```java public class Country { //country 對應 Province.country 屬性名 @OneToMany(mappedBy = "country", fetch = FetchType.EAGER) private List<Province> provinceList; } ``` ```java public class Province { //Country -> Province 是一對多，反過來 Province -> Country 就是多對一 @ManyToOne(targetEntity = Country.class) //country_id 對應 Country.id 屬性名 //將會在 Province 表中建立 country_id 的物理外鍵 @JoinColumn(name = "country_id", referencedColumnName = "id") private Country country; } ``` >[warning] 如果你使用 lombok 請查看章節【注意事項】，了解一些細節。