Select 从 sqlite 订购的数据

Question

我正在尝试获取按列排序的数据，但它不起作用。知道为什么吗？

public ArrayList<HashMap<String, String>> getMonthData(String month,String year, String name){
    ArrayList<HashMap<String,String>> activityArrayList = new ArrayList<HashMap<String,String>>();
    String selectQuery = "SELECT * FROM activity WHERE year='"+year+"' AND month='"+month+"' AND name=? ORDER BY day ASC";
    SQLiteDatabase database = this.getWritableDatabase();
    Cursor cursor = database.rawQuery(selectQuery,new String[] { name });
    if(cursor.moveToFirst()){
        do{
            HashMap<String, String> activityMap = new HashMap<String,String>();
            activityMap.put("day",cursor.getString(2).toString());

            activityArrayList.add(activityMap);
        }while(cursor.moveToNext());
    }
    return  activityArrayList;
}

Answer 1

解决方案是我将日期存储为文本，因此它是按字典顺序排列的。所以我必须把它变成真实的。使用 "CAST(day AS REAL)"。

Select 从 sqlite 订购的数据

Select data that is ordered from sqlite

android

android-sqlite