使用Hibernate的SQL服务器的java.sql.Timestamp持久性不一致

Question

我的程序使用名为“Measurement Time”的DATETIME字段查询SQL数据库，下面是我的模型对象中的相关代码。我正在使用休眠。

private Timestamp measurementTime;

@Basic
@Column(name = "`Measurement Time`")
public Timestamp getMeasurementTime() {
    return measurementTime;
}

public void setMeasurementTime(Timestamp measurementTime) {
    this.measurementTime = measurementTime;
}
}

我在列表中选择了大约300,000行。当循环它们并按日期打印日期时：

System.out.println(obj.getMeasurementTime());

我得到了很多相同的日期时间，也许95％的日期时间是相同的。这与数据集不匹配。

我想知道这里可能出现什么问题，因为它似乎没有意义。持久性？驱动程序hibernate正在使用？

private List<ResultsEntity> getResults(){

    Integer days ago = 365;

    Calendar cal = Calendar.getInstance();
    cal.add(Calendar.DAY_OF_YEAR, - days_ago);

    Timestamp oneYearAgo =  new Timestamp(cal.getTimeInMillis());

    System.out.println(days_ago + " days ago: "+ oneYearAgo);

    List<ResultsEntity> ResultsEntityArrayList = new ArrayList<>();

    DatabaseHelper databaseHelper = new DatabaseHelper();

    Session session = databaseHelper.getSession();

    Query query;

    try{
        query = session.createQuery(" from ResultsEntity where measurementTime > :time " +
                "and transmissionStatus != :status " +
                "and analyte like :analyteFilter and unit = :unit");
        query.setParameter("time", oneYearAgo);
        query.setParameter("status", "error");
        query.setParameter("analyteFilter","Gel%");
        query.setParameter("unit","m/L");

        ResultsEntityArrayList = query.list();
    }catch (Exception e){
        System.out.println(e);
    }
    finally {
        session.close();
    }

    return ResultsEntityArrayList;
}