Java Spring存储库和延迟加载

我有亲子关系，比如图书馆和书籍

public class Library {    
  @OneToMany()
  private List<Books> books;    
}

public class Book {    
 @ManytoOne()
 private  Library;
}

public interface LibraryRepository extends PagingAndSortingRepository<Library, Long> {
}

---

在查询图书馆存储库时，我会得到图书以及图书馆信息。我不想在查询中列出图书，只想得到所有的图书馆

使用fetch=FetchType.LAZY：

public class Library {

@OneToMany(fetch = FetchType.LAZY)
private List<Books> books;

}

在控制器类中初始化dto：

    List<Library> libraries = serviceLibrary.getLibraries();

    List<LibraryDTO> libraryDTOs= new ArrayList<LibraryDTO>();
    for (Library library: libraries) {
       libraryDTOs.append(new LibraryDTO(library));
    }

---

在这里查找获取的类型

    List<Library> libraries = serviceLibrary.getLibraries();

    List<LibraryDTO> libraryDTOs= new ArrayList<LibraryDTO>();
    for (Library library: libraries) {
       libraryDTOs.append(new LibraryDTO(library));
    }