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)

Creating the Edit Author Page

Our application still lacks the add/edit author functionality. This page will be somewhat simpler than the edit book page because it will not have the select box for authors and no unique index. (You may want to create a unique index on the author's first and last name columns to prevent duplicates there too, but we will leave this up to you.)

Let's call this page editAuthor.php. Here is its source code:

* This page allows to add or edit an author
* PDO Library Management example application
* @author Dennis Popel
// Don't forget the include
// See if we have the author ID passed in the request
$id = (int)$_REQUEST['author'];
if($id) {
// We have the ID, get the author details from the table
$q = $conn->query("SELECT * FROM authors WHERE id=$id");
$author = $q->fetch(PDO::FETCH_ASSOC);
$q = null;
else {
// We are creating a new book
$author = array();
// Now see if the form was submitted...