PHP MYSQL Update query - php

Question

I currently have the following update statement but is there anyway that I can make it retain the current values but insert and new values that are not in the db?
If not what would be the best way to achieve this?
UPDATE INTO {refocus_candidate_category} SET canid=?, categoryid=? WHERE canid=? AND categoryid=?",array($emailCheck['id'], $id, $emailCheck['id'], $id));
Function:
$catParams = array_merge(array($emailCheck['id']), $fields['Occupation']);
$catPlaceholders = '?'.str_repeat(',?',count($fields['Occupation'])-1);
$catCheck = CMS::selectQuery("SELECT * FROM {table} WHERE canid=? AND categoryid IN (".$catPlaceholders.")", $catParams);
if($catCheck != FALSE)
{
for($i=0; $i<count($fields['Occupation']); $i++) {
$id = $fields['Occupation'][$i];
CMS::updateQuery("UPDATE INTO {table} SET canid=?, categoryid=? WHERE canid=? AND categoryid=?",array($emailCheck['id'], $id, $emailCheck['id'], $id));
}
echo 'found update';
}
ID Print
$fields['Occupation'][$i] = 1678

Answer 1

It's not clear to me from your question precisely what you mean, but there are a number of alternatives for inserts/updates that deal with missing or already present values.
Firstly, if you just want to insert into mysql and have it either create a new row or replace an existing row (where existing is determined by the primary key matching) use REPLACE INTO instead of INSERT INTO. REPLACE INTO tries an insert, but if the primary key already exists, it turns the query into a DELETE and then retries the INSERT.
If you want to insert a new row but leave an existing row alone if you've already got one, you can either use INSERT IGNORE INTO (which may also fail to insert if you've got your data types or column info wrong...) or INSERT INTO ... ON DUPLICATE KEY UPDATE which allows you to do much finer grained control of how you handle inserts of items that already exist.
There's other options as well, but those are probably the most relevant.