使用 phalcon 检查数据库中是否存在电子邮件

Question

我有以下代码：

<?php

use Phalcon\Mvc\Controller;
use Phalcon\Mvc\Model\Query;

class SignupController extends Controller
{
    public function indexAction()
    {

    }

    public function registerAction()
    {


        $user = new Users();

        // Store and check for errors
        $success = $user->save(
            $this->request->getPost(),
            [
                "name",
                "email",
            ]
        );

        // Instantiate the Query
        $query = new Query(
            'SELECT email FROM users',
            $this->getDI()
        );

        // Execute the query returning a result if any
        $users = $query->execute();


        if($user==$users)
        {
            echo "Email already exists";
        }

        else if ($success)
        {
            echo "Thanks for registering!";
        } else
            {
            echo "Sorry, the following problems were generated: ";

            $messages = $user->getMessages();

            foreach ($messages as $message) {
                echo $message->getMessage(), "<br/>";
            }
        }


        $this->view->disable();
    }
}

我要做的是检查给定的电子邮件是否已在数据库中注册。

我试图用这部分代码做到这一点

// Instantiate the Query
        $query = new Query(
            'SELECT email FROM users',
            $this->getDI()
        );

        // Execute the query returning a result if any
        $users = $query->execute();


        if($user==$users)
        {
            echo "Email already exists";
        }

它似乎不起作用，我收到以下错误

"异常：无法从模型列表中获取模型的来源：'Users'，准备时：SELECT email FROM users"

我的型号列表代码如下

<?php

use Phalcon\Mvc\Model;

class Users extends Model
{
    public $id;
    public $name;
    public $email;
}

谁能告诉我我做错了什么或者我想如何检查给定的电子邮件是否已经添加到数据库中，然后“回显”适当的消息。

提前感谢您的宝贵时间

最终工作代码

<?php

use Phalcon\Mvc\Controller;


class SignupController extends Controller
{
    public function indexAction()
    {

    }

    public function getSource()
    {
        return 'users';
    }




    public function registerAction()
    {

        $user = new Users();

        $email = $this->request->getPost('email', 'string', '');
        $result = users::findFirst(
            [
                'conditions' => 'email = :email:',
                'bind' => [
                    'email' => $email,
                ]
            ]
        );

        if (false !== $result) {
            echo 'The email exists in the database';
        } else {

            // Store and check for errors
            $success = $user->save(
                $this->request->getPost(),
                [
                    "name",
                    "email",
                ]
            );

            if ($success) {
                echo "Thanks for registering!";
            } else {
                echo "Sorry, the following problems were generated: ";

                $messages = $user->getMessages();

                foreach ($messages as $message) {
                    echo $message->getMessage(), "<br/>";
                }
            }


            $this->view->disable();
        }
    }
}

Answer 1

对于您的错误，您需要告诉模型它映射到哪个表：

public function getSource()
{
    return 'users';
}

更简单的方法是在模型上使用findFirst，如下所示：

$email  = $this->request->getPost('email', 'string', '');
$result = Users::findFirst(
    [
        'conditions' => 'email = :email:',
        'bind'       => [
            'email' => $email,
        ]
    ]
);

if (false !== $result) {
    echo 'The email exists in the database';
}

以上代码的作用： - 从发布的数据中获取email。将其消毒为字符串。如果尚未发布，则返回一个空字符串 - 在Users 模型中搜索email 字段的任何记录中存在的电子邮件。 - 如果没有返回任何内容，则继续，如果找到匹配项，则将结果回显。