Question

我无法使用SpringBoot将ArrayList中的2个以上的元素保存到MySQL。当我对数组中的一个对象发出发布请求（Postman或Alamofire）时，我得到状态码200，否则我得到状态码500和springboot控制台中的此错误消息：

java.sql.SQLIntegrityConstraintViolationException：无法添加或更新子行：外键约束失败（quran-pro-core。surah，CONSTRAINT FKibuxjpjiwpq46220g7sn7y1q外键（id）参考文献reciter（documentid）

这些是我的课程：

@RestController
public class ReciterController {

     @Autowired
     private ReciterService reciterService;

     @PostMapping("/reciters")
     public String saveReciter(@RequestBody Reciter reciter) {
     reciterService.saveReciter(reciter);
     return "SUCCESS";
   }
}

@Service
public class ReciterService {

     @Autowired
     private ReciterRepostitory reciterRepository;

     public void saveReciter(Reciter reciter) {
     reciterRepository.save(reciter);
     }
}

@Entity
public class Reciter {

     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long documentID;

     @Column
     private String name;
     @Column
     private String image;
     @OneToMany(mappedBy="id", cascade = CascadeType.ALL)
     private List<Surah> surahs;

     // Constructor and getters and setters
}

@Entity
public class Surah {

     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;

     @Column
     private String name;
     @Column
     private int number;

     // Constructor and getters and setters

}

此主体有效：

{
"name": "reciter1",
"image": "/reciter1/image.png",
"surahs": [
         {
            "name": "LOLll",
            "number": 0
        }

]
}

这不是：

{
"name": "reciter1",
"image": "/reciter1/image.png",
"surahs": [
         {
            "name": "LOLll",
            "number": 0
        },
        {
            "name": "test2",
            "number": 1
        }
]
}

enter code here

Answer 1

您的ManyToOne配置不正确，必须使用mappedBy元素来指定作为关系所有者的实体的关系字段或属性

第一个建议，使用双向关系：

public class Reciter {

     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long documentID;

     @Column
     private String name;
     @Column
     private String image;
     @OneToMany(mappedBy="reciter", cascade = CascadeType.ALL)
     private List<Surah> surahs;

     // Constructor and getters and setters

}

@Entity
public class Surah {

     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;

     @Column
     private String name;
     @Column
     private int number;

     @ManyToOne
    private Reciter reciter;
}

或使用单向关系：

 @OneToMany(cascade = CascadeType.ALL)
 private List<Surah> surahs;

使用SpringBoot无法将ArrayList中的2个以上的元素保存到MySQL吗？

1 个答案: