Question

我正在创建网站民意调查，但出现此错误：

调用未定义的方法Poll :: updatePoll（）第10行上的C：\ xampp \ htdocs \ poll \ controllers \ poll.php

我已经检查了我的类定义和方法。一切似乎都很好，但错误不断出现。这是我模型中的代码：

<?php

class Poll {

    private $db;

    //method requires a database connection as argument
    public function __construct( $dbConnection ) {
        //store the received conection in the $this->db property\
        $this->db = $dbConnection;  
    }

    public function updatePoll( $input ) {
        if ( $input==='yes') {
            $updateSQL = "UPDATE poll SET yes = yes + 1 WHERE poll_id = 1";
        } else if ( $input === 'no') {
            $updateSQL = "UPDATE poll SET no = no + 1 WHERE poll_id = 1";
        }
        $updateStatement = $this->db->prepare($updateSQL);
        $updateStatement->execute();
    }

    public function getPollData() {
        //The actual SQL statement 
        $sql = "SELECT poll_question, yes, no FROM poll WHERE poll_id = 1";
        //Use the PDO connection to create a PDOStatement object
        $statement = $this->db->prepare($sql);
        //tell MySQL to execute the statement
        $statement->execute();
        //retrieve the first row of data from the table
        $pollData = $statement->fetchObject();
        //make poll data available to the caller    
        return $pollData;
    }
}

我的控制器中的代码如下：

<?php
    include_once "models/poll.class.php";

    $poll = new Poll( $db );
    //check if the poll is submitted 
    $isPollSubmitted = isset($_POST['user-input']);
    if ( $isPollSubmitted ) {
        $input = $_POST['user-input'];
        $poll->updatePoll($input);
    }

    $pollData = $poll->getPollData();
    $pollView = include_once "views/poll-html.php";
    return $pollView;

?>

这是我的索引文件中的代码。我怀疑$ db（数据库连接）可能有问题

<?php
    error_reporting(E_ALL);
    ini_set("display_errors", 1);

    //load model
    include_once "models/Page_Data.class.php";
    $PageData = new Page_Data;
    $PageData->title = "PHP/MySQL site poll example";

    $PageData->content = include_once "controllers/poll.php";


    //database credentials
    $dbInfo = "mysql:host=localhost;dbname=playground";
    $dbUser = "root";
    $dbPassword = "";

    $db = new PDO( $dbInfo, $dbUser, $dbPassword);
    $db->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

    $page = include_once "views/page.php";
    //output generated page
    echo $page; 


?>

调用未定义的方法Poll :: updatePoll（）

0 个答案: