Spring Boot : REST + JPA CRUD 구현

1. 이 포스트는 Spring Boot : REST + Hibernate CRUD 구현의 연속이다.

Spring Boot : REST + Hibernate CRUD 구현

 

2. 위 포스트 내용과 다른 부분은 CustomerDAO 인터페이스의 구현 뿐이다.

  2-1 Hibernate의 get -> find

  2-2 Hibernate의 save -> persist

  2-3 Hibernate의 saveOrUpdate -> merge

  2-4 Hibernate의 delete -> remove

  2-5 Hibernate의 createQuery -> createQuery

package pe.pilseong.bootcustomer.dao;

import java.util.List;

import javax.persistence.EntityManager;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import pe.pilseong.bootcustomer.entity.Customer;

@Repository
public class CustomerJPADAOImpl implements CustomerDAO {

  @Autowired
  private EntityManager entityManager;
  
  @Override
  public List<Customer> getCustomers() {
    return entityManager.createQuery("from Customer", Customer.class).getResultList();
  }

  @Override
  public Customer getCustomer(Long id) {
    Customer customer = entityManager.find(Customer.class, id);
    if (customer == null) {
      throw new RuntimeException("not found");
    }
    
    return customer;
  }

  @Override
  public void saveCustomer(Customer customer) {
    Customer savedCustomer = entityManager.merge(customer);
    
    customer.setId(savedCustomer.getId());
  }

  @Override
  public void deleteCustomer(Customer customer) {
    entityManager.remove(customer);
  }

}