MySQL 实现点餐系统的支付管理功能

CREATE DATABASE IF NOT EXISTS `order_system`;
USE `order_system`;

CREATE TABLE IF NOT EXISTS `order` (
  `order_id` INT NOT NULL AUTO_INCREMENT,
  `user_id` INT NOT NULL,
  `amount` DECIMAL(10,2) NOT NULL,
  PRIMARY KEY (`order_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE IF NOT EXISTS `payment_method` (
  `payment_method_id` INT NOT NULL AUTO_INCREMENT,
  `payment_method_name` VARCHAR(50) NOT NULL,
  PRIMARY KEY (`payment_method_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE IF NOT EXISTS `payment_record` (
  `payment_record_id` INT NOT NULL AUTO_INCREMENT,
  `order_id` INT NOT NULL,
  `payment_method_id` INT NOT NULL,
  `payment_status` VARCHAR(20) NOT NULL,
  PRIMARY KEY (`payment_record_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `payment_method` (`payment_method_name`) VALUES
('支付宝'),
('微信支付'),
('银行卡支付');

<?php
// 连接数据库
$conn = mysqli_connect('localhost', 'username', 'password', 'order_system');

// 生成订单
$user_id = 1; // 假设用户ID为1
$amount = 10.00; // 假设订单金额为10.00元
$sql = "INSERT INTO `order` (user_id, amount) VALUES ($user_id, $amount)";
$result = mysqli_query($conn, $sql);
if ($result) {
  $order_id = mysqli_insert_id($conn);
  
  // 新建支付记录
  $payment_method_id = 1; // 假设支付方式ID为1，即支付宝
  $payment_status = '待支付';
  $sql = "INSERT INTO `payment_record` (order_id, payment_method_id, payment_status) VALUES ($order_id, $payment_method_id, '$payment_status')";
  $result = mysqli_query($conn, $sql);
  if ($result) {
    $payment_record_id = mysqli_insert_id($conn);
    
    // 用户完成支付，更新支付记录
    $payment_status = '已支付';
    $sql = "UPDATE `payment_record` SET payment_status = '$payment_status' WHERE payment_record_id = $payment_record_id";
    $result = mysqli_query($conn, $sql);
    if ($result) {
      echo '支付成功';
    } else {
      echo '支付失败';
    }
  } else {
    echo '创建支付记录失败';
  }
} else {
  echo '生成订单失败';
}

// 关闭数据库连接
mysqli_close($conn);
?>