java - Spring Data JPA 通过嵌入对象属性查找

Question

我想编写一个 Spring Data JPA 存储库接口(interface)方法签名，它可以让我在该实体中找到具有嵌入对象属性的实体。有谁知道这是否可行，如果可以，怎么办？

这是我的代码:

@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);

}

我可以使用 Spring Data 为此编写查询吗？

Answer 1

这个方法名应该可以解决问题:

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

更多信息请参见关于 query derivation 的部分引用文档。