spring-data-jpa

来源： https://stackoverflow.com/questions/38045439/technical-differences-between-spring-data-jpas-findfirst-and-findtop

来源： https://stackoverflow.com/questions/38045439/technical-differences-between-spring-data-jpas-findfirst-and-findtop

来源： https://stackoverflow.com/questions/38045439/technical-differences-between-spring-data-jpas-findfirst-and-findtop

来源： https://stackoverflow.com/questions/63110054/when-creating-credit-cards-for-a-single-user-it-only-updates-the-previous-card

来源： https://stackoverflow.com/questions/63096128/jpa-override-auto-generated-id-for-composite-key

来源： https://stackoverflow.com/questions/47948450/spring-data-repository-not-found-at-compile-time

来源： https://stackoverflow.com/questions/63284812/chainedtransaction-manager-throws-heuristiccompletionexception-and-not-rollback

来源： https://stackoverflow.com/questions/48882265/spring-boot-crudrepository-or-jparepository-how-to-pass-limit-as-argument

问题 I have one-directional related entities: @Entity public class Book { private String isbn; } @Entity private class Recommentation { @ManyToOne(optional = false, fetch = FetchType.LAZY) @JoinColumn(name = "book_id", nullable = false) @OnDelete(action = OnDeleteAction.CASCADE) private Book book; } And the following test: @RunWith(SpringRunner.class) @DataJpaTest public class BookRepositoryTest { @Autowired private TestEntityManager testEntityManager; @Autowired private BookRepository

问题 I'm kind of new to Spring JPA, so I apologize in advance if my question sounds basic. I have 2 entity objects: OrderInfo, and PersonInfo. The classes are as below: @Entity @Table(name="order_info") @NamedQuery(name="OrderInfo.findAll", query="SELECT o FROM OrderInfo o") public class OrderInfo implements Serializable { @Column(name="order_number") private String orderNumber; //bi-directional many-to-one association to PersonInfo @ManyToOne @JoinColumn(name="person_id") private PersonInfo