hibernate：非实体类的实体属性

hk8txs48 于 2021-07-08 发布在 Java

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所以我有一个hibernate实体叫做appointment，在这个实体中我有一个appointnumber属性，它本身包含一个数字属性，它是一个字符串。当我坚持预约时，我需要预约号码。前几天我让它与@embedded和@embeddeble一起工作，但是这会创建一个我无法拥有的连接表。我尝试了许多其他的解决方案，试图让它在没有连接表的情况下工作，但我想不通(我有很多ava.lang.illegalstate例外）有人能帮忙吗？谢谢！

@Entity(name = "appointments")
public class Appointment {
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;

    @OneToOne(mappedBy = "number")
    @Fetch(value = FetchMode.SELECT)
    private AppointmentNumber appointmentNumber;

任命实体
appointmentnumber，用于约会，但不应为实体

public class AppointmentNumber {

    @OneToOne
    @JoinColumn(name = "appointmentNumber", unique = true, nullable = false)
    private String number;

Java Hibernate h2

来源：https://stackoverflow.com/questions/64959726/hibernate-entity-property-from-non-entity-class

1条答案

按热度按时间

slmsl1lt1#

你可以这样做：

@Entity(name = "appointments")
public class Appointment {

  ///....
  @Convert(converter = AppointmentNumberConverter.class)
  private AppointmentNumber appointmentNumber;
  ///....
}

@Converter
public class AppointmentNumberConverter implements 
AttributeConverter<PersonName, String> {

  @Override
  public String convertToDatabaseColumn(AppointmentNumber appointmentNumber) {
    if (appointmentNumber == null) {
        return null;
    }

    return appointmentNumber.getNumber();
  }

  @Override
  public AppointmentNumber convertToEntityAttribute(String appointmentNumber) {
    if (appointmentNumber == null) {
        return null;
    }
    AppointmentNumber result = new AppointmentNumber();
    result.setNumber(appointmentNumber);
    return result;
  }
}

请看jpa转换器文档。

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hibernate：非实体类的实体属性

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