switch.php

<?php

    if (preg_match('_^\s*SELECT _i', $query)) {
        return $stmt->$fetch(PDO::FETCH_ASSOC);
    } elseif (preg_match('_^\s*INSERT _i', $query) {
        return $this->lastInsertId();
    } elseif (preg_match('_^\s*UPDATE _i', $query) || preg_match('_^\s*DELETE _i', $query) {
        return $stmt->rowCount();
    }
    return $stmt->$fetch();
  }