양방향 매핑 예제

양방향 매핑 예제

User Class : Orders class = 1 : N 관계임

User Class

@Table(name = "ORDERS")
public class User {
    @Id
    @GeneratedValue(
            strategy = GenerationType.SEQUENCE,
            generator = "USER_SEQ_INDEX_GEN"
    )
    @Column(name = "USER_ID", unique = true)
    private Long id;

    @Column(unique = true)
    private String name;

    @OneToMany(mappedBy = "user", fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
    private List<Orders> orders = new ArrayList<>();

    public User changeName(String name){
        this.name = name;
        return this;
    }

    public void addOrders(Orders order){
        orders.add(order);
    }
}

 

Orders Class

@Table(name="USER")
public class Orders {
    @Id
    @GeneratedValue(
            strategy = GenerationType.SEQUENCE,
            generator = "ORDERS_SEQ_INDEX_GEN"
    )
    @Column(name = "ID", unique = true)
    private Long id;

    @Column(name = "NAME")
    private String name;

    @Column(name = "AMOUNT")
    private int amount;

    @CreationTimestamp
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss", timezone = "Asia/Seoul")
    @Column(name = "ORDER_DATE", updatable = false)
    private LocalDateTime dateTime;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "USER_ID")
    private User user;
}