Spring数据JPA按嵌入对象查找属性

Question

我想要编写一个Spring Data JPA存储库接口方法签名，它将允许我查找实体中具有嵌入对象属性的实体。有没有人知道这是否可能，如果可能，如何实现？

@Entity
@Table(name = "BOOK_UPDATE_QUEUE", indexes = { uniqueConstraints = @UniqueConstraint(columnNames = {
        "bookId", "region" }, name = "UK01_BOOK_UPDATE_QUEUE"))
public class QueuedBook implements Serializable {

    @Embedded
    @NotNull
    private BookId bookId;

    ...

}

@Embeddable
public class BookId implements Serializable {

    @NotNull
    @Size(min=1, max=40)
    private String bookId;

    @NotNull
    @Enumerated(EnumType.STRING)
    private Region region;

    ...

}

public interface QueuedBookRepo extends JpaRepository<QueuedBook, Long> {

    //I'd like to write a method like this, but can't figure out how to search by region,
    //when region is actually a part of the embedded BookId
    Page<QueuedBook> findByRegion(Region region, Pageable pageable);

}

Answer 1

这个方法名应该起作用：

Page<QueuedBook> findByBookIdRegion(Region region, Pageable pageable);

参考单据的查询派生部分提供更多信息。