phpのmysqli汎用操作クラス(プリミティブ)

mysqli = new mysqli($local, $user, $pwd, $dbs);
        $this->mysqli->set_charset("utf8");
    }

    //  sql
    function excmd($sqls)
    {
        $result = $this->mysqli->query($sqls);
        return $result;
    }
}

?>

excmd("select * from bookinfo");
while (! ! $row = $result->fetch_row()) {
    echo $row[1] . "
";
}
?>