generate code 39 barcode using c# CREATING THE PRODUCT CATALOG: PART I in C#.NET

Generation Code 3 of 9 in C#.NET CREATING THE PRODUCT CATALOG: PART I

CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
Code 3 Of 9 Creation In Visual C#.NET
Using Barcode creator for .NET Control to generate, create Code 3/9 image in .NET framework applications.
www.OnBarcode.com
Code 39 Extended Scanner In C#.NET
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
// Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; } 9. Create a file named catalog.php inside the business folder. Add the following code into this file: < php // Business tier class for reading product catalog information class Catalog { // Retrieves all departments public static function GetDepartments() { // Build SQL query $sql = 'SELECT * FROM catalog_get_departments_list();'; // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query and return the results return DatabaseHandler::GetAll($result); } } > 10. You need to include the newly created database_handler.php in app_top.php so you can make the class available for the application. To do this, add the highlighted code to the include/app_top.php file: < php // Include utility files require_once 'include/config.php'; require_once BUSINESS_DIR . 'error_handler.php'; // Sets the error handler ErrorHandler::SetHandler(); // Load the page template require_once PRESENTATION_DIR . 'page.php'; // Load the database handler require_once BUSINESS_DIR . 'database_handler.php'; >
Print Barcode In C#
Using Barcode printer for .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Generate PDF 417 In C#
Using Barcode encoder for VS .NET Control to generate, create PDF 417 image in Visual Studio .NET applications.
www.OnBarcode.com
CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
Painting Data Matrix 2d Barcode In C#
Using Barcode encoder for Visual Studio .NET Control to generate, create DataMatrix image in Visual Studio .NET applications.
www.OnBarcode.com
QR Code Printer In C#
Using Barcode generator for .NET framework Control to generate, create QR Code image in VS .NET applications.
www.OnBarcode.com
11. Create a new file named hatshop/include/app_bottom.php, and add the following in it: < php DatabaseHandler::Close(); > 12. This file must be included at the end of the main page index.php to close the connection. Modify your index.php file as follows: < php // Load Smarty library and config files require_once 'include/app_top.php'; // Load Smarty template file $page = new Page(); // Display the page $page->display('index.tpl'); // Load app_bottom which closes the database connection require_once 'include/app_bottom.php'; >
Generate Universal Product Code Version A In C#
Using Barcode maker for .NET Control to generate, create UCC - 12 image in .NET applications.
www.OnBarcode.com
MSI Plessey Maker In Visual C#.NET
Using Barcode encoder for VS .NET Control to generate, create MSI Plessey image in Visual Studio .NET applications.
www.OnBarcode.com
How It Works: The Business Tier Code
Paint USS Code 39 In Java
Using Barcode creation for Java Control to generate, create Code 3/9 image in Java applications.
www.OnBarcode.com
Recognizing Code 39 In Visual Studio .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
After adding the database connection data to config.php, you created the DatabaseHandler class. This class contains a number of wrapper methods that access PDO functions and provide the functionality needed for the rest of the business tier methods. The DatabaseHandler class has a private constructor, meaning that it can t be instantiated; you can t create DatabaseHandler objects, but you can execute the static methods for the class. Static class members and methods, as opposed to instance members and methods, are called directly using the class name, instead of an object of the class. For example, this is how you would call the instance method myMethod of a hypothetical class named MyClass: $myObject = new MyClass; $myObject->myMethod(); If myMethod was a static method, you would call it like this: MyClass::MyMethod();
Generating QR Code JIS X 0510 In Objective-C
Using Barcode generation for iPhone Control to generate, create QR Code JIS X 0510 image in iPhone applications.
www.OnBarcode.com
Barcode Recognizer In Java
Using Barcode Control SDK for BIRT Control to generate, create, read, scan barcode image in BIRT applications.
www.OnBarcode.com
Note Static members are OOP-specific features that aren t supported by PHP 4 and older versions. You can find a very good introduction to the OOP features in PHP 5 at http://php.net/manual/en/ language.oop5.php.
Code 128 Code Set C Creator In Java
Using Barcode encoder for Android Control to generate, create Code 128B image in Android applications.
www.OnBarcode.com
Paint UPC A In None
Using Barcode generator for Font Control to generate, create UCC - 12 image in Font applications.
www.OnBarcode.com
CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
Encode Barcode In None
Using Barcode printer for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Read Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
The database functions themselves have a standard structure, taking advantage of the fact that PDO has been configured to throw exceptions. Let s take a closer look at the GetRow method. // Wrapper method for PDOStatement::fetch public static function GetRow($statementHandler, $params = null, $fetchStyle = PDO::FETCH_ASSOC) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { self::Execute($statementHandler, $params); $result = $statementHandler->fetch($fetchStyle); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; } This method generates an error (using the trigger_error function) if the database command didn t execute successfully. The error is captured by the error-handling mechanism you implemented in 2. Because of the way you implemented the error-handling code in 2, generating an E_USER_ERROR error freezes the execution of the request, eventually logging and/or emailing the error data, and showing the visitor a nice Please come back later message (if there is such thing as a nice Please come back later message, anyway). Note that before the error is generated, we also close the database connection to ensure that we re not leaving any database resources occupied by the script. By default, if you don t specify to trigger_error the kind of error to generate, an E_USER_NOTICE message is generated, which doesn t interfere with the normal execution of the request (the error is eventually logged, but execution continues normally afterwards). The functionality in the DatabaseHandler class is meant to be used in the other business tier classes, such as Catalog. At this moment, Catalog contains a single method: GetDepartments. // Business tier class for reading product catalog information class Catalog { // Retrieves all departments public static function GetDepartments()
Barcode Drawer In VS .NET
Using Barcode printer for .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Making UCC.EAN - 128 In VB.NET
Using Barcode generator for .NET Control to generate, create GS1-128 image in VS .NET applications.
www.OnBarcode.com
Making QR-Code In VB.NET
Using Barcode printer for .NET Control to generate, create QR Code image in VS .NET applications.
www.OnBarcode.com
Draw Code 128A In None
Using Barcode generator for Software Control to generate, create Code 128 Code Set B image in Software applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.