Jpa @OneToMany

案例

@Entity
@Table(name = "robot")
public class RobotEntity {


    @OneToMany//(orphanRemoval=true)
    @JoinColumn(name = "robot_id")
    private List<Material> robotSoftware = new ArrayList<Material>();

}

1. List如果不指定Material则需要 @OneToMany(targetEntity=xxx.class)

2. 使用 cascade=CascadeType.ALL需要在Material里同时使用@ManyToOne