mysql PDO doesnt work - php

Question

I've a little problem here..
I am using jquery easy UI to get data from mysql and then write a table in my php application..
nah.. the problem is.. my code or my query doesn't work..
When I am using my old mysql_connect, my code works well... but when I try to write it to mysql, I get nothing...
Here is my old code:
$page = isset($_POST['page']) ? intval($_POST['page']) : 1;
$rows = isset($_POST['rows']) ? intval($_POST['rows']) : 10;
$offset = ($page-1)*$rows;
$result = array();
$conn = mysql_connect('127.0.0.1','root','');
mysql_select_db('colosus',$conn);
$rs = mysql_query("select count(*) from user");
$row = mysql_fetch_row($rs);
$result["total"] = $row[0];
$rs = mysql_query("select * from user limit $offset,$rows");
$rows = array();
while($row = mysql_fetch_object($rs)){
array_push($rows, $row);
}
$result["rows"] = $rows;
echo json_encode($result);
and its the PDO query code...
$page = isset($_POST['page']) ? intval($_POST['page']) : 1;
$rows = isset($_POST['rows']) ? intval($_POST['rows']) : 10;
$offset = ($page-1)*$rows;
$result = array();
$rs = $db->query("select count(*) from user");
$row = $rs->fetch(PDO::FETCH_NUM);
$result["total"] = $row[0];
$rs = $db->query("select * from user as u, leveluser as l where u.idLevelUser = l.idLevelUser limit $offset,$rows");
$rows = array();
while($row = $rs->fetch(PDO::FETCH_OBJ)){
array_push($rows, $row);
}
$result["rows"] = $rows;
echo json_encode($result);
The last query (PDO) doesn't work.. I dont know why.. anybody can help me???

Answer 1

Looks like you forget to instanciate your $db object.
Try to put this before $result = array();
$db = new PDO("mysql:host=127.0.0.1;dbname=colosus", 'root', '');

Answer 2

create the pdo connection like
$db = new PDO('mysql:host=localhost;dbname=testdb;charset=UTF-8',
'username',
'password',
array(PDO::ATTR_EMULATE_PREPARES => false,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION)
);
try query like
$query= $db->prepare("select * from user as u,
leveluser as l
where u.idLevelUser = l.idLevelUser
limit $offset,$rows");
$query->execute();
$result=$articlequery->fetch(pdo::FETCH_ASSOC);