Spring Data - 存储库方法名称中的OR条件

问题描述

在我的Spring Data项目中，我有一个以下实体：

In my Spring Data project I have a following entity:

@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 ，查找 CardPair > board 和卡。对我来说更复杂的情况是卡因为我需要构建一个条件，其中 card1 = card或card2 = card

I need to implement a Spring Data repository method that will look for a CardPair based on cardPairId, board and card. The more complicated case to me is a Card because I need to construct a condition where 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？

Is it possible to provide this condition via Spring Data repository method name ?

例如

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

是否可以翻译此条件 card1 = card或card2 = card 在方法名称中？

Is it possible to translate this condition card1 = card or card2 = card in a method name ?

推荐答案

由于您需要使用方法名称，因此无法实现此目的最后一个条件在括号中： id =？ AND board =？ AND（card1 =？或card2 =？）。无法从方法名称推断出这一点，因为它仅用于涵盖基本情况。

It is impossible to achieve this using just method name since you need the last condition to be in parentheses: id = ? AND board = ? AND (card1 = ? OR card2 = ?). There is no way to infer this from method name since it is intended to cover basic cases only.

您的案例有三种方式：

• @Query注释（最适合你的人）


• 命名查询


• 规格

• @Query annotation (the best candidate for you) http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods.at-query
• Named queries http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods.named-queries
• Specifications http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#specifications

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