Android - สอบถามเรื่องการ Query ข้อมูลจาก SQLite ในการหาค่าของสถานที่ใกล้เคียงเราครับ

// Show graph Data
	public ArrayList<HashMap<String, String>> SelectGraphnearmeData(String lat,
			String lng) {
		// TODO Auto-generated method stub

		try {

			ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String, String>>();
			HashMap<String, String> map;

			SQLiteDatabase db;
			db = this.getReadableDatabase(); // Read Data

			Cursor cursor = db
					.rawQuery(
							"SELECT *, ( 3959 * acos( cos( radians('"
									+ lat
									+ "') ) * cos( radians( a.latitude ) ) * cos( radians( a.longitude ) - radians('"
									+ lng
									+ "') ) + sin( radians('"
									+ lat
									+ "') ) * sin( radians( a.latitude ) ) ) ) AS distanceFROM  staion AS a HAVING distance < 1000 ORDER BY distance",
							null);

			if (cursor != null) {
				if (cursor.moveToFirst()) {
					do {

						map = new HashMap<String, String>();
						map.put("id", cursor.getString(0));
						map.put("stationid", cursor.getString(1));
						map.put("gaslog", cursor.getString(5));
						map.put("protolog", cursor.getString(6));
						map.put("ipelog", cursor.getString(7));
						map.put("log_date_length", cursor.getString(20));
						map.put("log_date", cursor.getString(21));

						MyArrList.add(map);
					} while (cursor.moveToNext());
				}
			}
			cursor.close();
			db.close();
			return MyArrList;

		} catch (Exception e) {
			return null;
		}

	}