PDO不会从mysql返回数据到jQuery AJAX [英] PDO doesnt return data from mysql to jQuery AJAX

问题描述

我正在使用Web应用程序维护餐厅的管理，其中包括以下功能:

I'm working on a web application to maintain the administration of a restaurant, wich the functions such as:

• 在单击一个订单时显示所有订单的列表以及其中的特定数据
• 做出或删除订单
• 维护财务状况
• 等...

首先，我习惯于使用mysqli扩展名，并且使用了类似这样的功能(带有return语句):

First i was used to using the mysqli extension, and was using functions like this (with the return statement):

function get_all_data_by_order_id($order_id) {
    $query = "SELECT customers.first_name,
                     customers.last_name,
                     customers.email_adress,
                     customers.customer_info,

                     orders.order_info,
                     orders.total_price,
                     orders.location,
                     orders.created

                     FROM customers
             INNER JOIN orders ON customers.id = orders.customer_id

             WHERE orders.id = {$order_id}";

    return $this->query($query);
}

现在我想在PDO上尝试一下，这样我可以更轻松地使用准备好的语句.

And now i wanted to try it with PDO so i could use prepared statement easier.

我有这个php文件:

try {
    $connection = new PDO('mysql:host=localhost;dbname=broodjes-service', 'root', 'password');
    $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    if (!empty($_GET['order_id'])) {
        $order_id = $_GET['order_id'];

        $query = "SELECT customers.first_name,
                         customers.last_name,
                         customers.email_adress,
                         customers.customer_info,

                         orders.order_info,
                         orders.total_price,
                         orders.location,
                         orders.created

                         FROM customers

                 INNER JOIN orders ON customers.id = orders.customer_id

                 WHERE orders.id = :order_id";

        $statement = $connection->prepare($query);
        $statement->bindParam(":order_id", $order_id, PDO::PARAM_INT);
        $statement->execute();
        $order_data = $statement->fetch(PDO::FETCH_ASSOC);

        $orderObject = array();
        $orderObject['header'] = mysqli_fetch_array($order_data);

        echo json_encode($orderObject);

        $connection = null;
    }
} catch (PDOException $e) {
    echo $e->getMessage();
    die();
}

此段javascript会调用它，以使其看起来好像页面未在重新加载:

Wich is getting called by this piece of javascript to make it look like the page is'nt reloading:

function select_order(order) {
    var item = $(order);
    if (!item.hasClass("selectedRow")) {
        if (!selectedOrderInformation.is(":visible")) {
            switchScreen(selectedOrderInformation, financeOverview);
        }
        item.parent().find(".selectedRow").removeClass("selectedRow");
        item.addClass("selectedRow");
        selectedOrderInformation.html("loading......");
        $.ajax({
            url: "includes/functions/select-order.php",
            type: "get",
            dataType: 'json',
            data: {order_id: item.attr("data-order-index")},
            success: function (data) {
                selectedOrderInformation.html('<h3>' + data['header']['first_name'] + '</h3>');                }
        });
    } else {
        console.log("DEBUG: Row is already selected");
    }
}

问题

当我尝试在列表中选择一个订单时，什么都没有发生.屏幕停留在正在加载..."屏幕上.似乎甚至没有执行查询.

When i try to select a order inside the list theyre in, nothing is happening. The screen stays on the 'loading...' screen. It seems like it is'nt even executing the query.

问题

我该如何做到这一点，以便我的javascript文件通过从mysql数据库中部署数据来对php文件做出实际反应?

How can i make it so that my javascript file actually reacts on the php file by deploying data from the mysql database?

推荐答案

请勿混合PDO和MySQLi

由于您只想选择一行，因此请使用 fetch() 或 fetchAll()[0]

推荐方式:

$statement->execute();
$orderObject = array();
$orderObject['header'] = $statement->fetch();   //or: $statement->fetchAll()[0]
echo json_encode($orderObject);

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