구현 기능
- 상품 등록
- 상품 목록 조회
- 상품 수정
package jpabook.jpashop.domain.item;
import jpabook.jpashop.domain.Category;
import jpabook.jpashop.exception.NotEnoughStockException;
import lombok.Getter;
import lombok.Setter;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "dtype")
@Getter @Setter
public abstract class Item {
@Id @GeneratedValue
@Column(name = "item_id")
private Long id;
private String name;
private int price;
private int stockQuantity;
@ManyToMany(mappedBy = "items")
private List<Category> categories = new ArrayList<Category>();
//==비지니스 로직==//
// stock 증가
public void addStock(int quantity){
this.stockQuantity += quantity;
}
public void removeStock(int quantity){
int restStock = this.stockQuantity - quantity;
if(restStock < 0){
throw new NotEnoughStockException("need more stock");
}
this.stockQuantity = restStock;
}
}
package jpabook.jpashop.exception;
public class NotEnoughStockException extends RuntimeException{
public NotEnoughStockException() {
super();
}
public NotEnoughStockException(String message) {
super(message);
}
public NotEnoughStockException(String message, Throwable cause) {
super(message, cause);
}
public NotEnoughStockException(Throwable cause) {
super(cause);
}
}
package jpabook.jpashop.repository;
import jpabook.jpashop.domain.item.Item;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Repository;
import javax.persistence.EntityManager;
import java.util.List;
@Repository
@RequiredArgsConstructor
public class ItemRepository {
private final EntityManager em;
public void save(Item item){
if(item.getId() == null){
em.persist(item);
}else {
em.merge(item);
}
}
public Item findOne(Long id){
return em.find(Item.class, id);
}
public List<Item> findAll(){
return em.createQuery("select i from Item i", Item.class)
.getResultList();
}
}
package jpabook.jpashop.service;
import jpabook.jpashop.domain.item.Item;
import jpabook.jpashop.repository.ItemRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service
@Transactional(readOnly = true)
@RequiredArgsConstructor
public class ItemService {
private final ItemRepository itemRepository;
@Transactional
public void saveItem(Item item){
itemRepository.save(item);
}
public List<Item> findItems(){
return itemRepository.findAll();
}
public Item findOne(Long itemId){
return itemRepository.findOne(itemId);
}
}
상품 서비스는 상품 리포지토리에 단순히 위임만 하는 클래스