java - 如何坚持使用 Hibernate

Question

我有一个名为“ token 请求者”和“证书”的类。每个 token 请求者都有许多证书，并且证书只有一个 token 请求者。

TokenRequestor.java

@Entity
@Table(name = "TOKEN_REQUESTOR")
public class TokenRequestor implements Serializable {

    @Id
    @SequenceGenerator(name = "TOKEN_REQUESTOR_ID_GENERATOR", sequenceName = "TOKEN_REQUESTOR_ID")
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "TOKEN_REQUESTOR_ID_GENERATOR")
    @Column(name = "TOKEN_REQUESTOR_ID")
    private Long id;
    @OneToMany(mappedBy = "tokenRequestorId")
    private List<Certificate> certificates;

证书.java

@Entity
@Table(name = "CERTIFICATES")
public class Certificate {

    @Id
    @SequenceGenerator(name = "CERTIFICATES_ID_GENERATOR", sequenceName = "SQ_CERTIFICATES_ID")
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "CERTIFICATES_ID_GENERATOR")
    @Column(name = "CERTIFICATES_ID")
    private Long id;
    @ManyToOne(fetch = FetchType.EAGER,cascade = CascadeType.ALL)
    @JoinColumn(name = "TOKEN_REQUESTOR_ID")
    private TokenRequestor tokenRequestorId;    //Foreign key*/

当我插入 token 请求者时，必须创建它们的证书。它们已创建，但证书表中的 TOKEN_REQUESTOR_ID 为空。为什么会出现这种情况？

POST token 请求者

{
    "domain": "GTW",
    ...,
    "certificates": [
    {
      "usage": "ENC",
      "alias": "encryption_cert",
      "content": "-----BEGIN CERTIFICATE----- ... -----END CERTIFICATE-----"
    },
    {
      "usage": "DEC",
      "alias": "decryption_cert",
      "content": "-----BEGIN CERTIFICATE----- ... -----END CERTIFICATE-----"
    },
    {
      "usage": "SSL",
      "alias": "communication_cert",
      "content": "-----BEGIN CERTIFICATE----- ... -----END CERTIFICATE-----"
    },
    {
      "usage": "CA",
      "alias": "TSP ROOT CA",
      "content": "-----BEGIN CERTIFICATE----- ... -----END CERTIFICATE-----"
    }
  ]
}

Answer 1

您的问题是您将关系定义为双向的，这基本上意味着关系的每一方都应该引用另一方。

假设我们有 TokenRequestor 对象，该对象有两个证书，只有当关系是单向的(您可以将您的关系转向解决此问题)时，这才足够，对于双向关系，您需要每个都有一个持有对其 TokenReguestor 的引用的证书。