PDO准备不起作用

Question

        $sifre = sha1(md5($this->password));
        $kayit_sql = "INSERT INTO uyeler (username, password, email, onayli) values (:nick, :pass, :email, :onayli)";
        $data = array(
        ':nick' => $this->nick,
        ':pass' => $sifre,
        ':email' => $this->email,
        ':onayli' => '0' );  
        $kayit_sorgusu = $this->baglanti->prepare($kayit_sql,array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
        $kayit_sorgusu->execute($data);

问题是插入数据库。当我运行此代码时，数据库记录是：

0,0,0,0

我该如何解决这个问题？ Database records