一對一映射獲取空值 Spring boot JPA Hibernate

Question

我已經實現了一對一的關系，當我嘗試插入值時，它給出了以下異常。

我已經嘗試了很多 stackoverflow 的答案，但還沒有運氣。 我無法弄清楚出了什么問題。

例外 ：

org.springframework.dao.DataIntegrityViolationException：非空屬性引用空值或瞬態值

not-null 屬性引用空值或瞬態值

全包實體

@Entity(name = "FullPack")
@Table(name = "fullpack")
@TypeDefs({
        @TypeDef(name = "json", typeClass = JsonStringType.class),
        @TypeDef(name = "jsonb", typeClass = JsonBinaryType.class)
})
public class FullPack {

    @Id
    @Column(name = "fullpack_id")
    int fullPackId;

    @Type(type = "json")
    @Column(columnDefinition = "json")
    private String sequence;

    @Type(type = "json")
    @Column(columnDefinition = "json")
    private String channelRestriction;


    @Type(type = "json")
    @Column(columnDefinition = "json")
    private String actNotAllowed;


    @Type(type = "json")
    @Column(columnDefinition = "json")
    private String packCompose;

}

包裝序列實體

@Entity
public class PackSequence {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    int packSequenceId;

    int sequenceId;

    int packId;


    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "fullpack_packsequence_id", referencedColumnName = "fullpack_id", nullable = false)
    private FullPack fullPack;
}

向 FullPack 表插入記錄（有意為 JSON 字段插入空值）

{
    "fullPackId": 1,
    "sequence": null,
    "channelRestriction": null,
    "actNotAllowed": null,
    "packCompose": null
}

將記錄插入到 PackSequence 表

從 Chun 的回答更新，但存在同樣的問題

  {
        "sequenceId":1,
        "packId":2,
        "fullpack" : {
            "fullpack_id":1
        }
  }

Mysql 表結構

整包表

包裝順序表

Answer 1

我相信這可能與從 Postman 到 PackSequence 的 Json 轉換有關，並且 FullPack 對象已發出

您將需要使用 JsonProperty 來幫助重新映射字段名稱。

我必須修改你的 PackSequence 和 FullPack 對象如下

@Entity
@JsonIgnoreProperties(ignoreUnknown = true)
public class PackSequence {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    int packSequenceId;

    int sequenceId;

    int packId;


    @OneToOne()
    @JoinColumn(name = "fullpack_packsequence_id", referencedColumnName = "fullpack_id", nullable = false)
    @JsonProperty("fullpack")
    private FullPack fullPack;

    // omit getter and setter
}

@Entity(name = "FullPack")
@Table(name = "fullpack")
@JsonIgnoreProperties(ignoreUnknown = true)
public class FullPack
{

    @Id
    @Column(name = "fullpack_id")
    @JsonProperty("fullpack_id")
    int fullPackId;

    private String sequence;
    private String channelRestriction;
    private String actNotAllowed;
    private String packCompose;

    // omit getter and setter
}

假設您通過 RestController 等從 JSON Payload 插入對象。

PackSequence json 對象應如下所示

{
    "sequenceId":1,
    "packId":2,
    "fullpack" : {
        "fullpack_id":1
    }
}