code 39 barcodes in c# detail in the following chapters. in Visual C#.NET

Create Code 39 Extended in Visual C#.NET detail in the following chapters.

detail in the following chapters.
ANSI/AIM Code 39 Drawer In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create Code 39 Full ASCII image in .NET framework applications.
www.OnBarcode.com
ANSI/AIM Code 39 Recognizer In C#
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
The following shows database access using PHP native (PostgreSQL-specific) functions: // Connecting to PostgreSQL $link = pg_connect('host=localhost dbname=hatshop' . 'user=' . $username . ' password=' . $password) or die('Could not connect: ' . pg_last_error($link)); // Execute SQL query $queryString = 'SELECT * FROM product';
Barcode Generator In Visual C#
Using Barcode generation for .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Paint Code-128 In Visual C#
Using Barcode creator for VS .NET Control to generate, create Code 128C image in .NET framework applications.
www.OnBarcode.com
CHAPTER 2 LAYING OUT THE FOUNDATIONS
DataMatrix Generator In Visual C#
Using Barcode maker for .NET Control to generate, create Data Matrix ECC200 image in .NET applications.
www.OnBarcode.com
UPC-A Supplement 5 Encoder In C#.NET
Using Barcode drawer for .NET Control to generate, create UPC A image in Visual Studio .NET applications.
www.OnBarcode.com
$result = pg_query($link, $queryString) or die('Query failed : ' . pg_last_error($link)); // Close connection pg_close($link); Next, the same action is shown, this time using PDO: try { // Create a new PDO instance $database_handler = new PDO('pgsql:host=localhost;dbname=hatshop', $username, $password); // Prepare the SQL query $statement_handler = $database_handler->prepare('SELECT * FROM product'); // Execute SQL query $statement_handler->execute(); // Retrieve result $result = $statement_handler->fetchAll(); // Clear the PDO object instance $database_handler = null; } catch (PDOException $e) { /* If something goes wrong we catch the exception thrown by the object, print the message and stop the execution of script */ print 'Error! <br />' . $e->getMessage() . '<br />'; exit; } The version of the code that uses PDO is longer, but it includes a powerful error-handling mechanism and prepared statements (which protect you from injection-based attacks). If these concepts sound foreign, once again, wait until the later chapters where we ll put PDO to work, and you ll learn more about it there. Also, when using PDO, you won t need to change the data access code if, for example, you decide to use MySQL instead of PostgreSQL. On the other hand, the first code snippet, which uses PostgreSQL-specific functions, would need to change completely (use mysql_connect and mysql_query instead of pg_connect and pg_query, and so on). In addition, some MySQLspecific functions have different parameters than the similar PostgreSQL functions.
Barcode Maker In C#
Using Barcode printer for .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Encode 2/5 Interleaved In C#
Using Barcode maker for .NET Control to generate, create 2 of 5 Interleaved image in VS .NET applications.
www.OnBarcode.com
CHAPTER 2 LAYING OUT THE FOUNDATIONS
Decoding Code 39 In C#.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Code 3 Of 9 Reader In .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
When using a database abstraction layer (such as PDO), you ll probably only need to change the connection string when changing the database backend. Note that here we re only talking about the PHP code that interacts with the database. In practice, you might also need to update some SQL queries if the database engines support different dialects of SQL.
Encode EAN128 In None
Using Barcode drawer for Microsoft Word Control to generate, create GTIN - 128 image in Word applications.
www.OnBarcode.com
Code 3 Of 9 Reader In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Note To keep your SQL queries as portable as possible, keep their syntax as close as possible to the
Barcode Decoder In Java
Using Barcode Control SDK for BIRT reports Control to generate, create, read, scan barcode image in Eclipse BIRT applications.
www.OnBarcode.com
Barcode Generation In None
Using Barcode creation for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
SQL-92 standard. You ll learn more about SQL details in 3.
Universal Product Code Version A Maker In None
Using Barcode printer for Online Control to generate, create Universal Product Code version A image in Online applications.
www.OnBarcode.com
Encoding EAN13 In Objective-C
Using Barcode generator for iPhone Control to generate, create EAN 13 image in iPhone applications.
www.OnBarcode.com
PostgreSQL and the Three-Tier Architecture
Code 128C Scanner In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
PDF 417 Recognizer In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
It is clear by now that PostgreSQL is somehow related to the data tier. However, if you haven t worked with databases until now, it might be less than obvious that PostgreSQL is more than a simple store of data. Apart from the actual data stored inside, PostgreSQL is also capable of storing logic in the form of stored procedures, maintaining table relationships, ensuring various data integrity rules are obeyed, and so on. You can communicate with PostgreSQL through SQL (Structured Query Language), which is a language used to interact with the database. SQL is used to transmit to the database instructions such as Send me the last 10 orders or Delete product #123. Although it s possible to compose SQL statements in your PHP code and then submit them for execution, this is generally a bad practice, because it incurs security, consistency, and performance penalties. In our solution, we ll store all data tier logic using database functions. The code presented in this book was designed to work with PostgreSQL 8.1 (the most recent stable version at the time of writing). PostgreSQL consists of the data store in the e-commerce software project, as shown in Figure 2-5.
PDF417 Printer In Visual Studio .NET
Using Barcode printer for VS .NET Control to generate, create PDF417 image in Visual Studio .NET applications.
www.OnBarcode.com
Data Matrix Encoder In Objective-C
Using Barcode generator for iPad Control to generate, create DataMatrix image in iPad applications.
www.OnBarcode.com
Web Server
Presentation Tier
Smarty Componentized Templates
Business Tier
PHP 5 Classes Containing Business Logic
DataTier
PostgreSQL Stored Procedures PostgreSQL
Data
PostgreSQL Data Store
Figure 2-5. The technologies you ll use to develop HatShop
CHAPTER 2 LAYING OUT THE FOUNDATIONS
Choosing Naming and Coding Standards
Although coding and naming standards might not seem that important at first, they definitely shouldn t be overlooked. Not following a set of rules for your code will almost always result in code that s hard to read, understand, and maintain. On the other hand, when you follow a consistent way of coding, you can almost say your code is already half documented, which is an important contribution toward the project s maintainability, especially when more people are working on the same project at the same time.
Copyright © OnBarcode.com . All rights reserved.