java executeQuery()查询的有关问题

Connection con = GolbalDbInfo1.getConnection();        String sql = "select count(*) from RFM_Portal_Product where spicture is not null";        try {            Statement stmt = con.createStatement();            ResultSet rs = stmt.executeQuery(sql);            rs.next();            System.out.println(rs.getString(1));        } catch (SQLException e) {            e.printStackTrace();        }