DATABASE Class OOP PHP

Question

Witam! Chciałbym poprosić o radę, czy jest sens robienia takich metod w klasie DATABASE? Czy warto zrobić to w inny sposób?

EX:

public function query($sql, $params = array(), $fetch = null, $fetchMode = PDO::FETCH_OBJ) {
        $this->_error = false;
        if($this->_query = $this->_pdo->prepare($sql)) {
            $x = 1;
            if(count($params)) {
                foreach($params as $param) {
                    $this->_query->bindValue($x, $param);
                    $x++;
                }
            }
            if($this->_query->execute()) {
                if($fetch) {
                    $this->_results = $this->_query->fetchAll($fetchMode);
                    $this->_count = $this->_query->rowCount();
                }
            } else {
                $this->_error = true;
            }
        }
        return $this;
    }