PDO - check if row was updated?

Question

Other people have asked this question, but mine is a little more specific.

I have this query:

$sql = "UPDATE table SET option=? WHERE number=?";
$q = $conn->prepare($sql);
$q->execute(array($option, $number));
$q->setFetchMode(PDO::FETCH_BOTH);

echo $q->rowCount();

If the WHERE number already exists and the SET option is same, $q->rowCount() equals 0

If the WHERE number doesnt exist and the row does not update, $q->rowCount() equals 0

How can I distinguish between these non-updates?

Answer 1

On recent PHP versions, it's controlled by the PDO::MYSQL_ATTR_FOUND_ROWS attribute. When set to true , according to the doc , the effect is:

 Return the number of found (matched) rows, not the number of changed rows.

Answer 2

You can try using REPLACE which work's like insert but if the row already exists its first deleted and then inserted. This has overwork from mysql side

Answer 3

Will be better check before if exists? I use a common function for this in my miniclass for manage PDO, but i dont know if is the best solution because make one query more...

function checkExistsInDatabase($id, $table, $where = null){

    // Connect
    $Database = Database::connect();

    // Query
    $sql = "SELECT id 
            FROM $table
            WHERE id = :id $where
            LIMIT 1";
    $params = array(
                ':id' => array(
                    'value' => $id,
                    'type' => 'int'
                )
              );
    $q = $Database->query($sql, $params);

    // Ha encontrado algo?
    $resultados = $Database->fetchArray($q);
    if(count($resultados) === 1){
        return true;
    }else{
        return false;
    }

}

Answer 4

Add this:

$db = new PDO($dsn, $username, $password, array(PDO::MYSQL_ATTR_FOUND_ROWS => true));

to the first "try {" part of your databasefunctions.php file