String s8 = tfPassword.getText();

MessageDigest md = MessageDigest.getInstance("MD5");
                        md.update(s8.getBytes());
                        byte [] byteData = md.digest();

                        StringBuilder sb = new StringBuilder(32);
                        for (byte b : byteData) {
                            sb.append(String.format("%02x", b & 0xff));
                        }

Statement st = con.createStatement();

st.executeUpdate("insert into Login (StaffID, UName, PWord, Staff) values('"+StaffID+"','"+s7+"','"+sb+"','Yes')");

String s2 = tfPassword.getText();

                    MessageDigest md = MessageDigest.getInstance("MD5");
                    md.update(s2.getBytes());
                    byte [] byteData = md.digest();

                    StringBuilder sb = new StringBuilder(32);
                    for (byte b : byteData) {
                        sb.append(String.format("%02x", b & 0xff));
                    }

                    Statement st = con.createStatement();


                    // SQL Statements
                    st.executeQuery("SELECT * FROM login WHERE UName= '"+s1+"' and PWord = '"+sb+"'");