java - Spring Data - 存储库方法名称中的 OR 条件

Question

在我的 Spring Data 项目中，我有以下实体:

@Entity
@NamedEntityGraph(name = "graph.CardPair", attributeNodes = {})
@Table(name = "card_pairs")
public class CardPair extends BaseEntity implements Serializable {

    private static final long serialVersionUID = 7571004010972840728L;

    @Id
    @SequenceGenerator(name = "card_pairs_id_seq", sequenceName = "card_pairs_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "card_pairs_id_seq")
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "card1_id")
    private Card card1;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "card2_id")
    private Card card2;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "selected_card_id")
    private Card selectedCard;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "board_id")
    private Board board;

....

}

我需要实现一个 Spring Data 存储库方法，该方法将根据 cardPairId、board 和 card< 查找 CardPair/。对我来说更复杂的情况是 Card 因为我需要构造一个条件 card1 = card or card2 = card

是否可以通过 Spring Data 存储库方法名称提供此条件？

例如

cardPairRepository.findByIdAndBoardAnd[card1 = card or card2 = card]AndSelectedCardIsNull(cardPairId, board, card);

是否可以在方法名称中翻译此条件card1 = card or card2 = card？

Answer 1

仅使用方法名称是不可能实现这一点的，因为您需要将最后一个条件放在括号中:id = ?和板=？ AND (card1 = ? OR card2 = ?)。无法从方法名称中推断出这一点，因为它仅涵盖基本情况。

在你的情况下有三种方式:

• @Query 注解(最适合你的人选)http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods.at-query
• 命名查询 http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods.named-queries
• 规范 http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#specifications