我正在建立一个披萨订购网站，我试图获取OnlinePizzaOrderingPage.html上用户选择的披萨，并在ShoppingCartpage.php上输出用户的订单。这仅在用户下订单一次时有效，如果他/她再次下订单，则第一个订单将被覆盖。如何不覆盖第一顺序，以便可以显示第一顺序，然后在第一顺序下方显示第二顺序。
我尝试使用PHP，POST，GET和Javascript。 OnlinePizzaOrderingPage.html上不允许使用按钮。我已包含SQL代码，可能是解决该问题所必需的。
OnlinePizzaOrderingPage.html
<!DOCTYPE html>
<html>
<head>
<title>Online Pizza Ordering Page</title>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>
<body>
<h1>Online Pizza Ordering Page</h1>
<a href="Detailedsauceandquantitypage.php?pizza=supreme">
<img src="supreme.jpg" width="82" height="86" title="Supreme"
alt="Supreme">
</a>
<a href="Detailedsauceandquantitypage.php?pizza=meatlover">
<img src="meatlover.jpg" width="82" height="86"
title="Meatlover" alt="Meatlover">
</a>
<a href="Detailedsauceandquantitypage.php?pizza=hawaii">
<img src="hawaii.jpg" width="82" height="86" title="Hawaii"
alt="Hawaii">
</a>
<a href="Detailedsauceandquantitypage.php?pizza=fourseasons">
<img src="fourseasons.jpg" width="82" height="86" title="Four
Seasons" alt="Four Seasons">
</a>
<a href="Detailedsauceandquantitypage.php?pizza=vege">
<img src="vege.jpg" width="82" height="86" title="Vege"
alt="Vege">
</a>
</body>
</html>
DetailedSauceandquantitypage.php
<!DOCTYPE html>
<html>
<head>
<script src="script.js"></script>
<title>Detailed sauce and quantity page</title>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>
<body>
<h1>Detailed sauce and quantity page</h1>
<form action="ShoppingCartpage.php" method="POST">
<!-- set form value to retrieve and pass the selected pizza to
the cart -->
<input type="hidden" name="pizza" value="<?php echo
htmlspecialchars($_GET['pizza'], ENT_QUOTES, 'UTF-8', false); ?>">
<img src="bbq.jpg" alt="BBQ">
<label for="numberOfSauces">Number of Pizzas (0-100):</label>
<input type="number" name="bbqPizza" min="0" max="100"
value="0">
<br>
<img src="tomato.jpg" alt="Tomato">
<label for="numberOfSauces">Number of Pizzas (0-100):</label>
<input type="number" name="tomatoPizza" min="0" max="100"
value="0">
<br>
<img src="salsa.jpg" alt="Salsa">
<label for="numberOfSauces">Number of Pizzas (0-100):</label>
<input type="number" name="salsaPizza" min="0" max="100"
value="0">
<br>
<input type="submit" value="Add to cart" name="submit">
<br>
</form>
</body>
</html>
ShoppingCartpage.php
<!DOCTYPE html>
<html>
<head>
<title>Shopping Cart page</title>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>
<body>
<h1>Shopping Cart page</h1>
<?php
// define variables and set to empty values
$bbqPizza = $tomatoPizza = $salsaPizza = "";
if ( isset( $_POST['submit'] ) ) {
$pizza = $_POST['pizza']; //value from first page
$bbq = $_POST["bbqPizza"];
$tomato = $_POST["tomatoPizza"];
$salsa = $_POST["salsaPizza"];
echo $bbq . " " . $pizza . " pizzas with bbq sauce, " .
$tomato . " " . $pizza . " pizzas with tomato sauce and " . $salsa . "
" . $pizza . " Spizzas with salsa sauce.";
}
?>
<br>
<a href="OnlinePizzaOrderingPage.html">Add more pizzas to cart</a>
<a href="Checkoutpage.html">Go to checkout</a>
</body>
</html>
pizzastore.sql
-- phpMyAdmin SQL Dump
-- version 4.0.10.19
-- https://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Apr 18, 2019 at 02:42 PM
-- Server version: 5.1.73
-- PHP Version: 5.3.3
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
--
-- Database: `pizzastore`
--
-- --------------------------------------------------------
--
-- Table structure for table `CUSTOMER`
--
CREATE TABLE IF NOT EXISTS `CUSTOMER` (
`CustID` int(8) NOT NULL,
`UserName` varchar(16) NOT NULL,
`Password` varchar(8) NOT NULL,
`GivenName` varchar(16) NOT NULL,
`LastName` varchar(16) NOT NULL,
`Address` varchar(32) NOT NULL,
`CreditCard` int(16) NOT NULL,
`Email` varchar(32) NOT NULL,
PRIMARY KEY (`CustID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Dumping data for table `CUSTOMER`
--
INSERT INTO `CUSTOMER` (`CustID`, `UserName`, `Password`, `GivenName`,
`LastName`, `Address`, `CreditCard`, `Email`) VALUES
(1000, 'AAA', '1234abcd', 'Bill', 'John', '3 First Ave, Eastwood,
Sydney', 2147483647, 'b.john@wsu.edu.au'),
(2000, 'BBB', 'abcd1234', 'Leon', 'Jack', '1 Third Road, Parramatta,
Sydney', 2147483647, 'l.jack@navitas.com');
-- --------------------------------------------------------
--
-- Table structure for table `ORDER`
--
CREATE TABLE IF NOT EXISTS `ORDER` (
`OrderID` int(8) NOT NULL,
`CustID` int(8) NOT NULL,
`OrderDate` date NOT NULL,
`OrderTime` time NOT NULL,
`OrderStatus` varchar(16) NOT NULL DEFAULT 'Pending',
PRIMARY KEY (`OrderID`,`CustID`),
KEY `CustID` (`CustID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Dumping data for table `ORDER`
--
INSERT INTO `ORDER` (`OrderID`, `CustID`, `OrderDate`, `OrderTime`,
`OrderStatus`) VALUES
(1, 2000, '2018-01-01', '12:30:00', 'Pending'),
(2, 2000, '2017-12-25', '17:00:00', 'Pending'),
(3, 1000, '2018-01-02', '18:00:00', 'Pending'),
(4, 1000, '2017-11-01', '20:00:00', 'delivered');
-- --------------------------------------------------------
--
-- Table structure for table `ORDER_DETAILS`
--
CREATE TABLE IF NOT EXISTS `ORDER_DETAILS` (
`OrderID` int(8) NOT NULL,
`PizzaID` int(8) NOT NULL,
`SauceID` int(8) NOT NULL,
`Quantity` int(2) NOT NULL,
PRIMARY KEY (`OrderID`,`PizzaID`,`SauceID`),
KEY `PizzaID` (`PizzaID`),
KEY `SauceID` (`SauceID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Dumping data for table `ORDER_DETAILS`
--
INSERT INTO `ORDER_DETAILS` (`OrderID`, `PizzaID`, `SauceID`,
`Quantity`) VALUES
(1, 222, 101, 2),
(1, 333, 202, 1),
(3, 222, 303, 2),
(3, 555, 101, 1),
(4, 222, 202, 3),
(4, 444, 202, 4);
-- --------------------------------------------------------
--
-- Table structure for table `PIZZA`
--
CREATE TABLE IF NOT EXISTS `PIZZA` (
`PizzaID` int(8) NOT NULL,
`PizzaName` varchar(16) NOT NULL,
`Price` decimal(4,2) NOT NULL,
`Size` int(2) NOT NULL,
`Picture` varchar(30) NOT NULL,
PRIMARY KEY (`PizzaID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Dumping data for table `PIZZA`
--
INSERT INTO `PIZZA` (`PizzaID`, `PizzaName`, `Price`, `Size`,
`Picture`) VALUES
(111, 'Supreme', '19.95', 7, 'supreme.jpg'),
(222, 'Veggie', '15.95', 7, 'vege.jpg'),
(333, 'Hawaii', '16.95', 7, 'hawaii.jpg'),
(444, 'Meatlover', '19.95', 7, 'meatlover.jpg'),
(555, 'Four seasons', '22.95', 7, 'fourseasons.jpg');
-- --------------------------------------------------------
--
-- Table structure for table `SAUCE`
--
CREATE TABLE IF NOT EXISTS `SAUCE` (
`SauceID` int(8) NOT NULL,
`SauceName` varchar(16) NOT NULL,
`SauceCost` decimal(4,2) NOT NULL,
`SaucePic` varchar(20) NOT NULL,
PRIMARY KEY (`SauceID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Dumping data for table `SAUCE`
--
INSERT INTO `SAUCE` (`SauceID`, `SauceName`, `SauceCost`, `SaucePic`)
VALUES
(101, 'BBQ', '5.95', 'bbq.jpg'),
(202, 'Hot chilli', '4.95', 'salsa.jpg'),
(303, 'Tomato', '4.95', 'tomato.jpg');
--
-- Constraints for dumped tables
--
--
-- Constraints for table `ORDER`
--
ALTER TABLE `ORDER`
ADD CONSTRAINT `ORDER_ibfk_1` FOREIGN KEY (`CustID`) REFERENCES
`CUSTOMER` (`CustID`) ON UPDATE CASCADE;
--
-- Constraints for table `ORDER_DETAILS`
--
ALTER TABLE `ORDER_DETAILS`
ADD CONSTRAINT `ORDER_DETAILS_ibfk_1` FOREIGN KEY (`PizzaID`)
REFERENCES `PIZZA` (`PizzaID`) ON UPDATE CASCADE,
ADD CONSTRAINT `ORDER_DETAILS_ibfk_4` FOREIGN KEY (`OrderID`)
REFERENCES `ORDER` (`OrderID`) ON UPDATE CASCADE,
ADD CONSTRAINT `ORDER_DETAILS_ibfk_5` FOREIGN KEY (`SauceID`)
REFERENCES `SAUCE` (`SauceID`);
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
我希望结果将是在ShoppingCartpage.php上输出的第一个订单，而第二个订单将在第一个订单下方输出。实际结果是第二个命令仅覆盖了第一个命令，而第一个命令消失了。