PDO equivalent of mysql_num_rows or mssql_num_rows [duplicate]

Answer 1

If you want to count the rows you can do this with PDO:

$sql = 'select * from users';
$data = $conn->query($sql);
$rows = $data->fetchAll();
$num_rows = count($rows);

There is no way to directly count rows when using a SELECT statement with PDO as stated in the docs.

PDOStatement::rowCount() returns the number of rows affected by the last DELETE, INSERT, or UPDATE statement executed by the corresponding PDOStatement object.

Only do a row count if you absolutely need the count, otherwise you can verify that the query worked with other methods. You should also not use this method if you expect to be returning thousands of rows from a table, instead, use the COUNT() function in a query for just performing the count.

Answer 2

So with everyone's help this is what I built.

function getRowsAffected() {

    $rawStatement = explode(" ", $this->query);
    $statement = strtoupper($rawStatement[0]);

    if ($statement == 'SELECT' || $statement == 'SHOW') {

        $countQuery = preg_replace('/(SELECT|SHOW)(.*)FROM/i', "SELECT count(*) FROM", $this->query);
        $countsth = $this->pdo->prepare($countQuery);

        if ($countsth->execute()) {
            $this->rowsaffected = $countsth->fetchColumn();
        } else {
            $this->rowsaffected = 0;
        }
    }

    return $this->rowsaffected;
}

$this->rowsaffected is already being updated in the execute phase if the statement is an INSERT, UPDATE, or DELETE with $sth->rowCount() so I only needed to run this second query on SELECT and SHOWS.

if ($statement == 'INSERT' ||  $statement == 'UPDATE' || $statement == 'DELETE') {
    $this->rowsaffected = $this->sth->rowCount();
}

I feel bad though, because just as I mentioned in my question, that I was looking for an overall solution I seem to have stumbled onto a specific solution that works for me since the code already asks for the number of rows using a function. If the code was doing this:

if (mysql_num_rows($result) > 0) {

then this solution would still create work updating all instances to use that custom function.