PDO:: What's wrong with this query? - php

Question

Method in my class does it work properly. Don't give me some error message, but simply does not work.
public function query($value)
{
$this->__error = FALSE;
$sql = "SELECT * FROM users WHERE username = ".Input::input($value);
if ($this->__query = $this->__pdo->query($sql))
{
$this->__result = $this->__query->fetchAll(PDO::FETCH_OBJ);
$this->__count = $this->__query->rowCount(); //Here is the problem
}
else {
$this->__error = TRUE;
}
return $this;
}
public function count()
{
return $this->__count;
}
But I would not write whole class code, I mention that PDO DataBase connection is properly defined ($_pdo property), also the instance who is responsible to comunicate with database. ($_instance property). Input class too.
Here is my index.php (some kind of registration form):
<?php
spl_autoload_register(function($class) //Load all class in project
{
require_once 'class/'.$class.'.php';
}
);
$user = DataBase_class::instance()->query("username"); //username is the name of textbox
if ($user->count())
{
echo 'User exist';
}
else echo 'User not exist';
?>
Result is "User not exist", although user exist 100%.

Answer 1

You forget the quotes
$sql = "SELECT * FROM users WHERE username = '".Input::input($value) . "'";
but you should consider to use prepared statements..
$stmt = $this->__pdo->prepare("SELECT * FROM users WHERE username = :name");
$stmt->bindParam(':name', Input::input($value));
$result = $stmt->execute();