PDO not storing values while in a class - php

Question

I'm a little confused at the moment because my DB class doesn't seem to be storing any results after a query (i.e. the 'results' property is still an empty array). The unsual thing is that when I transfer my logic outside a class definition it works perfectly.
My code with database credentials blanked out:
namespace DatabaseConnection;
use PDO;
class DB {
/*****STATES*****/
private $con;
private $results;
/*****METHODS*****/
public function init(){
$this->con = new PDO("***************************");
$this->results = array();
return $this;
}
public function getInfo(){
if($this->con === null ) return "No Connection";
else return "Connected";
}
public function getResults(){
return $this->results;
}
public function retrieve(){
$query = $this->con->prepare("select * from documents");
$query->execute();
while($row = $query->fetch(PDO::FETCH_ASSOC)){
$this->results[] = $row;
}
return $this;
}

Answer 1

Try:
public function retrieve(){
$query = $this->con->prepare("select * from documents");
$query->execute(); //<---------
while($row = $query->fetch(PDO::FETCH_ASSOC)){
$this->results[] = $row;
}
return $this;
}
OP is preparing a statement and then never executes it, and has no way of detecting this because of the utter lack of any error handling on the DB calls. – Marc B