,128 @@
@SpringBootApplication
public class SpringbootApplication implements CommandLineRunner {

@Autowired
ProductRepository productRepository;

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

@Override
public void run(String... arg0) throws Exception {

System.out.println("\n----------------------------------------------------------------");
System.out.println("Sring boot examples by Deepak");
System.out.println(" . ____ _ __ _ _\n" +
" /\\\\ / ___'_ __ _ _(_)_ __ __ _ \\ \\ \\ \\\n" +
"( ( )\\___ | '_ | '_| | '_ \\/ _` | \\ \\ \\ \\\n" +
" \\\\/ ___)| |_)| | | | | || (_| | ) ) ) )\n" +
" ' |____| .__|_| |_|_| |_\\__, | / / / /\n" +
" =========|_|==============|___/=/_/_/_/");
System.out.println("\nSpring Boot JPA CRUD Examples");
System.out.println("----------------------------------------------------------------\n");
@Autowired
ProductRepository productRepository;

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

/**
* Retrieves all the records in a given table.
*/
private void findAll() {
Iterable<Product> products = productRepository.findAll();

System.out.println("\n***** Let's find all the records from the database table *****\n");
for(Product product: products) {
System.out.println("Product Id : " + product.getId());
System.out.println("Product Name : " + product.getName());
System.out.println("Product Price : " + product.getPrice());
System.out.println("Product Quantity : " + product.getQuantity());
System.out.println("====================================================");
}
}
@Override
public void run(String... arg0) throws Exception {

/**
* Retrieves one record against a particular id.
*/
private void findByPrimaryKey() {
Optional<Product> product = productRepository.findById(1);
if (product.isPresent()) {
Product retrievedProduct = product.get();
System.out.println("\n***** Let's find a records by its id from the database table *****\n");
System.out.println("Product Id : " + retrievedProduct.getId());
System.out.println("Product Name : " + retrievedProduct.getName());
System.out.println("Product Price : " + retrievedProduct.getPrice());
System.out.println("Product Quantity : " + retrievedProduct.getQuantity());
System.out.println("====================================================");
}
System.out.println("\n----------------------------------------------------------------");
System.out.println("Sring boot examples by Deepak");
System.out.println(" . ____ _ __ _ _\n" +
" /\\\\ / ___'_ __ _ _(_)_ __ __ _ \\ \\ \\ \\\n" +
"( ( )\\___ | '_ | '_| | '_ \\/ _` | \\ \\ \\ \\\n" +
" \\\\/ ___)| |_)| | | | | || (_| | ) ) ) )\n" +
" ' |____| .__|_| |_|_| |_\\__, | / / / /\n" +
" =========|_|==============|___/=/_/_/_/");
System.out.println("\nSpring Boot JPA CRUD Examples");
System.out.println("----------------------------------------------------------------\n");

}
// ---- CRUD Operations ----
findAll(); // Retrieve (R)
findByPrimaryKey(); // Retrieve (R)
findUsingCustomeQuery(); // Retrieve (R)
createEntity(); // Create (C)
updateEntity(); // Update (U)
deleteEntity(); // Delete (D)
}

/**
* Retrieves all the records in a given table.
*/
private void findAll() {
Iterable<Product> products = productRepository.findAll();

System.out.println("\n***** Let's find all the records from the database table *****\n");
for (Product product : products) {
System.out.println("Product Id : " + product.getId());
System.out.println("Product Name : " + product.getName());
System.out.println("Product Price : " + product.getPrice());
System.out.println("Product Quantity : " + product.getQuantity());
System.out.println("====================================================");
}
}

/**
* Retrieves one record against a particular id.
*/
private void findByPrimaryKey() {
Optional<Product> product = productRepository.findById(1);
if (product.isPresent()) {
Product retrievedProduct = product.get();
System.out.println("\n***** Let's find a records by its id from the database table *****\n");
System.out.println("Product Id : " + retrievedProduct.getId());
System.out.println("Product Name : " + retrievedProduct.getName());
System.out.println("Product Price : " + retrievedProduct.getPrice());
System.out.println("Product Quantity : " + retrievedProduct.getQuantity());
System.out.println("====================================================");
}
}

/**
* Custom query example
*/
private void findUsingCustomeQuery() {
List<Product> products = productRepository.search("bi");
for(Product product: products) {
System.out.println("\n***** Let's find a records which has 'bi' in their names *****\n");
System.out.println("Product Id : " + product.getId());
System.out.println("Product Name : " + product.getName());
System.out.println("Product Price : " + product.getPrice());
System.out.println("Product Quantity : " + product.getQuantity());
System.out.println("====================================================");
}
}

/**
* Creates a new record in the database table using Spring Data JPA in Spring
* Boot.
*/
private void createEntity() {
System.out.println("\n***** Let's create a new record *****\n");
Product newProduct = new Product();
newProduct.setName("Mobile 2");
newProduct.setPrice(new BigDecimal(2000));
newProduct.setQuantity(4);
newProduct = productRepository.save(newProduct);
System.out.println("New product's id : " + newProduct.getId());
System.out.println("====================================================");
}

/**
* Updates a record in the database table using Spring Data JPA in Spring Boot.
*/
private void updateEntity() {
System.out.println("\n***** Let's update a record *****\n");
Optional<Product> product = productRepository.findById(3);
if (product.isPresent()) {
Product productToBeUpdated = product.get();
productToBeUpdated.setQuantity(productToBeUpdated.getQuantity() + 1);
productToBeUpdated = productRepository.save(productToBeUpdated);
System.out.println("Product Id : " + productToBeUpdated.getId());
System.out.println("Product Name : " + productToBeUpdated.getName());
System.out.println("Product Price : " + productToBeUpdated.getPrice());
System.out.println("Product Quantity : " + productToBeUpdated.getQuantity());
System.out.println("====================================================");
}
}

/**
* Deletes a record.
*/
private void deleteEntity() {
System.out.println("\n***** Let's delete a record *****");
productRepository.deleteById(2);
Optional<Product> product = productRepository.findById(3);
if (product.isPresent()) {
System.out.println("Record has not been deleted.");
} else {
System.out.println("Record has been deleted successfully.");
}
System.out.println("====================================================");
}
}
14 changes: 13 additions & 1 deletion src/main/java/com/example/springbootjpacrudexample/repositories/ProductRepository.java
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Original file line number Diff line number Diff line change
@@ -1,10 +1,22 @@
package com.example.springbootjpacrudexample.repositories;

import java.util.List;

import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import com.example.springbootjpacrudexample.entities.Product;

@Repository
@Repository("productRepository")
public interface ProductRepository extends CrudRepository<Product, Integer> {

/**
* Custom query method.
*
* @param keyword
* @return
*/
@Query("from Product where name like %:keyword%")
public List<Product> search(@Param("keyword") String keyword);
}