Update query in php correct layout - php

Question

I am having a problem with a update query, I believe I have done this right but have not done it before and its not working so I have gone wrong somewhere but do not know where.
any help will be fantastic.
admin.php
$result = mysql_query("SELECT * FROM bands ");
echo "</br>";
echo "<table border = '1'>
<tr>
<th>Show No</th>
<th>Band Name</th>
<th>Venue</th>
<th>Category</th>
<th>Stock</th>
<th>Edit Show</th>
</tr>";
while($row = mysql_fetch_array($result))
{
echo "<td>" .$row['Band_id']. "</td>";
echo "<td>" .$row['Name']. "</td>";
echo "<td>" .$row['Venue']. "</td>";
echo "<td>" .$row['Category']. "</td>";
echo "<td>" .$row['Stock']. "</td>";
echo ("<td>Edit</td></tr>");
}
echo "</table>";
?>
editband.php
<?php
require 'core/init.php';
$result = mysql_query("SELECT * FROM bands where Band_id ='$Band_id'");
$row = mysql_fetch_array($result);
?>
<form method="post" action="ammenddetails.php">
<input type="hidden" name="id" value="<? echo "$row[Band_id]"?>">
<tr>
<td>Band Name</td>
<td>
<input type="text" name="Name"
size="20" value="<? echo "$row[Name]"?>">
</td>
</tr>
<tr>
<td>Venue</td>
<td>
<input type="text" name="Venue" size="20"
value="<? echo "$row[Venue]"?>">
</td>
</tr>
<tr>
<input type="submit"
name="submit value" value="Edit">
</td>
</tr>
</form>
?>
ammenddetails.php
<?php
require 'core/init.php';
$result = mysql_query("UPDATE bands
SET Name='$Name',
Venue='$Venue'
WHERE
Band_id='$Band_id'");
mysql_query($result);
header("location:admin.php");
?>

Answer 1

Your ammenddetails.php is missing the POST values
Should be as below-
require 'core/init.php';
$Name = mysql_real_escape_string($_POST["Name"]);
$Venue = mysql_real_escape_string($_POST["Venue"]);
$Band_id = (int)$_POST["id"];
$result = mysql_query("UPDATE bands
SET Name='$Name',
Venue='$Venue'
WHERE
Band_id='$Band_id'");
mysql_query($result);
header("location:admin.php");

Answer 2

require 'core/init.php';
$Name = mysql_real_escape_string($_POST["Name"]);
$Venue = mysql_real_escape_string($_POST["Venue"]);
$Band_id = (int)$_POST["id"];
$query= "UPDATE bands
SET Name='$Name',
Venue='$Venue'
WHERE
Band_id='$Band_id'";
mysql_query($query);
header("location:admin.php");
Try that? You should only need to run the mysql_query function once. Build the query string into a variable and run that variable on the mysql_query function