public String getNumOfOximata(){
		/*
		 * epistefei ton arithmo twn oximatwn ths vashs
		 */
		String num=null;
		try {
			pS = conn.prepareStatement("SELECT COUNT(*) AS num FROM oximata");
			rs=pS.executeQuery();
			while(rs.next()){
				num=rs.getString("num");
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return num;
	}