Java 如何在Spring JPA中更新嵌入ID的字段

我有一个RecordId类，它是可嵌入的，并且在Record类中作为嵌入ID被引用。RecordId具有版本和日期字段。在记录的更新操作期间，我必须更新记录ID的字段，即版本。我正在使用下面的代码来实现这一点

existingRecord.getRecordId().setVersion(recordData.getRecordId().getVersion());
recordRepository.save(existingRecord);

但是数据库中的数据没有得到更新

更新EmbeddedId的字段是否有限制

// Embeddable class

@Embeddable
public class RecordId implements Serializable{
/**
 * 
 */
private static final long serialVersionUID = 8167040004250354298L;

@Column(name="Record_DOMAIN", nullable = false)
@NotNull(message = "Record Domain cannot be empty")
@JsonProperty("RecordDomain")
private String recordDomain;

@Column(name="ENVIRONMENT_TYPE", nullable = false)
@NotNull(message = "Environment Type cannot be empty")
@Enumerated(EnumType.STRING)
@JsonProperty("environmentType")
private EnvironmentTypes environmentType;

@Column(name="UPGRADE", nullable = false)
@JsonProperty("upgrade")
private boolean upgrade;

@Column(name="VERSION", nullable = false)
@JsonProperty("version")
private String version = "2.0";

@ApiModelProperty(value = "Enironment type for which the Record Domain is 
created.", required = true )
public EnvironmentTypes getEnvironmentType() {
    return environmentType;
}

public void setEnvironmentType(EnvironmentTypes environmentType) {
    this.environmentType = environmentType;
}

@ApiModelProperty(value = "Cusotmer Domain name", required = true )
public String getRecordDomain() {
    return recordDomain;
}

public void setRecordDomain(String recordDomain) {
    this.recordDomain = recordDomain;
}


public RecordId(){
}

public RecordId(String recordDomain, EnvironmentTypes environmentType){
    this.recordDomain = recordDomain;
    this.environmentType = environmentType;
}

public RecordId(String recordDomain, EnvironmentTypes environmentType, 
boolean upgrade, String version){
    this.recordDomain = recordDomain;
    this.environmentType = environmentType;
    this.upgrade = upgrade;
    this.version = version;
}

public boolean isUpgrade() {
    return upgrade;
}

public void setUpgrade(boolean upgrade) {
    this.upgrade = upgrade;
}

public String getVersion() {
    return version;
}

public void setVersion(String version) {
    if( version != null) {
        this.version = version;
    }else {
        this.version = "18.2";
    }
}

@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof RecordId)) return false;
    RecordId that = (RecordId) o;
    return Objects.equals(getRecordDomain(), that.getRecordDomain()) &&
            Objects.equals(getEnvironmentType(), 
    that.getEnvironmentType());
}

@Override
public int hashCode() {
    return Objects.hash(getRecordDomain(), getEnvironmentType());
}

}

记录具有嵌入Id的类，该类使用上述可嵌入类作为复合键

@Entity
@Table(name="RECORD_DATA") 
public class Record implements Serializable{

private static final long serialVersionUID = 1L;

@EmbeddedId
private RecordId recordId;

public RecordId getRecordId() {
    return recordId;
}

public void setRecordId(RecordId recordId) {
    this.recordId = recordId;
}

public Record() {
}

public Record(RecordId recordId) {
    this.recordId = recordId;
}
}

JPA repository与Record类的接口

// JPA Repository
public interface RecordRepository extends JpaRepository<Record, RecordId>{
}

//JPA存储库
公共接口RecordRepository扩展了JpaRepository{
}

无法更新实体的ID，因为此ID用于在关系数据库中创建主键。然后将用于生成sql update语句

假设现有数据库中只有一条ID为A的记录。 然后在java中，您将这个id更改为B。JPA将把它转换为类似SQL的代码

UPDATE record WHERE Id = 'B'

但是没有以“B”作为ID的记录！ 结果是数据库中根本没有更新

---

在这种情况下，您可能应该使用生成的id。

能否更改RecordId.class中的equals方法

你可以像这样轻松地写作

@Override
public boolean equals(Object obj) {
    return super.equals(obj);
}

---

请提供您正在尝试保存的实体和@Embeddeble class。添加了我正在与Embeddeble class一起保存的实体。是否可以尝试将默认构造函数添加到

RecordId.class

-->

public RecordId（）{}

它已经存在了；当您设置对象的版本时，对象并没有根据equals方法进行更改。您能否更改equals方法的逻辑取决于您的业务逻辑，而不是当前使用的。您的解释帮助我清楚地理解。经过一番研究，我得出了同样的结论。