mysql_num_rows with PDO

Crispijn — Fri, 06 Mar 2009 09:12:37 +0000

I’ve switched a couple of years ago to PDO to manage all the database actions. PDO (PHP Data Objects) is an object orientated extension that requires at least php 5.1. In many cases software improves and is often more easy to use. But why did the php development-team forgot to write a similar function like mysql_num_rows?

In this case you always need to run an extra query to retrieve the total records. See the examples below.

Old style

$sql = "SELECT id, name FROM table WHERE cat = 1";
$res = mysql_query($sql);
$count = mysql_num_rows($res);

Read more about the basic error handler in a previous article.

PDO style

try{
	$sql = "SELECT COUNT(id), name FROM table WHERE cat = 1";
	$res = $this->db->prepare($sql);
	$res->execute();

	//count the rows
	$count = $res->fetchColumn();
}catch(PDOException $e){
	//Basic error handler
	return $e->getMessage();
	return $sql;
}

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mysql_num_rows with PDO

Old style

PDO style