Untitled

<html>
<head>
<title>Remove Absence for student</title>
</head>
<body>

<h3>Enter the Check In it to mark absence:</h3>

<?php
if(isset($_POST['update']))
{
$dbhost = '####';
$dbuser = '####';
$dbpass = '####';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
  die('Could not connect: ' . mysql_error());
}

$check_in_id = $_POST['check_in_id'];

$sql = "UPDATE check_in SET is_absent=1 WHERE check_in_ID = $check_in_id" ;

///////////////////// mysql_select_db('ENTER DABATABE NAME ');
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
  die('Could not delete data: ' . mysql_error());
}
echo "Asbsence successfully marked for: $check_in_id \n";
mysql_close($conn);
}
else
{
?>
<form method="post" action="<?php $_PHP_SELF ?>">
<table width="400" border="0" cellspacing="1" cellpadding="2">
<tr>
<td width="100">Check in ID</td>
<td><input name="check_in_id" type="number" id="check_in_id"></td>
</tr>
<tr>
<td width="100"> </td>
<td> </td>
</tr>
<tr>
<td width="100"> </td>
<td>
<input name="update" type="submit" id="update" value="Submit">
</td>
</tr>
</table>
</form>
<?php
}
?>
</html>