Validate unique entry on edit/update - php

Question

I'm trying to validate a unique entry when editing/updating a record.
I am validating by searching the database, if the entry is not found then proceed else print an error message. If an entry (I am using this same process when adding new records)
My validation code is:
if (!empty($_POST['ip_add'])) {
if (filter_var($_POST['ip_add'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) === false) {
$errors[] = $_POST['ip_add'] . ' is not a valid IPv4';
} else {
$ip = $_POST['ip_add'];
//check if ip is unique
$qip = 'select INET_NTOA(ip_add) AS ip_add from equipment where ip_add = INET_ATON(:ip)';
$database->query($qip);
$database->bind(':ip', $ip);
$rs = $database->resultset();
//execute our query
$database->execute();
if ($rs != null) {
$errors[] = $_POST['ip_add'] . ' is not unique';
} else {
$ip_add = $_POST['ip_add'];
}
}
} else {
$errors[] = "Please enter a valid IP address";
}
if there are no errors update database:
$query = "
UPDATE equipment
SET site_code = :site_code,
site_id = :site_id,
system_name = :system_name,
ip_add = INET_ATON(:ip_add),
mcast = INET_ATON(:mcast),
sys_loc = :sys_loc,
systype = :systype,
itamname = :itamname,
dimetis = :dimetis,
DNS = :DNS
WHERE id = :id
";
//prepare query for excecution
$database->query($query);
//bind the parameters
$database->bind(':site_code', $site_code);
$database->bind(':site_id', $site_id);
$database->bind(':system_name', $system_name);
$database->bind(':ip_add', $ip_add);
$database->bind(':mcast', $multicast);
$database->bind(':sys_loc', $sys_loc);
$database->bind(':systype', $systype);
$database->bind(':itamname', $itamname);
$database->bind(':dimetis', $_POST['dimetis']);
$database->bind(':DNS', $_POST['DNS']);
$database->bind(':id', $_POST['id']);
// Execute the query
$database->execute();
echo "Record was updated.";
}
}
I was thinking I could search on all records execpt current record that I am currently editing.
How would I do this?
Is there a better way for checking if IP addrss is unique when editing a record?

Answer 1

I got this to work be excluding current record from search:
$qip = '
SELECT
INET_NTOA(ip_add) AS ip_add
FROM equipment
WHERE
ip_add = INET_ATON(:ip)
AND id != :id
';
$database->query($qip);
$database->bind(':ip', $ip);
$database->bind(':id', $id);