java - SpringData CrudRepository 应用自动级联类型

问题描述

在我的项目中，我必须连接到现有数据库并执行更新两个表的逻辑。

我的设置如下：

@Entity
@Table(name = "DOCUMENTCONTENT")
@Getter
public class DocumentContent {

    @Id
    @Column(name = "ID", insertable = false, updatable = false)
    private Long id;

    @OneToOne
    @JoinColumn(name = "DOCUMENT_ID", insertable = false, updatable = false)
    private Document document;

    @Lob
    @Column(name = "CONTENT")
    @Setter
    private byte[] content;
}

@Entity
@Table(name = "DOCUMENT")
@Getter
public class Document {

    @Id
    @Column(name = "ID", insertable = false, updatable = false)
    private Long id;

    @OneToOne(mappedBy = "document")
    private DocumentContent documentContent;

    @OneToMany(mappedBy = "document", fetch = EAGER)
    private List<Attachment> attachments;
}

@Entity
@Table(name = "ATTACHMENT")
@Getter
public class Attachment {

    @Id
    @Column(name = "ID")
    private Long id;

    @ManyToOne
    @JoinColumn(name = "DOCUMENT_ID", insertable = false, updatable = false)
    private Document document;

    @ManyToOne
    @JoinColumn(name = "CONTRACT_ID",updatable = false, insertable = false)
    private Contract contract;
}

@Entity
@Table(name = "CONTRACT")
@Getter
public class Contract {

    @Id
    @Column(name = "ID", insertable = false, updatable = false)
    private Long id;

    @Column(name = "STATUS")
    @Setter
    private String status;

    @ManyToOne
    @JoinColumn(name = "CUSTOMER_ID", insertable = false, updatable = false)
    private Customer customer;

    @OneToMany(mappedBy = "contract", fetch = EAGER)
    private List<Attachment> attachments;
}

@Service
public class MyServiceImpl implements MyService {

    @Autowired
    private DocumentContentRepository documentContentRepository; // spring data Crud Repository

    @Override
    @Transactional
    public void updateDocumentContent(SomeDto someDto) {
        DocumentContent documentContent = documentContentRepository.findByDocumentId(someDto.getDocumentId());
        documentContent.setContent(someDto.getBytes());
        List<Contract> contracts = documentContent.getDocument().getAttachments()
                .stream().map(Attachment::getContract).collect(toList());
        contracts.forEach(contract -> contract.setStatus("SIGNED"));
        documentContentRepository.save(documentContent);
    }
}

当我从上述服务触发方法时，我可以在控制台输出中注意到这些 SQL：

休眠：更新文档内容集内容=？哪里id=？
休眠：更新合约集状态=？哪里id=？

我理解为什么 jpa 在 documentcontent 表中执行了第一次更新，但我不知道它为什么在 contract 表中也进行了更新。如您所见，我没有CascadeType.MERGE在任何实体中使用。

你能解释一下为什么在没有声明级联类型的情况下执行了第二次更新吗？

标签： javaspringhibernatejpacascade

java - SpringData CrudRepository 应用自动级联类型

问题描述

解决方案

推荐阅读