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Question

我正在尝试使用 Hibernate 将实体产品映射到其他产品的自我引用。

创建项目发送的JSON是这样的：

{"name":"chair", "description":"red chair",
 "parent": {"name":"table","description":"red table"}
 }

当我收到这个 json 时，我需要将子产品保存在数据库中，并使用父属性中的 productId 设置 PARENT_PRODUCT_ID。

请帮忙？

public class Product implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@Column(name = "ID")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer productId;

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

@Column(name = "DESCRIPTION")
private String description;

@OneToMany(cascade=CascadeType.ALL)
@JoinColumn(name="PRODUCT_ID")
private List<Image> images;

@OneToMany(cascade=CascadeType.ALL)
@JoinColumn(name="PRODUCT_ID")
private List<Product> children;

@ManyToOne
@JoinColumn(name = "PARENT_PRODUCT_ID")
private Product parent;   

Image.java：

@Entity
@Table
public class Image implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@Column(name = "ID")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer imageId;

@Column(name = "TYPE")
private String type;

@ManyToOne
@JoinColumn(name = "PRODUCT_ID", nullable = false)
private Product product;

Answer 1

在oneToMany关系中，我认为应该是这样的：

@OneToMany(cascade=CascadeType.ALL, mappedBy="parent")
private List<Product> children;