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我对继承hibernate有几个问题(单表),
外键是否可以在抽象类上? - 如果其中一个孩子不使用它?
车辆是否应该受到保护?
请分享任何其他想法!
谢谢!Hibernate注解 - 吸入说明
下面是一个例子:“能外键是在抽象类”
@Entity
@Table(name = "vehicles")
@DiscriminatorColumn(name="type")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
public abstract class Vehicle {
@Id
@Column(name = "plate" ,nullable = false)
private String plate;
@OneToMany(cascade=CascadeType.ALL)
private List<EmissionInspection> insepections = new ArrayList<EmissionInspection>();
public List<EmissionInspection> getInsepections() {
return insepections;
}
...
}
@Entity
@DiscriminatorValue("POST_OFFICE_TRUCK")
@Table(name = "truck")
public class PSTruck extends Vehicle {
}
@Entity
@DiscriminatorValue("TRUCK")
@Table(name = "truck")
public class Truck extends Vehicle {
private insuranceDate;
}
@Entity
@DiscriminatorValue("PRIVATE_CAR")
@Table(name = "truck")
public class PrivateCar extends Vehicle {
private insuranceDate;
}
谢谢.......! – user648026 2012-03-16 01:34:48