swoole+PHP實現訂單的延時處理(自動取消訂單，還原庫存等操作)的例子

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，這裏我們用到了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.html

二、說明，order_status爲1時代表客戶下單確定，爲2時代表客戶已付款，爲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爲1的產品庫存數量爲20，產品ID爲2的庫存數量爲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的庫存爲0了，產品ID2的庫存也爲0了，3、第三次下單時，程序提示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)，客戶又可以繼續下單了

 

1、所需要sql數據庫表

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、config.php

<?php
$dbHost = "192.168.0.110";
$dbUser = "root";
$dbPassword = "123";
$dbName = "test";
?>

 

3、order_submit.php

<?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
			//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

<?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"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);
}
?>