c# code 39 barcode IMPLEMENTING THE ORDER PIPELINE: PART I in Visual C#.NET

Generation Code39 in Visual C#.NET IMPLEMENTING THE ORDER PIPELINE: PART I

CHAPTER 13 IMPLEMENTING THE ORDER PIPELINE: PART I
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3. PsShipOk enters the shipment date in the database, advances the order status, and tells OrderProcessor to continue. 4. OrderProcessor detects the new order status and calls PsFinalNotification. 5. PsFinalNotification sends an email to the customer confirming that the order has been shipped and advances the order stage. 6. OrderProcessor terminates. If anything goes wrong at any point in the pipeline processing, such as a credit card being declined, an email is sent to an administrator. The administrator then has all the information necessary to check what has happened, get in contact with the customer involved, and cancel or replace the order if necessary. No point in this process is particularly complicated; it s just that a lot of code is required to put this into action!
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Laying the Groundwork
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Before you start building the components just described, you need to make a few modifications to the HatShop database and web application. During order processing, one of the most important functions of the pipeline is to maintain an up-to-date audit trail. The implementation of this audit trail involves adding records to a new database table called audit. We ll add the audit table in the following exercise. To implement the functionality just described, you ll also need to add a new function named orders_create_audit to the hatshop database. The orders_create_audit function adds an entry to the audit table. We ll also create the OrderProcessor class (the class responsible for moving an order through the pipeline), which contains a lot of code. However, you can start simply, and build up additional functionality as needed. To start with, you ll create a version of the OrderProcessor class with the following functionality: Dynamically selects a pipeline section supporting the IPipelineSection interface Adds basic auditing data Gives access to the current order details Gives access to the customer for the current order Gives access to administrator mailing Mails the administrator in case of error You ll create a single pipeline section, PsDummy, which uses some of this functionality. PsDummy is used in the code of this chapter in place of the real pipeline section classes, which you ll implement in the next chapter.
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CHAPTER 13 IMPLEMENTING THE ORDER PIPELINE: PART I
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Exercise: Implementing the Skeleton of the Order-Processing Functionality
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1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the audit table in your hatshop database: -- Create audit table CREATE TABLE audit ( audit_id SERIAL NOT NULL, order_id INTEGER NOT NULL, created_on TIMESTAMP NOT NULL, message TEXT NOT NULL, message_number INTEGER NOT NULL, CONSTRAINT pk_audit_id PRIMARY KEY (audit_id), CONSTRAINT fk_order_id FOREIGN KEY (order_id) REFERENCES orders (order_id) ON UPDATE RESTRICT ON DELETE RESTRICT ); 4. Use the query tool to execute this code, which creates the orders_create_audit function in your hatshop database: -- Create orders_create_audit function CREATE FUNCTION orders_create_audit(INTEGER, TEXT, INTEGER) RETURNS VOID LANGUAGE plpgsql AS $$ DECLARE inOrderId ALIAS FOR $1; inMessage ALIAS FOR $2; inMessageNumber ALIAS FOR $3; BEGIN INSERT INTO audit (order_id, created_on, message, message_number) VALUES (inOrderId, NOW(), inMessage, inMessageNumber); END; $$; 5. Moving to the business tier, add the following method to the Orders class from business/orders.php: // Creates audit record public static function CreateAudit($orderId, $message, $messageNumber) { // Build the SQL query $sql = 'SELECT orders_create_audit(:order_id, :message, :message_number);'; // Build the parameters array $params = array (':order_id' => $orderId, ':message' => $message, ':message_number' => $messageNumber);
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CHAPTER 13 IMPLEMENTING THE ORDER PIPELINE: PART I
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// Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); } 6. Add a new file to the business directory called order_processor.php with the following code: < php /* Main class, used to obtain order information, run pipeline sections, audit orders, etc. */ class OrderProcessor { public $mOrderInfo; public $mOrderDetailsInfo; public $mCustomerInfo; public $mContinueNow; private $_mCurrentPipelineSection; private $_mOrderProcessStage; // Class constructor public function __construct($orderId) { // Get order $this->mOrderInfo = Orders::GetOrderInfo($orderId); if (empty ($this->mOrderInfo['shipping_id'])) $this->mOrderInfo['shipping_id'] = -1; if (empty ($this->mOrderInfo['tax_id'])) $this->mOrderInfo['tax_id'] = -1; // Get order details $this->mOrderDetailsInfo = Orders::GetOrderDetails($orderId); // Get customer associated with the processed order $this->mCustomerInfo = Customer::Get($this->mOrderInfo['customer_id']); $credit_card = new SecureCard(); $credit_card->LoadEncryptedDataAndDecrypt( $this->mCustomerInfo['credit_card']); $this->mCustomerInfo['credit_card'] = $credit_card; } /* Process is called from
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