Question

在我的客户端服务器应用程序中，我使用JavaFx作为客户端，Java hibernate作为数据库连接的服务器。

问题

我有一个保存按钮，每按一次按钮，envers会创建一个修订版，表值是否没有变化。基本上它不会将旧数据检查到新数据，只是创建修订。

这是我的bean代码

@Entity
@Audited
@Table(name = "DOMAIN")
public class Domain implements java.io.Serializable {

private Long domainId;
private String domainName;
private String dataType;
private Long valueSize;
private Long valuePrecision;
private Long valueScale;
private String valueRangeLow;
private String valueRangeHigh;
private String description;
private String comments;
private Date effectiveStartDate;
private Date effectiveEndDate;
private String status;

public Domain() {
}

public Domain(Long domainId, String domainName, String dataType,
        Date effectiveStartDate, Date effectiveEndDate, String status) {
    this.domainId = domainId;
    this.domainName = domainName;
    this.dataType = dataType;
    this.effectiveStartDate = effectiveStartDate;
    this.effectiveEndDate = effectiveEndDate;
    this.status = status;
}

public Domain(Long domainId, String domainName, String dataType,
        Long valueSize, Long valuePrecision,
        Long valueScale, String valueRangeLow, String valueRangeHigh,
        String description, String comments, Date effectiveStartDate,
        Date effectiveEndDate, String status) {
    this.domainId = domainId;
    this.domainName = domainName;
    this.dataType = dataType;
    this.valueSize = valueSize;
    this.valuePrecision = valuePrecision;
    this.valueScale = valueScale;
    this.valueRangeLow = valueRangeLow;
    this.valueRangeHigh = valueRangeHigh;
    this.description = description;
    this.comments = comments;
    this.effectiveStartDate = effectiveStartDate;
    this.effectiveEndDate = effectiveEndDate;
    this.status = status;
}

@Id
@GeneratedValue(generator = "DOMAIN_SEQ")
@SequenceGenerator(name="DOMAIN_SEQ", sequenceName="DOMAIN_SEQ",allocationSize=1)
@Column(name = "DOMAIN_ID", unique = true, nullable = false, precision = 22, scale = 0)
public Long getDomainId() {
    return this.domainId;
}

public void setDomainId(Long domainId) {
    this.domainId = domainId;
}

@Column(name = "DOMAIN_NAME", nullable = false, length = 50)
public String getDomainName() {
    return this.domainName;
}

public void setDomainName(String domainName) {
    this.domainName = domainName;
}

@Column(name = "DATA_TYPE", nullable = false, length = 50)
public String getDataType() {
    return this.dataType;
}

public void setDataType(String dataType) {
    this.dataType = dataType;
}

@Column(name = "VALUE_SIZE", precision = 22, scale = 0)
public Long getValueSize() {
    return this.valueSize;
}

public void setValueSize(Long valueSize) {
    this.valueSize = valueSize;
}

@Column(name = "VALUE_PRECISION", precision = 22, scale = 0)
public Long getValuePrecision() {
    return this.valuePrecision;
}

public void setValuePrecision(Long valuePrecision) {
    this.valuePrecision = valuePrecision;
}

@Column(name = "VALUE_SCALE", precision = 22, scale = 0)
public Long getValueScale() {
    return this.valueScale;
}

public void setValueScale(Long valueScale) {
    this.valueScale = valueScale;
}

@Column(name = "VALUE_RANGE_LOW", length = 50)
public String getValueRangeLow() {
    return this.valueRangeLow;
}

public void setValueRangeLow(String valueRangeLow) {
    this.valueRangeLow = valueRangeLow;
}

@Column(name = "VALUE_RANGE_HIGH", length = 50)
public String getValueRangeHigh() {
    return this.valueRangeHigh;
}

public void setValueRangeHigh(String valueRangeHigh) {
    this.valueRangeHigh = valueRangeHigh;
}

@Column(name = "DESCRIPTION", length = 200)
public String getDescription() {
    return this.description;
}

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

@Column(name = "COMMENTS")
public String getComments() {
    return this.comments;
}

public void setComments(String comments) {
    this.comments = comments;
}

@Temporal(TemporalType.DATE)
@Column(name = "EFFECTIVE_START_DATE", nullable = false, length = 7)
public Date getEffectiveStartDate() {
    return this.effectiveStartDate;
}

public void setEffectiveStartDate(Date effectiveStartDate) {
    this.effectiveStartDate = effectiveStartDate;
}

@Temporal(TemporalType.DATE)
@Column(name = "EFFECTIVE_END_DATE", nullable = false, length = 7)
public Date getEffectiveEndDate() {
    return this.effectiveEndDate;
}

public void setEffectiveEndDate(Date effectiveEndDate) {
    this.effectiveEndDate = effectiveEndDate;
}

@Column(name = "STATUS", nullable = false, length = 50)
public String getStatus() {
    return this.status;
}

public void setStatus(String status) {
    this.status = status;
}

问题仅出在客户端服务器应用程序上。

使用普通的独立程序，它运行正常。

有人能帮帮我吗？我坚持到这一点。我错过了任何罐子或其他东西吗？如果您需要更多关于问题的说明，请告诉我。

服务器端代码

public long saveDomainFromJson(String domainJsonData) throws Exception {
    long domainId = 0;
    try {
        // here I am setting data to bean, getting from client side
        Domain domain = getDomainFromJson(domainJsonData);           

        Session session = HibernateUtil.currentSession();
        Transaction tx = session.beginTransaction();

        domainId  = session.saveOrUpdate(domain);

        tx.commit();
        HibernateUtil.closeSession();

    } catch (Exception e) {
        e.printStackTrace();
        throw e;
    }
    return domainId;
}

Json数据

{
  "DOMAIN_ID":36,
  "DOMAIN_NAME":"Test_Type",
  "DOMAIN_DATA_TYPE":"STRING",
  "DOMAIN_EFF_START_DATE":"2016-11-08",
  "DOMAIN_EFF_END_DATE":"2099-12-31",
  "DOMAIN_STATUS":"Draft",
  "DOMAIN_DESCRIPTION":"Object Type: Added for testing purpose"
}

Answer 1

抱歉，我很快就没有看到这一点，但问题是您拨打session#save。在Session here的javadoc中，您会注意到以下段落：

save（）和persist（）导致SQL EXERT，SQL DELETE中的delete（）和SQL UPDATE中的update（）或merge（）。在刷新时检测到对持久实例的更改，并且还会导致SQL UPDATE。 saveOrUpdate（）和replicate（）导致INSERT或UPDATE。

所以你基本上想要使用session#saveOrUpdate，以便根据实体的状态获得插入和更新语义。

由于session#save正在生成新的INSERT操作，因此Envers将始终为该案例创建新版本。

对于每个保存（更新）hibernate envers创建的修订版本在表中是否更改

1 个答案: