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CHAPTER 2 LAYING OUT THE FOUNDATIONS
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Note Adding Smarty or another template engine to a web application s architecture adds some initial
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coding effort and also implies a learning curve. However, you should try it anyway because the advantages of using such a modern development technique will prove to be significant later in the process.
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What About the Alternatives
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Smarty is not the only template engine available for PHP Other popular template engines are . Yapter (http://yapter.sourceforge.net/) EasyTemplate (http://www.onlinetools.org/tools/easytemplate/index.php) phpLib (http://phplib.sourceforge.net/) TemplatePower (http://templatepower.codocad.com/) Although all template engines follow the same basic principles, we chose to use Smarty in the PHP e-commerce project for this book because of its very good performance results, powerful features (such as template compilation and caching), and wide acceptance in the industry.
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Using PostgreSQL to Store Web Site Data
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Most of the data your visitors will see while browsing the web site will be retrieved from a relational database. A Relational Database Management System (RDBMS) is a complex software program, the purpose of which is to store, manage, and retrieve data as quickly and reliably as possible. For the HatShop web site, it will store all data regarding the products, departments, users, shopping carts, and so on. Many RDBMSs are available for you to use with PHP including PostgreSQL, MySQL, , Oracle, and so on. PostgreSQL is arguably the world s most advanced open source database, and it s a free, fast, and reliable database. Another important advantage is that many web hosting providers offer access to a PostgreSQL database, which makes your life easier when going live with your newly created e-commerce web site. We ll use PostgreSQL as the backend database when developing the HatShop e-commerce web site. The language used to communicate with a relational database is SQL (Structured Query Language). However, each database engine recognizes a particular dialect of this language. If you decide to use a different RDBMS than PostgreSQL, you ll probably need to update some of the SQL queries.
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Getting in Touch with PostgreSQL
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You talk with the database server by formulating an SQL query, sending it to the database engine, and retrieving the results. The SQL query can say anything related to the web site data, or its data structures, such as give me the list of departments, remove product no. 223, create a data table, or search the catalog for yellow hats.
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CHAPTER 2 LAYING OUT THE FOUNDATIONS
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No matter what the SQL query says, we need a way to send it to PostgreSQL. PostgreSQL ships with a simple, text-based interface (named psql ) that permits executing SQL queries and getting back the results. The command-line interface isn t particularly easy to use, but it is functional. However, there are alternatives. Several free, third-party database administration tools allow you to manipulate data structures and execute SQL queries via an easy-to-use graphical interface. In this book, we ll show you how to use pgAdmin III, which is an admin tool that ships together with PostgreSQL. Apart from needing to interact with PostgreSQL with a direct interface to its engine, you also need to learn how to access PostgreSQL programmatically, from PHP code. This requirement is obvious, because the e-commerce web site will need to query the database to retrieve catalog information (departments, categories, products, and so on) when building pages for the visitors. As for querying PostgreSQL databases through PHP code, the tool you ll rely on here is PDO (PHP Data Objects).
Implementing Database Integration Using PDO
PDO (PHP Data Objects) is a native data-access abstraction library that ships with PHP 5.1 and is offered as a PECL extension for PHP 5.0. (PECL is a repository of PHP extensions, located at http://pecl.php.net/.) The official PDO manual, together with installation instructions (which can also be found in Appendix A), is available at http://php.net/pdo. PDO offers a uniform way to access a variety of data sources. Using PDO increases your application s portability and flexibility because if the backend database changes, the effects on your data access code are kept to a minimum (in many cases, all that needs to change is the connection string for the new database). After you become familiar with the PDO data-access abstraction layer, you can use the same programming techniques on other projects that might require a different database solution. To demonstrate the difference between accessing the database using the old PHP functions and PDO, let s take a quick look at two short PHP code snippets.
Note If you aren t familiar with how the code works, don t worry we ll analyze everything in greater
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