JPA在许多关系上创建手动查询

Question

我有一个贷款表和一个相册表，该表已连接到一个ManytoMany关系。

我正在尝试创建一个查询，以根据专辑被借出的次数列出最受欢迎的专辑。

贷款类：

@Entity
public class Loan implements Serializable {

private static final long serialVersionUID = 0x62B6DA99AA12AAA8L;

@Column @GeneratedValue(strategy = GenerationType.AUTO) @Id private Integer id;

@ManyToMany(fetch = FetchType.LAZY)
private List<Album> album;

@Column private String dateLoaned;
@Column private String dateToReturn;
@Column private String dateReturned;
@Column private Boolean active=false;

相册类：

@Entity
public class Album implements Serializable {

private static final long serialVersionUID = 0x63A6DA99AA12AAA8L;

@Column @GeneratedValue(strategy = GenerationType.AUTO) @Id private Integer id;

@Column (unique=true) private String barcode;
@Column private String band;
@Column private String title;
@Column private String genre;
@Column private Integer year;
@Column private String artworkFilename;
@Column private Boolean enabled;
@Column private Boolean isLoanable;
@Column private Integer numberOfCopies;

@ManyToMany()
private List<Loan> loan;

在我的相册存储库中，我一直试图构造一个查询来执行此操作，但是它不起作用。

@Query(" ")
List<Album> getPopularAlbums();

我尝试使用“ select from from album_loan where 1” 类型的东西创建一个简单查询，但总是收到_“ album_loan not mapping” _错误。