How to count rows in a while loop using pdo fetch - php

Question

I was using mysqli_fetch_array and the counting was right until I changed to fetch(), which now only returns the total number of rows instead of returning each number for each row.
So for row one, I want to echo "1", and so on.
NEW NOTE :Everything else inside the while statement is returning correct values, except the counter which returns the total number of rows whereas I want a row number in the order that it was selected from the sql statement.
As requested. This is my connection.
I don't know if i'm suppose to be checking " $e->getMessage();" on every query since I'm using this connection for all my queries.
try {
$dbh = new PDO('mysql:host=localhost;dbname=my_db;charset=utf8', 'usr', 'pwd',
array(PDO::ATTR_EMULATE_PREPARES => false,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION)
);
} catch (PDOException $e){
echo $e->getMessage();
}
This worked
$query = mysqli_query($con, 'SELECT * FROM music');
$count = 0;
while($row = mysqli_fetch_array($query)){
$count++;
echo $count;
}
The new doesn't work.
$query = $dbh->query('SELECT * FROM music');
$count = 0;
while($row = $query->fetch()){
$count++;
echo $count;
}

Answer 1

Works fine, use a try catch do see if your PDO connection is working.
try {
$dbh = new PDO('mysql:host=localhost;dbname=db', 'root', 'root',
array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
} catch (PDOException $e) {
print "Error!: " . $e->getMessage() . "<br/>";
die();
}
$sql = 'SELECT * FROM music';
$sth = $dbh->query($sql);
$count = 0;
while($row = $sth->fetch()){
$count++;
echo $count;
}
I've just tested this and it works fine. Either your PDO connection is incorrect or your query returns no results. I suggest you var_dump($dbh) and see if it returns a PDO object or check that your query is correct. Is your table called music? It is case sensitive.
You also need to change your connection form mysqli to PDO
$mysqli = new mysqli("localhost", "user", "password", "database");
to
$dbh = new PDO('mysql:host=localhost;dbname=database', 'user', 'password');
You can also throw PDO exceptions to see if any are occuring:
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION

Answer 2

$conn->exec("SET CHARACTER SET utf8");
http://coursesweb.net/php-mysql/pdo-select-query-fetch

Answer 3

What about:
if ($pdo){
$query=$pdo->prepare("SELECT count(*) as cnt FROM music");
if($query->execute()){
$count = $query->fetch()[0];//or fetch()['cnt']
echo $count;
}
}

Answer 4

PDO have a little different behavior. This is a replacement for your mysqli.
try {
$dbh = new PDO('mysql:host=localhost;dbname=database', 'user', 'password',array(
PDO::ATTR_EMULATE_PREPARES => false,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
// optional
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
));
$count = 0;
foreach ($dbh->query("SELECT * FROM `music`") as $row) {
$count++;
echo $count;
}
} catch (PDOException $e) {
print "Error!: " . $e->getMessage() . "<br/>";
exit();
}
I hope that helped.

Answer 5

Try using PDO::FETCH_NUM to get the row count directly :-
$countquery = $dbh->query('SELECT COUNT(1) FROM music');
$rowCount = 0;
$rowCount = $countquery ->fetch(PDO::FETCH_NUM);
echo $rowCount;
//And then do another query for the real data if need be
* This makes use of a query to get the row count, and saves you the time taken by the while loop.