Hibernate 一對多關系 - 子表未更新

Question

在這里，我向特定用戶添加新訂單列表。 在向特定用戶添加訂單時，它返回成功狀態，但我的數據庫仍然是空的。 為什么沒有添加數據...？

用戶

@Entity
Class Users{

@Id
private int id;

@OneToMany(fetch = FetchType.LAZY, mappedBy = "user")
private List<Orders> orders;

}

訂單

@Entity
Class Orders{

 @Id
 private int id;

 private Date orderDate;

 @ManyToOne(fetch = FetchType.LAZY)
 @JoinColumn(name = "user_id")
 private User user;
}

存儲庫

public ResponseEntity<String> addOrder(int userId,List<Orders> orders) throws UserNotFound{
        User user =userRepository.findById(userId).orElse(null);
        if(user==null) throw new UserNotFound("User Not Found");
        for(Orders o:orders){
            o.setOrderDate(new Date("....."));
        }
        user.getOrders().addAll(orders);
       userRepository.save(user);

}

Answer 1

嘗試將級聯持久添加到您的關系規范中：

@Entity
Class Users{

@Id
private int id;

@OneToMany(fetch = FetchType.LAZY, mappedBy = "user", cascade={CascadeType.PERSIST})
private List<Orders> orders;

}