@SuppressWarnings({ "rawtypes", "unchecked" })
  public void getAllInGroup(String group, Map target){
    try{
      String key;
      ObjectInputStream objStr;
      Serializable obj;
      
      PreparedStatement prep = this.conn.prepareStatement("SELECT key, value FROM keyval WHERE collection = ?");
      prep.setString(1, group);
      ResultSet rs = prep.executeQuery(); 
      while(rs.next()){
        key = rs.getString(1);
        objStr = new ObjectInputStream(new ByteArrayInputStream(rs.getBytes(2)));
        obj = (Serializable)objStr.readObject();
        target.put(key, obj);
      }
      rs.close();
    }catch(Exception e){
      e.printStackTrace();
    }
  }