SQL 错误或缺少数据库/OneToMany SQLIt-Spring Boot

Question

我对 oneToMany 的关系有疑问。我在 SQLite DB 中创建了表，这是我的表：

我的类别模型：

@Entity
@Table(name = "Category")
@JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
public class CategoryModel {
    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;

    private String category_name;
    private String category_description;
    private String image_path;

    @JsonIgnore
    @OneToMany( mappedBy = "category")
    private Set<ProductModel> category;

我的产品类别：

@Entity
@Table(name = "Product_Category")
@JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
public class ProductModel {

    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long product_id;
    private Long category_id;

    private String name;
    private String description;
    private int numberOfProduct;
    private String image;
    private int price;

    @ManyToOne
    @JoinColumn(name = "country_id", nullable = false)
    private CategoryModel category;

我可以很好地从Category 表中获取数据，但是当我从 Product_Category 表中调用数据时出现错误：

SQL error or missing database (no such column: productmod0_.country_id)

Answer 1

country_id 在您的表中的任何位置都不存在。

你想要的是：@JoinColumn(name = "category_id", nullable = false)