java - 从字段自动 hibernate map ID

我有类似的东西：

@Entity
@Table(name = "claim", schema = "test")
public class Claim implements Serializable {

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Column(name = "idClaim", unique = true, nullable = false)
   private Integer idClaim;

   @OneToOne(mappedBy = "claim", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
   @JsonManagedReference
   private ClaimReturnInfo claimReturnInfo;

   @Column(name = "notes")
   private String notes;

   // Getters and setters
}


@Entity
@Table(name = "claim_returninfo", schema = "test")
public class ClaimReturnInfo implements Serializable {

   @Id
   @Column(name = "Claim_idClaim")
   private Integer id;

   @MapsId("Claim_idClaim")
   @OneToOne(fetch = FetchType.LAZY)
   @JoinColumn(name = "Claim_idClaim")
   @JsonBackReference
   private Claim claim;

   @Column(name = "description")
   private String description;

   // Getters and setters
}

未自动生成ClaimReturnInfo Id，因为我们要从其父级（Claim）传播该Id。我们无法自动执行此操作，并且会出现此错误：当在ClaimReturnInfo中执行“ cascade”时，在调用save（）之前必须手动分配此类的ID。

是否可以将Claim Id映射到ClaimReturnInfo Id还是应该手动执行？

即使我们在ClaimReturnInfo上手动设置了此ID，并且可以执行更新，但在尝试创建新的Claim时仍然会收到此错误：

// POST -> claimRepository.save() -> Error
{
    "notes": "Some test notes on a new claim",
    "claimReturnInfo": {
        "description": "Test description for a new claimReturnInfo"
    }
}

在服务实现中：

@Override
@Transactional
public Claim save(Claim claim) throws Exception {
    if(null != claim.getClaimReturnInfo()) {
        claim.getClaimReturnInfo().setId(claim.getIdClaim());
    }

    Claim claimSaved = claimRepository.save(claim);
    return claimSaved;
}

最佳答案

我尝试使用以下映射，从您的评论中可以明显看出，Json对象已正确填充。
我注意到@MapsId注释是罪魁祸首，如果您查看@MapsId注释的文档，它会说


  块引用


复合键中的属性名称
     *关系属性对应的*。如果不
     *提供，该关系映射实体的主要对象
     *键


  块引用


如果将@MapsId（“ Claim_idClaim”）更改为@MapsId，它将开始保留您的实体。

import javax.persistence.*;

@Entity
@Table(name = "CLAIM")
public class Claim {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "idClaim", unique = true, nullable = false)
    private Long idClaim;
    @Column(name = "notes")
    private String notes;

    @OneToOne(mappedBy = "claim", cascade = CascadeType.ALL, optional = false)
    private ClaimReturnInfo claimReturnInfo;

    public Long getIdClaim() {
        return idClaim;
    }

    public String getNotes() {
        return notes;
    }

    public void setNotes(String notes) {
        this.notes = notes;
    }


    public ClaimReturnInfo getClaimReturnInfo() {
        return claimReturnInfo;
    }

    public void setClaimReturnInfo(ClaimReturnInfo claimReturnInfo) {
        if (claimReturnInfo == null) {
            if (this.claimReturnInfo != null) {
                this.claimReturnInfo.setClaim(null);
            }
        } else {
            claimReturnInfo.setClaim(this);
        }
        this.claimReturnInfo = claimReturnInfo;
    }

}


package com.hiber.hiberelations;

import javax.persistence.*;

@Entity
@Table(name = "CLAIM_RETURN_INFO")
public class ClaimReturnInfo {

    @Id
    @Column(name = "Claim_idClaim")
    private Long childId;


    @Column(name = "DESCRIPTION")
    private String description;

    @MapsId
    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "Claim_idClaim")
    private Claim claim;

    public Long getChildId() {
        return childId;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Claim getClaim() {
        return this.claim;
    }

    public void setClaim(Claim claim) {
        this.claim = claim;
    }
}