---index.php---
<form name="fsimpan" method="post" action="simpan.php">
kode lama :<input type="text" name="kode_lama" size="5">
kode baru :<input type="text" name="kode_baru" size="5">
nama :<input type="text" name="nama" size="100">
alamat :<input type="text" name="alamat" size="100">
<input type="submit" value="simpan">
</form>
---simpan.php----
<?
$koneksi=mysql_connect("host","user","password") or die("koneksi gagal");
mysql_select_db($koneksi,"database")or die ("database tidak ada");
$qry_baru=mysql_query("INSERT INTO buku_tamu VALUES('$_POST[kode_baru]','$_POST[nama]','$_POST[alamat]'")");
$qry_lama=mysql_query("UPDATE buku_tamu SET nama='$_POST[nama]',alamat='$_POST[alamat]' WHERE kode='$_POST[kode_lama]'");
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