面試官：說說swoole+PHP實現自動取消訂單，還原庫存等操作
阿新 • • 發佈：2021-01-21
一、業務場景
當客戶下單在指定的時間內如果沒有付款，那我們需要將這筆訂單取消掉，比如好的處理方法是運用延時取消，這裡我們用到了swoole，運用swoole的非同步毫秒定時器不會影響到當前程式的執行，具體參考：https://wiki.swoole.com/wiki/page/319.html
二、說明
order_status為1時代表客戶下單確定，為2時代表客戶已付款，為0時代表訂單已取消(正是swoole來做的)，下面的代表我沒有用框架，比較純的PHP代表方便理解和應用
三、舉例說明
庫存表csdn_product_stock產品ID為1的產品庫存數量為20，產品ID為2的庫存數量為40，然後客戶下單一筆產品ID1減10，產品ID2減20，所以庫存表只夠2次下單，例子中10秒後自動還原庫存，如下圖：
圖解：1、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；2、第二次下完單產品ID的庫存為0了，產品ID2的庫存也為0了，3、第三次下單時，程式提示Out of stock；4、過了10秒鐘(每個訂單下單後往後推10秒)，客戶兩次下單，由於沒有付款(csdn_order表的order_status為1)，產品1和產品2的庫存被還原了(csdn_order表的order_status變為0)，客戶又可以繼續下單了
1、所需要sql資料庫表
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');
2、資料庫配置資訊：config.php
<?php
$dbHost = "192.168.0.110";
$dbUser = "root";
$dbPassword = "123456";
$dbName = "test123";
?>
3、order_submit.php，生成訂單
<?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();//開啟事務處理 $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 = $stmtProductStock->rowCount(); //庫存沒有正常扣除，失敗，庫存表裡的product_stock_number設定了為非負數 //如果庫存不足時，sql異常：SQLSTATE[22003]: Numeric value out of range: 1690 BIGINT UNSIGNED value is out of range in '(`test`.`csdn_product_stock`.`product_stock_number` - 20)' if($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(); } ?>
4、order_cancel.php，這個方法主要就是做訂單自動取消，並還原庫存的業務處理
<?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();//開啟事務處理
$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"代表已下單，但未付款，我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);
}
?>
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