This tutorial will teach Online Payment System using Java Mysql step by step.
First enter cardno if the cardno is correct it will allow you to enter the amount
public void keyPressed(KeyEvent arg0) { if(arg0.getKeyCode() == KeyEvent.VK_ENTER) { String accno = txtcardno.getText(); try { Class.forName("com.mysql.jdbc.Driver"); con = DriverManager.getConnection("jdbc:mysql://localhost/card","root",""); pst = con.prepareStatement("select * from details where cardno = ?"); pst.setString(1, accno); ResultSet rs; rs = pst.executeQuery(); if(rs.next() == false) { JOptionPane.showMessageDialog(null,"Card No no found"); } else { txtamt.requestFocus(); } } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } } }
try { Class.forName("com.mysql.jdbc.Driver"); con = DriverManager.getConnection("jdbc:mysql://localhost/card","root",""); String sqlupdate= "update details set amount= amount- ? where cardno=? "; pst=con.prepareStatement(sqlupdate); pst.setString(1,txtamt.getText()); pst.setString(2,txtcardno.getText()); pst.executeUpdate(); JOptionPane.showMessageDialog(null,"Paid...!!!!"); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); }
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