php - PDO 准备（）错误

Question

我有这个，错误（是的，我已经搜索过了，但找不到任何解决方案）。

Fatal error: Call to a member function prepare() on a non-object in C:\inetpub\oop\_classes\class.users.php on line 19

类.users.php：

<?php
include_once("class.db.php");

class Users {

    protected $vpanel;

    public function __construct() {

        $this->vpanel = new Database();
        $this->vpanel = $this->vpanel->dbConnection();

    }

    public function Login($username, $password) {

        if(!empty($username) || !empty($password)) {

            $sth = $this->vpanel->prepare("SELECT * FROM `users` WHERE `username` = ? AND `password` = ?");
            $sth->bindParam(1, $username);
            $sth->bindParam(2, $password);
            $sth->execute();

            if($sth->rowCount() == 1) {

                echo "Correct details.";

            } else {

                echo "Incorrect details.";

            }


        } else {

            echo "Fill out all the fields.";

        }
    }
} ?>

类.db.php：

<?php

class Database {

    public function dbConnection() {

        $dbhost = "localhost";
        $dbname = "DBNAME";
        $dbusername = "DBUSERNAME";
        $dbpass = "PASSWORD";

        try {

            $this->vpanel = new PDO("mysql:host".$dbhost.";dbname=".$dbname."", $dbusername, $dbpass);
            $this->vpanel->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

        } catch(PDOException $e) {

            echo $e->getMessage() . " (class.core.php) ";

        }

    }
} ?>

全局.php：

<?php

session_start();

ini_set('display_errors', 1);

require_once $_SERVER['DOCUMENT_ROOT'] . "/_includes/config.php";

try {

    $vpanel = new PDO("mysql:host".$Config['db']['host'].";dbname=".$Config['db']['dbname']."", $Config['db']['uname'], $Config['db']['pass']);

} catch(PDOException $e) {

    echo $e->getMessage();

}

require_once $_SERVER['DOCUMENT_ROOT'] . "/_classes/class.db.php";
require_once $_SERVER['DOCUMENT_ROOT'] . "/_classes/class.users.php";

$database = new Database();
$users = new Users(); ?>

我不知道出了什么问题，我是 PDO 方法（以及一些 OOP）的新手……所以……谢谢。

Answer 1

您的 dbConnection 没有返回任何内容。您需要让它返回 $this->vpanel 以便 Users->__construct 可以将其分配给类变量。

public function dbConnection() {

    $dbhost = "localhost";
    $dbname = "DBNAME";
    $dbusername = "DBUSERNAME";
    $dbpass = "PASSWORD";

    try {

        $this->vpanel = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbusername, $dbpass);
        $this->vpanel->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        return $this->vpanel;
    } catch(PDOException $e) {

        echo $e->getMessage() . " (class.core.php) ";
        return false;
    }
}

以及您的登录功能：

public function Login($username, $password) {

    if($this->vpanel === false){
        echo "There is no database connection.";
        return false;
    }

    if(!empty($username) && !empty($password)) {

        $sth = $this->vpanel->prepare("SELECT * FROM `users` WHERE `username` = ? AND `password` = ?");
        $sth->bindParam(1, $username);
        $sth->bindParam(2, $password);
        $sth->execute();

        if($sth->rowCount() == 1) {

            echo "Correct details.";

        } else {

            echo "Incorrect details.";

        }


    } else {

        echo "Fill out all the fields.";

    }
}