你好，我希望你能帮助我，我有一个在冬眠插入问题。首先我有个人课

@Entity
@Table(name = "persons")
@Inheritance(strategy = InheritanceType.JOINED)
public class Person implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "id_card", columnDefinition = "VARCHAR(13)")
    private String idCard;

    @Column(name = "name", columnDefinition = "VARCHAR(50) NOT NULL")
    private String name;

    @Column(name = "last_name", columnDefinition = "VARCHAR(50) NOT NULL")
    private String lastName;
}

我有两个班外加一个提供者。

@Entity
@Table(name = "providers")
public class Provider extends Person implements Serializable {

    private static final long serialVersionUID = 1L;

    public Provider() {
        // TODO Auto-generated constructor stub
    }
}

顾客

@Entity
@Table(name = "customers")
public class Customer extends Person implements Serializable {

    private static final long serialVersionUID = 1L;

    public Customer() {
        // TODO Auto-generated constructor stub
    }
}

结果是，我插入了一个提供者，没有问题，就像插入一个客户时没有问题一样，结果是，当我已经插入一个人作为客户时，我不能再插入他们作为供应商，我得到了密钥。
事实上，一个人可以同时成为客户、供应商或员工。
er图