String sql = "INSERT INTO pacientes(cod, bairro, paciente, telefone, RG) VALUES(?,?,?,?,?)";
        try {

            PreparedStatement stmt = connection.prepareStatement(sql);
            stmt.setString(1, pac.getCod());
            stmt.setString(2, pac.getBairro());
            stmt.setString(3, pac.getPaciente());
            stmt.setString(4, pac.getTelefone());
            stmt.setString(5, pac.getRG());
            stmt.execute();
            stmt.close();
        } catch (SQLException u) {
            throw new RuntimeException(u);
        }