Row count with PDO

Question

There are many conflicting statements around. What is the best way to get the row count using PDO in PHP? Before using PDO, I just simply used mysql_num_rows.

Answer 1

fetchColumn()

used if want to get count of record [effisien]

$sql   = "SELECT COUNT(*) FROM fruit WHERE calories > 100";
$res   = $conn->query($sql);
$count = $res->fetchColumn(); // ex = 2

query()

used if want to retrieve data and count of record [options]

$sql = "SELECT * FROM fruit WHERE calories > 100";
$res = $conn->query($sql);

if ( $res->rowCount() > 0) {

    foreach ( $res as $row ) {
        print "Name: {$row['NAME']} <br />";
    }

}
else {
    print "No rows matched the query.";
}

PDOStatement::rowCount

Answer 2

As I wrote previously in an answer to a similar question, the only reason mysql_num_rows() worked is because it was internally fetching all the rows to give you that information, even if it didn't seem like it to you.

So in PDO, your options are:

1. Use PDO's fetchAll() function to fetch all the rows into an array, then use count() on it.
2. Do an extra query to SELECT COUNT(*), as karim79 suggested.
3. Use MySQL's FOUND_ROWS() function UNLESS the query had SQL_CALC_FOUND_ROWS or a LIMIT clause (in which case the number of rows that were returned by the query and the number returned by FOUND_ROWS() may differ). However, this function is deprecated and will be removed in the future.

Answer 3

This is super late, but I ran into the problem and I do this:

function countAll($table){
   $dbh = dbConnect();
   $sql = "select * from `$table`";

   $stmt = $dbh->prepare($sql);
    try { $stmt->execute();}
    catch(PDOException $e){echo $e->getMessage();}

return $stmt->rowCount();

It's really simple, and easy. :)

Answer 4

I tried $count = $stmt->rowCount(); with Oracle 11.2 and it did not work. I decided to used a for loop as show below.

   $count =  "";
    $stmt =  $conn->prepare($sql);
    $stmt->execute();
   echo "<table border='1'>\n";
   while($row = $stmt->fetch(PDO::FETCH_OBJ)) {
        $count++;
        echo "<tr>\n";
    foreach ($row as $item) {
    echo "<td class='td2'>".($item !== null ? htmlentities($item, ENT_QUOTES):"&nbsp;")."</td>\n";
        } //foreach ends
        }// while ends
        echo "</table>\n";
       //echo " no of rows : ". oci_num_rows($stmt);
       //equivalent in pdo::prepare statement
       echo "no.of rows :".$count;

Answer 5

I ended up using this:

$result = $db->query($query)->fetchAll();

if (count($result) > 0) {
    foreach ($result as $row) {
        echo $row['blah'] . '<br />';
    }
} else {
    echo "<p>Nothing matched your query.</p>";
}

Answer 6

when you make a COUNT(*) in your mysql statement like in

$q = $db->query("SELECT COUNT(*) FROM ...");

your mysql query is already counting the number of result why counting again in php? to get the result of your mysql

$q = $db->query("SELECT COUNT(*) as counted FROM ...");
$nb = $q->fetch(PDO::FETCH_OBJ);
$nb = $nb->counted;

and $nb will contain the integer you have counted with your mysql statement a bit long to write but fast to execute

Edit: sorry for the wrong post but as some example show query with count in, I was suggesting using the mysql result, but if you don't use the count in sql fetchAll() is efficient, if you save the result in a variable you won't loose a line.

$data = $dbh->query("SELECT * FROM ...");
$table = $data->fetchAll(PDO::FETCH_OBJ);

count($table) will return the number of row and you can still use the result after like $row = $table[0] or using a foreach

foreach($table as $row){
  print $row->id;
}