android - 想要从数据库中检索给定日期范围内的值

Question

我想通过以下方式获取值：

我想获取当前周数的总值，我的代码在这里：

SimpleDateFormat weekDateFormat = new SimpleDateFormat("dd/MM/yyyy");
Calendar c = Calendar.getInstance();
c.set(Calendar.DAY_OF_WEEK, 1);
Date weekFirstDate = c.getTime();
String strWeekFirstDay = weekDateFormat.format(weekFirstDate);
Cursor weekCursor = database.rawQuery("select sum(cat_attribute_unit) from counter where cat_id ="+cat_id+" AND counter_entry_date BETWEEN '"+strWeekFirstDay+"' AND '"+todays_date+"';", null);
int weekCounter = 0;
if(weekCursor.moveToFirst())
    weekCounter = weekCursor.getInt(0);
else
    weekCounter = 0;
weekCursor.close();

这是获取当前月份总计数的代码：

SimpleDateFormat monthDateFormat = new SimpleDateFormat("dd/MM/yyyy");
    Calendar c2 = Calendar.getInstance();
    c2.set(Calendar.DAY_OF_MONTH, 1);
    Date monthFirstDate = c2.getTime();
    String strMonthFirstDay = monthDateFormat.format(monthFirstDate);

    Cursor monthCursor = database.rawQuery("select sum(cat_attribute_unit) from counter where cat_id ="+cat_id+" AND counter_entry_date BETWEEN '"+strMonthFirstDay+"' AND '"+todays_date+"';", null);
    int monthCounter = 0;
    if(monthCursor.moveToFirst())
        monthCounter = monthCursor.getInt(0);
    else
        monthCounter = 0;
    monthCursor.close()

这个对吗 ？？因为它不能正常工作，意味着我得到了错误的值。我也想让我的一周从星期一开始。有人会更正我的代码或建议一些新代码吗？

Answer 1

以这种格式存储所有日期，然后重试..

MM-dd-yyyy

Cursor monthCursor = database.rawQuery("select sum(cat_attribute_unit) from counter where cat_id ="+cat_id+" AND counter_entry_date BETWEEN '"+strMonthFirstDay+"' AND '"+todays_date+"';", null);