0
一个开始日期和结束日期之间的日期属性我想编写一个函数来得到Entry对象，它们的date场是beginPeriod和endPeriod我张贴下面的代码片段与一个黑客的作品之间的列表。我必须从开始时间日期减去一天。看起来条件很好或平等不起作用。筛选与JDOQL
任何想法为什么我有这个问题？
public static List<Entry> getEntries(Date beginPeriod, Date endPeriod) {
/* TODO
* The great or equal condition does not seem to work in the filter below
* Substract a day and it seems to work
*/
Calendar calendar = Calendar.getInstance();
calendar.set(beginPeriod.getYear(), beginPeriod.getMonth(), beginPeriod.getDate() - 1);
beginPeriod = calendar.getTime();
PersistenceManager pm = JdoUtil.getPm();
Query q = pm.newQuery(Entry.class);
q.setFilter("this.date >= beginPeriodParam && this.date <= endPeriodParam");
q.declareParameters("java.util.Date beginPeriodParam, java.util.Date endPeriodParam");
List<Entry> entries = (List<Entry>) q.execute(beginPeriod,endPeriod);
return entries;
}