DefaultTableModel model = (DefaultTableModel) ordertable.getModel();
try{
    Class.forName("java.sql.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/loginform","root","admin");
Statement stmt = con.createStatement();
String query = "SELECT * from neworder;";
ResultSet rs = stmt.executeQuery(query) ;
while(rs.next()){
model.addRow(new Object [] {
    rs.getString(1), rs.getInt(2), rs.getString(3), rs.getString(4), rs.getString(5)
}
);

}
rs.close();
stmt.close();

}