扩展JPA中的实体类引发“field list”错误中的未知列“dtype”

Question

@Entity
@Table(name = "PERSON")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)  
public class Person {    
    @Id
    @GeneratedValue
    @Column(name = "PERSON_ID")
    private Long personId;

    @Column(name = "FIRSTNAME")
    private String firstname;

    @Column(name = "LASTNAME")
    private String lastname;

    // Constructors and Getter/Setter methods, 
}

Employee类扩展Person

@Entity    
public class Employee extends Person {

    @Transient
    private Date joiningDate;   


    // Copy Constructors and Getter/Setter methods, 
}

Employee类只有一个瞬态对象，所以我不确定是否使用@DiscriminatorColumn和@DiscriminatorValue，因为我尝试不使用抛出错误的Discriminator

session.save(employee);

Answer 1

您应该使用@DiscriminatorColumn和@DiscriminatorValue。你可以在这里找到一个很好的例子。