Learning PHP Data Objects: A Beginner's Guide to PHP Data Objects, Database Connection Abstraction Library for PHP 5

Learning PHP Data Objects: A Beginner's Guide to PHP Data Objects, Database Connection Abstraction Library for PHP 5

Dennis Popel

Language: English

Pages: 116

ISBN: 2:00097487

Format: PDF / Kindle (mobi) / ePub

This book starts with an overview of PHP Data Objects (PDO), followed by getting started with PDO. Then it covers error handling, prepared statements, and handling rowsets, before covering advanced uses of PDO and an example of its use in an MVC application. Finally an appendix covers the new object-oriented features of PHP 5. This book will guide you through the data layer abstraction objects in PHP. PHP developers who need to use PDO for data abstraction.

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row), but PDO offers several styles. This class can also provide additional information about a result set, such as the number of rows and columns, and fetch the whole result set into a two-dimensional array. Let's begin by looking at some different fetch styles. We already know the PDO::FETCH_ASSOC mode that returns an array indexed by column name. The default operation of the PDOStatement object is to return an array indexed by both an integer index and a column name, that is the

failures. Chapter 5 helps us determine the number of rows in the returned result set. Also, we come across a new concept—scrollable cursors, which allow us to fetch subsets of rows from a result set. Chapter 6 talks about advanced uses of PDO and includes setting connection parameters, transactions, and methods of PDO and the PDOStatement class. Chapter 7 gives an example, where creation of the method part of an MVC application is discussed. Appendix A explains the object-oriented features

use the row count to enhance user experience by, for example, paginating long result sets. Our example library application is still quite small, with only three books so far, but as our database grows, we surely will need some tools to get the total row count for every table displayed and paginate it for easy browsing. Traditionally, you would use the mysql_num_rows(), sqlite_num_rows() function or the pg_num_rows() function (depending on your database) to get the total number of rows returned

if(is_uploaded_file($_FILES['cover']['tmp_name'])) { // See if the file is an image if(!preg_match('~image/.+~', $_FILES['cover']['type']) || filesize($_FILES['cover']['tmp_name']) > 24000) { $warnings[] = 'Please upload an image file less than 24K in size'; } else { // Set a flag that upload is successful $uploadSuccess = true; } } // If there are no errors, we can update the database // If there was book ID passed, update that book if(count($warnings) == 0) { if(@$book['id']) { $sql = "UPDATE

these errors:
"; foreach($warnings as $w) { echo "- ", htmlspecialchars($w), "
"; } } // Now display the form ?>

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