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我在TomCat中使用JPA中的Spring Boot Data Rest來保存MySQL中的數據。Spring Boot Data Rest JPA:@ManyToOne沒有填充數據庫中的ForeignKey列
問題:當JSON添加用戶被髮送到REST端點,無論MySQL表被更新,但在映射列(phone.user_id)的值被設置爲「NULL」(應該設置爲相應的User.uid)... 代碼缺少什麼工作按預期工作?
所得SQL表和值:
// "user" table // "phone" table
uid | first_name pid | number | user_id
---------------- ------------------------
1 | John 1 | 03432453 | NULL <--- should show 1
2 | 02451254 | NULL <--- should show 1
的@OneToMany側:
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long uid;
private String firstName;
@OneToMany(cascade=CascadeType.ALL, mappedBy="user", orphanRemoval=true)
private List<Phone> phones;
/* getters and setters */
public void addPhone(Phone phone) {
this.phones.add(phone);
phone.setUser(this);
}
/* UPDATED - method added */
public User updatePhoneUserId(User user) {
List<Phone> phs = user.getPhones();
for (Phone ph : phs) {
ph.setUser(user);
}
return user;
}
}
的@ManyToOne側:
@Entity
public class Phone {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long pid;
private String number;
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name="user_id")
private User user;
/* getters and setters*/
}
的UserRepository和PhoneRepository:
public interface UserRepository extends JpaRepository<User, Long> { }
public interface PhoneRepository extends JpaRepository<Phone, Long> { }
其餘控制器:
@RestController
@RequestMapping(path="/api")
public class UserController {
@Autowired
private UserRepository ur;
@PostMapping(path="/add")
public @ResponseBody String addNewUserPost(@RequestBody User user) {
// ur.save(user); /* UPDATED - line removed */
ur.save(user.updatePhoneUserId(user)); /* UPDATED - line added */
return "Saved";
}
}
很棒的輸入!適用於我 - 謝謝!我更新了代碼和上面的代碼片段,標記爲/ * UPDATED * /。你會做什麼? – zaggi
@zaggi是的,這樣的事應該工作,當你有一個關係,你需要保存用戶,然後將其設置爲電話,並將手機保存到數據庫,所以user_id不應該爲空,因爲用戶被保存並在用戶表中有一個ID。 –