try {
      val statement = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY)
      val rs = statement.executeQuery(query)
      while (rs.next) {
        result += (rs.getString("uid") -> new Vector(Array(rs.getDouble("ratio"))))
      }
    }
    finally {
      conn.close()
    }