ntah lah

//halaman lihatdata.php
mysql_connect("host","user","root");
mysql_select_db("db");
$baca=mysql_query("Select * from siswa");
while($row=mysql_fetch_array($baca))
{
    echo '<a href="editsiswa.php?nis='".$row['nis']."'">Edit</a>';
}

//halaman editsiswa.php
<?php
mysql_connect("host","user","root");
mysql_select_db("db");
if(isset($_GET['nis']))
{
?>
<form action="" method="post">
<?php
$baca=mysql_query("Select * from siswa Where $nis='".$_GET['nis']."'");
$data=mysql_fetch_array($nis);
?>
<input type="text" name="nis" value="<?=$data['nis'];?>">
<input type="text" name="nama" value="<?=$data['nama'];?>">
</form>
<?php
}
?>