面試官：說說swoole+PHP實現自動取消訂單，還原庫存等操做

時間 2021-01-20

標籤 php html mysql laravel sql shell 數據庫 json 服務器 swoole 欄目快樂工作简体版

原文原文鏈接

1、業務場景

當客戶下單在指定的時間內若是沒有付款，那咱們須要將這筆訂單取消掉，好比好的處理方法是運用延時取消，這裏咱們用到了swoole，運用swoole的異步毫秒定時器不會影響到當前程序的運行，具體參考：https://wiki.swoole.com/wiki/page/319.htmlphp

2、說明

order_status爲1時表明客戶下單肯定，爲2時表明客戶已付款，爲0時表明訂單已取消(正是swoole來作的)，下面的表明我沒有用框架，比較純的PHP表明方便理解和應用html

3、舉例說明

庫存表csdn_product_stock產品ID爲1的產品庫存數量爲20，產品ID爲2的庫存數量爲40，而後客戶下單一筆產品ID1減10，產品ID2減20，因此庫存表只夠2次下單，例子中10秒後自動還原庫存，以下圖：mysql

圖解：一、第一次下完單產品ID1庫存從20減到了10，產品ID2庫存從40減到了20；二、第二次下完單產品ID的庫存爲0了，產品ID2的庫存也爲0了，三、第三次下單時，程序提示Out of stock；四、過了10秒鐘(每一個訂單下單後日後推10秒)，客戶兩次下單，因爲沒有付款(csdn_order表的order_status爲1)，產品1和產品2的庫存被還原了(csdn_order表的order_status變爲0)，客戶又能夠繼續下單了laravel

一、所須要sql數據庫表sql

DROP TABLE IF EXISTS `csdn_order`;
CREATE TABLE `csdn_order` (
  `order_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `order_amount` float(10,2) unsigned NOT NULL DEFAULT '0.00',
  `user_name` varchar(64) CHARACTER SET latin1 NOT NULL DEFAULT '',
  `order_status` tinyint(2) unsigned NOT NULL DEFAULT '0',
  `date_created` datetime NOT NULL,
  PRIMARY KEY (`order_id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS `csdn_order_detail`;
CREATE TABLE `csdn_order_detail` (
  `detail_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `order_id` int(10) unsigned NOT NULL,
  `product_id` int(10) NOT NULL,
  `product_price` float(10,2) NOT NULL,
  `product_number` smallint(4) unsigned NOT NULL DEFAULT '0',
  `date_created` datetime NOT NULL,
  PRIMARY KEY (`detail_id`),
  KEY `idx_order_id` (`order_id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS `csdn_product_stock`;
CREATE TABLE `csdn_product_stock` (
  `auto_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `product_id` int(10) NOT NULL,
  `product_stock_number` int(10) unsigned NOT NULL,
  `date_modified` datetime NOT NULL,
  PRIMARY KEY (`auto_id`),
  KEY `idx_product_id` (`product_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

INSERT INTO `csdn_product_stock` VALUES ('1', '1', '20', '2018-09-13 19:36:19');
INSERT INTO `csdn_product_stock` VALUES ('2', '2', '40', '2018-09-13 19:36:19');

二、數據庫配置信息：config.phpshell

<?php
$dbHost = "192.168.0.110";
$dbUser = "root";
$dbPassword = "123456";
$dbName = "test123";
?>

三、order_submit.php，生成訂單數據庫

<?php
require("config.php");
try {
    $pdo = new PDO("mysql:host=" . $dbHost . ";dbname=" . $dbName, $dbUser, $dbPassword, array(PDO::ATTR_PERSISTENT => true));
    $pdo->setAttribute(PDO::ATTR_AUTOCOMMIT, 1);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $orderInfo = array(
        'order_amount' => 10.92,
        'user_name' => 'yusan',
        'order_status' => 1,
        'date_created' => 'now()',
        'product_lit' => array(
            0 => array(
                'product_id' => 1,
                'product_price' => 5.00,
                'product_number' => 10,
                'date_created' => 'now()'
            ),
            1 => array(
                'product_id' => 2,
                'product_price' => 5.92,
                'product_number' => 20,
                'date_created' => 'now()'
            )
        )
    );

    try{
        $pdo->beginTransaction();//開啓事務處理

        $sql = 'insert into csdn_order (order_amount, user_name, order_status, date_created) values (:orderAmount, :userName, :orderStatus, now())';
        $stmt = $pdo->prepare($sql);  
        $affectedRows = $stmt->execute(array(':orderAmount' => $orderInfo['order_amount'], ':userName' => $orderInfo['user_name'], ':orderStatus' => $orderInfo['order_status']));
        $orderId = $pdo->lastInsertId();
        if(!$affectedRows) {
            throw new PDOException("Failure to submit order!");
        }
        foreach($orderInfo['product_lit'] as $productInfo) {

            $sqlProductDetail = 'insert into csdn_order_detail (order_id, product_id, product_price, product_number, date_created) values (:orderId, :productId, :productPrice, :productNumber, now())';
            $stmtProductDetail = $pdo->prepare($sqlProductDetail);  
            $stmtProductDetail->execute(array(':orderId' => $orderId, ':productId' =>  $productInfo['product_id'], ':productPrice' => $productInfo['product_price'], ':productNumber' => $productInfo['product_number']));

            $sqlCheck = "select product_stock_number from csdn_product_stock where product_id=:productId";  
            $stmtCheck = $pdo->prepare($sqlCheck);  
            $stmtCheck->execute(array(':productId' => $productInfo['product_id']));  
            $rowCheck = $stmtCheck->fetch(PDO::FETCH_ASSOC);
            if($rowCheck['product_stock_number'] < $productInfo['product_number']) {
                throw new PDOException("Out of stock, Failure to submit order!");
            }


            $sqlProductStock = 'update csdn_product_stock set product_stock_number=product_stock_number-:productNumber, date_modified=now() where product_id=:productId';
            $stmtProductStock = $pdo->prepare($sqlProductStock);  
            $stmtProductStock->execute(array(':productNumber' => $productInfo['product_number'], ':productId' => $productInfo['product_id']));
            $affectedRowsProductStock = $stmtProductStock->rowCount();

            //庫存沒有正常扣除，失敗，庫存表裏的product_stock_number設置了爲非負數
            //若是庫存不足時，sql異常：SQLSTATE[22003]: Numeric value out of range: 1690 BIGINT UNSIGNED value is out of range in '(`test`.`csdn_product_stock`.`product_stock_number` - 20)'
            if($affectedRowsProductStock <= 0) {
                throw new PDOException("Out of stock, Failure to submit order!");
            }
        }
        echo "Successful, Order Id is：" . $orderId ."，Order Amount is：" . $orderInfo['order_amount'] . "。";
        $pdo->commit();//提交事務
        //exec("php order_cancel.php -a" . $orderId . " &");
        pclose(popen('php order_cancel.php -a ' . $orderId . ' &', 'w'));
        //system("php order_cancel.php -a" . $orderId . " &", $phpResult);
        //echo $phpResult;
    }catch(PDOException $e){
        echo $e->getMessage();
        $pdo->rollback();
    }
    $pdo = null;
} catch (PDOException $e) {
    echo $e->getMessage();
}
?>

四、order_cancel.php，這個方法主要就是作訂單自動取消，並還原庫存的業務處理json

<?php
require("config.php");
$queryString = getopt('a:');
$userParams = array($queryString);
appendLog(date("Y-m-d H:i:s") . "\t" . $queryString['a'] . "\t" . "start");

try {
    $pdo = new PDO("mysql:host=" . $dbHost . ";dbname=" . $dbName, $dbUser, $dbPassword, array(PDO::ATTR_PERSISTENT => true));
    $pdo->setAttribute(PDO::ATTR_AUTOCOMMIT, 0);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    swoole_timer_after(10000, function ($queryString) {
        global $queryString, $pdo;

        try{
            $pdo->beginTransaction();//開啓事務處理

            $orderId = $queryString['a'];  
            $sql = "select order_status from csdn_order where order_id=:orderId";  
            $stmt = $pdo->prepare($sql);  
            $stmt->execute(array(':orderId' => $orderId));  
            $row = $stmt->fetch(PDO::FETCH_ASSOC);
            //$row['order_status'] === "1"表明已下單，但未付款，咱們還原庫存只針對未付款的訂單
            if(isset($row['order_status']) && $row['order_status'] === "1") {
                $sqlOrderDetail = "select product_id, product_number from csdn_order_detail where order_id=:orderId";  
                $stmtOrderDetail = $pdo->prepare($sqlOrderDetail);  
                $stmtOrderDetail->execute(array(':orderId' => $orderId));  
                while($rowOrderDetail = $stmtOrderDetail->fetch(PDO::FETCH_ASSOC)) {
                    $sqlRestoreStock = "update csdn_product_stock set product_stock_number=product_stock_number + :productNumber, date_modified=now() where product_id=:productId";  
                    $stmtRestoreStock = $pdo->prepare($sqlRestoreStock);
                    $stmtRestoreStock->execute(array(':productNumber' => $rowOrderDetail['product_number'], ':productId' => $rowOrderDetail['product_id']));
                }

                $sqlRestoreOrder = "update csdn_order set order_status=:orderStatus where order_id=:orderId";  
                $stmtRestoreOrder = $pdo->prepare($sqlRestoreOrder);
                $stmtRestoreOrder->execute(array(':orderStatus' => 0, ':orderId' => $orderId));
            }

            $pdo->commit();//提交事務
        }catch(PDOException $e){
            echo $e->getMessage();
            $pdo->rollback();
        }
        $pdo = null;

        appendLog(date("Y-m-d H:i:s") . "\t" . $queryString['a'] . "\t" . "end\t" . json_encode($queryString));
    }, $pdo);

} catch (PDOException $e) {
    echo $e->getMessage();
}
function appendLog($str) {
    $dir = 'log.txt';
    $fh = fopen($dir, "a");
    fwrite($fh, $str . "\n");
    fclose($fh);
}
?>

點關注，不迷路

好了各位，以上就是這篇文章的所有內容了，能看到這裏的人呀，都是人才。以前說過，PHP方面的技術點不少，也是由於太多了，實在是寫不過來，寫過來了你們也不會看的太多，因此我這裏把它整理成了PDF和文檔，若是有須要的能夠服務器

點擊進入暗號: PHP+「平臺」swoole

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