PHP, MySQL and the PEAR Database - PEAR error reporting
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The function DB::isError will check to see whether the result that's been returned to you is an error or not. If it is an error, you can use DB::errorMessage to return a text description of the error that was generated. You need to pass DB::errorMessage the return value from your function as an argument.
Here you rewrite the PEAR code to use error checking:
<?php
if ( DB::isError( $demoResult = $db->query( $sql)))
{
echo DB::errorMessage($demoResult);
} else {
while ($demoRow = $demoResult->fetchRow()) {
echo $demoRow[2] . '<br />';
}
}
?>
Now that you have a good handle on connecting to the database and the various functions of PEAR, we're going to talk about forms. Forms provide a way to send substantial data from the user to the server where it can be processed.
Chapter 9 Questions
Question 9-1. Create a PEAR-style connect string to connect to this database:
hostname: oreilly.com
database name: survey
username: joe
password: my$ql
Question 9-2. Using the parameters in Question 9-1, write the non-PEAR PHP code to connect to a database and select the instance.
Question 9-3. Using the connection from Question 9-2, write the non-PEAR PHP code to fetch and display the results of the query select * from authors;.
Question 9-4. What are the advantages of using PEAR?
See the Appendix for the answers to these questions.
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 This article is excerpted from chapter 9 of Learning PHP and MySQL, written by Michele Davis and Jon Phillips (O'Reilly, 2006; ISBN: 0596101104). Check it out today at your favorite bookstore. Buy this book now.
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