Yang ini ini coding Ubahnya,,,
Coba aja dulu smoga berhasil yah ...:::
<?php
$koneksi=mysqli_connect("localhost","root","","dbrumahsakit");
$a="select * from obat where kode_obat='$_GET[kode_obat]'";
$b=mysqli_query($koneksi,$a);
$c=mysqli_fetch_array($b);
if (isset($_POST['ubah'])) {
$nama_obat=$_POST['nama_obat'];
$dosis=$_POST['dosis'];
$harga=$_POST['harga'];
$jenis_obat=$_POST['jenis_obat'];
$keterangan=$_POST['keterangan'];
$berlaku=$_POST['berlaku'];
//query ubah
$x="update obat set nama_obat='$nama_obat',dosis='$dosis',harga='$harga',jenis_obat='$jenis_obat',
keterangan='$keterangan',berlaku='$berlaku' where kode_obat='$_GET[kode_obat]'";
$y=mysqli_query($koneksi,$x);
if ($y){
echo " Data Berhasil Diubah <br>
<a href='dataobat.php'>Lihat Data</a>";
}else{
echo "Data Gagal Di Ubah";
}
}
?>
<p align="center" > <a href='dataobat.php'> Tampil Data </a></p>;
<h2 align="center">Ubah Data Obat RS. SEjahtera </h2>
<form method="POST" action="">
<table border="0" cellpadding="1" cellspacing="0"
align="center" width="50%">
<tr >
<td> Kode Obat </td>
<td><?php echo $c['kode_obat']; ?></td>
</tr>
<tr >
<td> Nama Obat </td>
<td><input type="text" name ="nama_obat" size="30" value="<?php echo $c['nama_obat']; ?>"></td>
</tr>
<tr >
<td> Dosis</td>
<td><input type="text" name ="dosis" size="15" value="<?php echo $c['dosis']; ?>"></td>
</tr>
<tr >
<td> Harga </td>
<td><input type="text" name ="harga" size="12" value="<?php echo $c['harga']; ?>"></td>
</tr>
<tr>
<td>Jenis Obat</td>
<td> <select name="program_studi">
<option Value="Sirup" <?php if($c['jenis_obat']=="Sirup"){ echo "selected";} ?>>Sirup</option>
<option Value="kapsul" <?php if($c['jenis_obat']=="Kapsul"){ echo "selected";} ?>>Kapsul</option>
</select>
</td>
</tr>
<tr>
<td> Keterangan </td>
<td> <textarea name="keterangan" cols="35" rows="4"><?php echo $c['keterangan']; ?></textarea></td>
</tr>
<tr>
<td>Berlaku</td>
<td>
<input type="radio" name="berlaku" value="Masih berlaku" <?php if($c['berlaku']=="Masih berlaku"){ echo "checked";} ?>>Masih Berlaku
<input type="radio" name="berlaku" value="Kadaluarsa" <?php if($c['berlaku']=="Kadaluarsa"){ echo "checked";} ?>>Kadaluarsa</td>
</tr>
<tr >
<td> </td>
<td>
<input type="submit" name="ubah" value="UBAH">
<input type="submit" name="batal" value="BATAL">
</td>
</tr>
</table>
</form>
"Semoga Bermanfaat ^_^