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?
最佳答案
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。
关于java - Spring Data JPA 通过嵌入对象属性查找,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24441411/