[英]Primary key of Parent Entity not stored as Foreign Key in Child Entity
我在spring數據Jpa中使用OneToMany關系並使用postMan測試api
@Entity
@Table(name = "book_category")
public class BookCategory {
ParentEntity
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "bookCat_id")
private Long id;
private String name;
@OneToMany(cascade = CascadeType.ALL, mappedBy="bookCategory")
private Set<Book> books;
public BookCategory(String name, Set<Book> books) {
this.name = name;
this.books = books;
}
// getter and setter
}
ChildEntity
@Entity
@Table(name = "book")
public class Book {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "book_id")
private Long bookId;
private String name;
@ManyToOne(cascade = CascadeType.PERSIST)
@JoinColumn(name = "bookCat_id")
BookCategory bookCategory;
public Book() {
}
//getter and Setter
}
ControllerClass
@RestController
@RequestMapping(value = "/bookCategory")
public class BookController {
@Autowired
BookCategoryRepository bookCategoryRepository;
@Autowired
BookRepository bookRepository;
@PostMapping("/addBookCategory")
public BookCategory savePerson(@Valid @RequestBody BookCategory bookCategory){
return bookCategoryRepository.save(bookCategory);
}
}
從郵遞員那里打電話給Rest Api並傳遞json為
{
"name":"Category 1",
"books":[
{"name" : "Hello Koding 1"},
{"name":"Hello Koding 2"}
]
}
以下查詢是通過hibernate執行查詢也是正確的,而我正在調用休息點的東西Hibernate:插入book_category(name)值(?)Hibernate:插入book(book_cat_id,name)值(?,?)
它沒有插入book_cat_id,在book_cat_id中傳遞null,因此null獲取存儲
數據庫中存儲的數據book_category數據庫中的父表
book(ChildTable) 書(ChildTable)我想得到Child Table就像我想要這樣的表
問題是您沒有在子對象中設置父級。 代碼中的某處你應該調用
public void setBookCategory(BookCategory bookCategory) { ... }
Book實體的方法。
我建議在使用控制器DTO的,並將它們映射到業務層實體,如使用peristent實體來解決這一問題作為HTTP請求的參數可能會導致嚴重的安全漏洞作為解釋在這里 。
編輯:或者,甚至認為我不鼓勵這個解決方案是修改像這樣的savePerson方法
@PostMapping("/addBookCategory")
public BookCategory savePerson(@Valid @RequestBody BookCategory bookCategory){
bookCategory.getBooks().forEach(book -> book.setBookCategory(bookCategory));
return bookCategoryRepository.save(bookCategory);
}
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