Spring Data jpa-hibernate-OneTomany,ManytoOne双向

Question

拥有2个实体：订单和产品。1个订单可以有多个产品，多个产品可以属于1个订单（每个产品只属于1个订单）。

@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "order_details")
public class OrderData {

    @Id
    @Column(name = "order_id", nullable = false, unique = true)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long orderId;

    @NotNull
    @Column(name = "customer_name", nullable = false)
    private String customerName;

    @OneToMany(mappedBy = "productId", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    private Set<ProductData> products;

}

@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "product_details")
public class ProductData {

    @Id
    @Column(name = "product_id", nullable = false, unique = true)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long productId;

    @NotNull
    @Column(name = "product_name", nullable = false)
    private String productName;

    @ManyToOne(fetch = FetchType.LAZY, optional = false, cascade = CascadeType.ALL)
    @JoinColumn(name = "order_id", nullable = false)
    private OrderData orderData;
}

尝试了@JsonIgnore。这不会返回子元素或父元素。尝试了@JsonManagedReference和@JsonBackReference-仍然没有成功。

请给我指点一下

Answer 1

mappedBy属性指向错误的字段：

@OneToMany(mappedBy = "productId", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
private Set<ProductData> products;

这必须是后面的引用：

@OneToMany(mappedBy = "orderData", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
private Set<ProductData> products;