在hibernate中标注派生数据库列

@Entity
@Table(name = "employee")
public class Employee {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String firstName;
    private String lastName;

    @Formula("concat(first_name, ' ', last_name)")
    private String fullName;

    // 其他属性和方法
}

@Entity
@Table(name = "order")
public class Order {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String orderNumber;

    @Generated(GenerationTime.ALWAYS)
    @Column(name = "total_amount", insertable = false, updatable = false)
    private BigDecimal totalAmount;

    // 其他属性和方法
}