Echo last 10 results of mysql database using pdo - php

Question

I'm trying to echo the last 10 items in my database with pdo. However I keep getting Query failed. However when I do the code snippet at the very bottom I can get just the very last item in my database.
$db2 = new PDO('mysql:host='. $host .';dbname='.$db_name_uroll, $db_username, $db_password);
$statement2 = $db2->prepare("select * from `{$user}` ORDER BY bet_id DESC LIMIT 2");
if ($stmt = $db2->query($statement2)) //PDO::query() returns a PDOStatement on success or false on failure.
{
//If we got a PDOStatement as a return value from PDO::Query() !!!ECHO WHILE FETCHING!!!
while($row2 = $stmt->fetch(PDO::FETCH_ASSOC)) //This loop will keep going for as many rows as the PDOStatement returns.
{
echo $row2['roll'] . "<br />";
}
}
else
{
//If PDO::Query returned false, then something is wrong with our query. Or connection or whatever.
echo "Query failed.";
}
But when I do this below it works, but only prints out the very last item
$row2 = $statement2->fetch();
echo $row2[roll];

Answer 1

You need to remove prepare statement. and run query directly inside query function.
$db2 = new PDO('mysql:host='. $host .';dbname='.$db_name_uroll, $db_username, $db_password);
//Remove $db2 prepare
$statement2 = "select * from `{$user}` ORDER BY bet_id DESC LIMIT 2";
if ($stmt = $db2->query($statement2)) //PDO::query() returns a PDOStatement on success or false on failure.
{
//If we got a PDOStatement as a return value from PDO::Query() !!!ECHO WHILE FETCHING!!!
while($row2 = $stmt->fetch(PDO::FETCH_ASSOC)) //This loop will keep going for as many rows as the PDOStatement returns.
{
echo $row2['roll'] . "<br />";
}
}
else
{
//If PDO::Query returned false, then something is wrong with our query. Or connection or whatever.
echo "Query failed.";
}
This code is working.
Docs link: http://www.php.net/pdo.query
Using prepare you have to use execute method.
http://www.php.net/manual/en/pdo.prepare.php

Answer 2

this is tested code.
$dbhost = "localhost";
$dbname = "pdo";
$dbuser = "root";
$con = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbuser);
echo $select = "SELECT * FROM books ORDER BY id DESC LIMIT 10";
$query = $con->prepare($select);
$query->execute();
$query->setFetchMode(PDO::FETCH_BOTH);
while($row = $query->fetch()) {
echo '<pre>';print_r($row);echo '</pre>';
}
or you can do like this
if($query->execute()) {
$query->setFetchMode(PDO::FETCH_BOTH);
while($row = $query->fetch()) {
echo '<pre>';print_r($row);echo '</pre>';
}
} else {
echo "Query failed";
}