Nomor 1

<?php

  $query = $koneksi->query("SELECT * FROM barang");

 $i = 1;

?>

<h1>Tampil Data Barang</h1>

<table border=1>

 <tr>

  <td>No</td>

  <td>Kode Barang</td>

  <td>Nama Barang</td>

  <td>Harga</td>

  <td>Aksi</td>

 </tr> <?php

 while ($data = $query->fetch_array())

 {

  $kode = $data['KdBrg'];

  echo "

  <tr>

   <td>" . $i++ . "</td>

   <td>" . $data['KdBrg'] . "</td>

   <td>" . $data['NmBrg'] . "</td>

   <td>Rp." . number_format($data['Harga'],0,",",".") . ",-</td>

   <td><a href='index.php?hal=ubah.php&kode=$kode'>Ubah</a> | <a href='index.php?hal=hapus.php&kode=$kode'>Hapus</a> </td>

  </tr>";

 } ?>

</table>

<?php

  $kode = $_GET["kode"];

 $query = $koneksi->query("SELECT * FROM barang WHERE KdBrg LIKE '$kode'");

 $data = $query->fetch_array()

?>

<form method="POST">

 <h1>Ubah Data Barang</h1>

 <table>

  <tr>

   <td>Kode Barang :</td>

   <td><input type="text" name="txtKd" value="<?php echo $data['KdBrg']; ?>"></td>

  </tr>

  <tr>

   <td>Nama Barang :</td>

   <td><input type="text" name="txtNm" value="<?php echo $data['NmBrg']; ?>"></td>

  </tr>

  <tr>

   <td>Harga :</td>

   <td><input type="text" name="txtHr" onkeyup="this.value=this.value.replace(/[^\d]/,'')" value="<?php echo $data['Harga']; ?>"></td>

  </tr>

  <tr>

   <td colspan="2">

    <input type="submit" value="Ubah" name="btnUbah">

   </td>

  </tr>

 </table>

</form>

<?php

 if (isset($_POST["btnUbah"]))

 {

  #tampung ke variabel yang isian dari form

  $kode = $_POST["txtKd"];

  $nama = $_POST["txtNm"];

  $harga = $_POST["txtHr"];

  #coba cek ada gak isinya

  echo $kode . $nama . $harga;

  $query = $koneksi->query("UPDATE barang SET NmBrg='$nama', Harga='$harga' WHERE KdBrg='$kode' ");

 } #akhir tombol simpan diklik

?>