public void insert(Client client) throws SQLException {
   String firstName = client.getFitstName();
   String secondName = client.getSecondName();
   String email = client.getEmail();
   PreparedStatement ps =
       OracleConnection.getConnection().prepareStatement("INSERT into Client VALUES ? ,? ,? ");
   ps.setString(1, firstName);
   ps.setString(2, secondName);
   ps.setString(3, email);
   ps.executeQuery();
 }