Update record using PHP

<?php
$a=$_POST['i'];
//echo "$a";
$b=$_POST['n'];
//echo "$b";
$c=$_POST['p'];
//echo "$c";
$d=$_POST['e'];
//echo "$d";
$con=mysql_connect("localhost","root","root");
if(!con)
{
die("could not connect".mysql_error());
}
$sql="update department set name='".$b."',password='".$c."',emailid='".$d."' where id='".$a."'";
mysql_select_db('naveen',$con);
$ok=mysql_query($sql);
if(!ok)
{
die("could not updated".mysql_error());
}
else
{
echo "data is successfully updated";
echo "<a href='view.php'>view</a>";
}

?>

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