[英]Map composite primary key to foreign key entities with Java Hibernate
[英]Hibernate map field of an Entity as a foreign key to multiple Entities
我想在“地址”实体中保存“用户”和“雇员”实体的地址。 如何设计我的地址实体,以便能够保存用户和雇员的地址。
扩展“用户”和“雇员”子类中的“人”类。
@MappedSuperclass\n 抽象类Person {\n @ManyToOne @JoinColumn(name =“ ADDRESS”)\n 受保护的地址地址;\n }\n\n @实体\n class Employee扩展Person {}\n\n @实体\n 类User扩展Person {}
您有两种选择,一种是使地址实体可嵌入,
@Embeddable
public class Address {
....
}
@Entity
public class User {
.....
@Embedded
private Address address;
}
@Entity
public class Employee {
.....
@Embedded
private Address address;
}
这将复制表Employee和表User中的列。
如果要共享地址,另一种方法是将地址用作表格:
@Entity
public class Address {
....
}
@Entity
public class User {
.....
@ManyToOne
private Address address;
}
@Entity
public class Employee {
.....
@ManyToOne
private Address address;
}
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