jpa-derby 布尔合并

Question

我正在使用 JPA(EclipseLink) 和 Derby。在我的对象中有一个布尔字段。在合并操作之前，该字段设置为 true。但合并后，该字段仍然持有假值。

@Entity
@Access(AccessType.PROPERTY)
public class SleepMeasure extends AbstractEntity {
    private static final long serialVersionUID = 1361849156336265486L;

    ...
    private boolean WeatherDone;

    public boolean isWeatherDone() { // I have already tried with the "getWeatherDone()"
        return WeatherDone;
    }

    public void setWeatherDone(boolean weatherDone) {
        WeatherDone = weatherDone;
    }   
    ...
}

好像无所谓，我用"getWeatherDone()"还是"isWeatherDone()"。

使用代码：

public class WeatherDataCollectorImpl{
    ...
    private void saveMeasures(WeatherResponse mResponse, SleepMeasure sleep) throws Exception {

        AppUser owner = sleep.getOwner();
        ...
        sleep.setWeatherDone(Boolean.TRUE);
        reposService.updateEntity(sleep,SleepMeasure.class);
    }
    ...
}

这是我的存储库 class

    public class RepositoryImpl{
    ...
    public <T extends AbstractEntity> T updateEntity(T entity, Class<T> type) throws RepositoryException {
        openEM();
        EntityTransaction tr = em.getTransaction();

        try {

            tr.begin();
            {
                // entity.weatherdone has value true
                    entity = em.merge(entity);
                // entity.weatherdone has value false
            }
            tr.commit();

        } catch (Exception e) {
            tr.rollback();
        }

        return entity;
    }
    ...
}

JPA 控制台信息：没有错误，也没有警告，甚至没有任何关于应更新布尔列的信息。

--Merge clone with references com.sleepmonitor.persistence.entities.sleep.SleepMeasure@b9025d
...
--Register the existing object  // other objects
...
--Register the existing object com.sleepmonitor.persistence.entities.sleep.SleepMeasure@1ba90cc

那么我该如何解决这个小问题。

注意： Derby 将此字段定义为 "SMALLINT".

谢谢。

Answer 1

天呐！我发现了我的问题。实际上我意识到，它不仅是布尔字段，而且整个对象都无法更新。在尝试完成双向引用时，我愚蠢地在 setter 属性而不是 addMethod() 中执行了此操作。

public void setSleepProperties(SleepProperties sleepProperties) {
    this.sleepProperties = sleepProperties;
    if (!(sleepProperties == null)) {
        this.sleepProperties.setSleepMeasure(this);
    }
}

而不是：

public void addSleepProperties(SleepProperties sleepProperties) {
    this.sleepProperties = sleepProperties;
    if (!(sleepProperties == null)) {
        this.sleepProperties.setSleepMeasure(this);
    }
}

所以我最终在合并前用引用的实体 (sleepProperties.sleepMeasure) 覆盖了拥有实体的更新。这很难找到，我认为从中吸取了很大的教训。感谢所有试图帮助我的人。

"addMethod()" 解决了我的问题。

jpa-derby 布尔合并

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