private function executeQuery($query, $data = null) {
        $stmt = $this->conn->prepare($query);
        $stmt->execute($data);
        
        return $stmt;
    }
private function executeQuery($query, $data = null) {
        $stmt = $this->conn->prepare($query);
        $stmt->execute($data);
        
        return $stmt;
    }
private function executeQuery ( $ query , $ data = null ) { $ stmt = $ this -> conn -> prepare ( $ query ) ; $ stmt -> execute ( $ data ) ; return $ stmt ; }
Execute a raw query

@param string $query
@param array $data
@return object statement object
Execute a raw query