05 연관관계 매핑 시작 실전예제

1) 회원(Member) 엔티티 

@Entity
public class Member {

    @Id @GeneratedValue
    @Column(name = "MEMBER_ID")
    private Long id;

    private String name;

    private String city;
    private String street;
    private String zipcode;

    @OneToMany(mappedBy = "member")
    private List<Order> orders = new ArrayList<Order>();

    //Getter, Setter
}

2) 주문(Order) 엔티티

@Entity
@Table(name = "ORDERS")
public class Order {

    @Id @GeneratedValue
    @Column(name = "ORDER_ID")
    private Long id;

    @ManyToOne
    @JoinColumn(name = "MEMBER_ID")
    private Member member;      //주문 회원

    @OneToMany(mappedBy = "order")
    private List<OrderItem> orderItems = new ArrayList<OrderItem>();

    @Temporal(TemporalType.TIMESTAMP)
    private Date orderDate;     //주문시간

    @Enumerated(EnumType.STRING)
    private OrderStatus status;//주문상태

    //==연관관계 메서드==//
    public void setMember(Member member) {
        //기존 관계 제거
        if (this.member != null) {
            this.member.getOrders().remove(this);
        }
        this.member = member;
        member.getOrders().add(this);
    }

    public void addOrderItem(OrderItem orderItem) {
        orderItems.add(orderItem);
        orderItem.setOrder(this);
    }

    //Getter, Setter
}

@Entity
@Table(name = "ORDER_ITEM")
public class OrderItem {

    @Id @GeneratedValue
    @Column(name = "ORDER_ITEM_ID")
    private Long id;

    @ManyToOne
    @JoinColumn(name = "ITEM_ID")
    private Item item;      //주문 상품

    @ManyToOne
    @JoinColumn(name = "ORDER_ID")
    private Order order;    //주문

    private int orderPrice; //주문 가격
    private int count;      //주문 수량

    //Getter, Setter
}

@Entity
public class Item {

    @Id
    @GeneratedValue
    @Column(name = "ITEM_ID")
    private Long id;

    private String name;        //이름
    private int price;          //가격
    private int stockQuantity;  //재고수량

    //Getter, Setter
}