如何將一個實體映射到兩個表？

Question

主鍵必須映射到兩個表； 第一張桌子是多對一，第二張是一對一； 我怎么做？ 我給你我的課

package salepoint.model;

/*i've deleted imports*/

@Entity
@Table (name = "sales")
@SecondaryTables({
    @SecondaryTable(name = "sold_products", pkJoinColumns = {
        @PrimaryKeyJoinColumn(name = "sales_id")})})
public class Sale implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @ManyToOne
    @JoinTable(name = "user_sales", joinColumns = @JoinColumn(name =                         "sale_id"))
private Integer id;

@Column (name = "amount")
private Double amount;

@Column (name = "date")
private Date date;

@Column (name = "user_id")
private Integer user_id;

public Sale() {
}

public Sale(Double amount, Date date, Integer user_id) {
    this.amount = amount;
    this.date = date;
    this.user_id = user_id;
}

public Sale(Integer id, Double amount, Date date, Integer user_id) {
    this.id = id;
    this.amount = amount;
    this.date = date;
    this.user_id = user_id;
}

@Override
public String toString() {
    return "Sale{"
            + "id = " + id
            +", amount = " + amount
            + ", date = " + date
            + ", user_id = " + user_id + '}';
}
/*i've deleted getters and setters, stack overflow didn't want me to put it*/
}

希望你能幫助我，伙計們； 我很絕望

Answer 1

請糾正我我在這里錯了，

您正在嘗試映射用戶及其銷售表。 那么你為什么需要在銷售表中創建多對一映射它應該在用戶 pojo 中

list<sale> sales;

上面的屬性應該是多對一的注釋。 在銷售 pojo 中，

User user;

用一對多注釋就可以了。

你看起來像這樣嗎？