Подскажите, из-за чего метод Delete не удаляет пользователя (для примера показал и метод get - он работает)?
index.php
#$products = Database::getInstance()->get('products', ['name', '=', 'Macbook PRO']);
Database::getInstance()->delete('products', ['name', '=', 'Danu']);
Database.php
<?php
class Database
{
private static $instance = null;
private $pdo, $query, $error = false, $results, $count;
private function __construct()
{
try{
$this->pdo = new PDO("mysql:host=localhost;dbname=university;", 'mysql', 'mysql');
}
catch (PDOException $e){
echo $e->getMessage();
}
}
public function getInstance(){
if(!isset(self::$instance)){
self::$instance = new Database();
}
return self::$instance;
}
public function query($sql, $params=[]){
$this->error = false;
$this->query = $this->pdo->prepare($sql);
if(count($params)){
$i = 1;
foreach($params as $param){
$this->query->bindValue($i, $param);
$i++;
}
}
if(!$this->query->execute()){
$this->error = true;
}
else{
$this->results = $this->query->fetchAll(PDO::FETCH_OBJ);
$this->count = $this->query->rowCount();
}
return $this;
}
public function get($table, $where=[]){
return $this->action('SELECT', $table, $where);
}
public function delete($table, $where=[]){
return $this->action('DELETE', $table, $where);
}
public function action($action, $table, $where){
if(count($where) === 3){
$operators = ['=', '>', '<', '<=', '>='];
$field = $where[0];
$operator = $where[1];
$value = $where[2];
if(in_array($operator, $operators)){
$sql = "{$action} * FROM {$table} WHERE {$field} {$operator} ?";
if( !$this->query($sql, [$value])->showError() ){
return $this;
}
}
}
}
public function showError()
{
return $this->error;
}
public function showResult(){
return $this->results;
}
public function count(){
return $this->count;
}
}
UPDATE
Насколько я заметил проблема в методе query
$this->query->execute()
возвращает false 
