用jpa在對象中保留一個對象

Question

我有這個對象

@Entity
public class Cat {
  @Id String name;
  Fur fur;
}

public class Fur {
  String color1;
  String color2;
}

如何將其映射到：

 Name      Color1 Color2
+---------+------+------+
|SnowBall |red   |green |
+---------+------+------+
|Snowball2|white |black |
+---------+------+------+

我只有JPA 2.1

Answer 1

您可以使用@Embeddable和@Embedded JPA注釋。

@Entity
public class Cat {
  @Id String name;
  @Embedded
  Fur fur;
}

@Embeddable
public class Fur {
  String color1;
  String color2;
}