Book Image

Learning PHP Data Objects

By : Dennis Popel
Book Image

Learning PHP Data Objects

By: Dennis Popel

Overview of this book

PDO is lighter, faster, and more powerful than existing PHP data abstraction interfaces. PDO is a common interface to different databases that must be used with a database-specific PDO driver to access a particular database server: the PDO extension does not provide a database abstraction by itself; it doesn't rewrite SQL, emulate missing database features, or perform any database functions using by itself. It performs the same role as other classic database abstraction layers such as ODBC and JDBC: it's a query abstraction layer that abstracts the mechanism for accessing a database and manipulating the returned records; each database driver that implements the PDO interface can also expose database-specific features as regular extension functions. ¬ PDO ships with PHP 5.1, and is available as an extension for PHP 5.0; it requires the new object-oriented features of PHP 5, and cannot run with earlier versions of PHP.This book will teach you how to use the PDO, including its advanced features. Readers need to be aware of the basics of data abstraction and should be familiar with PHP.
Table of Contents (13 chapters)

Chapter 6. Advanced PDO Usage

Now that we have familiarized ourselves with the basic features of PDO and used them to build a data-driven web applications, let’s see some advanced functionality. In this chapter, we will look at getting and setting connection attributes (such as column names, case conversion, and the name of the underlying PDO driver) as well as connecting to a database by specifying a connection configuration filename or an option in the php.ini file. We will also discuss transactions.

We will modify our library application to display the name of the database driver in the footer of every page. In addition to this simple change, we will extend the application to keep track of how many copies of a single book we have and to keep track of those people who have borrowed a book. We will use transactions for this functionality.

Setting and Getting Connection Attributes

We have briefly covered setting connection attributes in Chapter 3 when we saw how to use exceptions as a means...