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Displaying the Database - PHP

Concluding our discussion of databases and PHP, we'll finish building the example that we started last week. This article is excerpted from chapter eight of the book Programming PHP, Second Edition, written by Kevin Tatroe, Rasmus Lerdorf, and Peter MacIntyre (O'Reilly, 2006; ISBN: 0596006810). Copyright 2006 O'Reilly Media, Inc. All rights reserved. Used with permission from the publisher. Available from booksellers or direct from O'Reilly Media.

TABLE OF CONTENTS:
  1. Databases: Finishing a Listing Service
  2. Adding a Business
  3. Displaying the Database
  4. PHP Data Objects
  5. PDO and prepared statements
By: O'Reilly Media
Rating: starstarstarstarstar / 2
July 05, 2007

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Example 8-6 shows a page that displays the information in the database. The links on the left side of the page are created from the categories table and link back to the script, adding a category ID. The category ID forms the basis for a query on the businesses table and the biz_categories table.

Example 8-6.  Business listing page

<html>
<head>
<title>
<?php
 
$doc_title = 'Business Listings';
 
echo "$doc_title\n";
?>
</title>
</head>
<body>
<h1>
<?= $doc_title ?>
</h1>

<?php
 // establish the database connection

 require_once('db_login.php');

 $pick_message = 'Click on a category to find business listings:';
?>

<table border=0>
<tr><td valign="top">
    <table border=5>
    <tr><td class="picklist"><strong><?= $pick_message ?></strong></td></tr>
   
<p>
   
<?php
     // build the scrolling pick list for the categories
     $sql = "SELECT * FROM categories";
     $result = $db->query($sql);
     if (DB::isError($result)) die($result->getMessage());
     while ($row = $result->fetchRow()){
         if (DB::isError($row)) die($row->getMessage());
         echo '<tr><td class="formlabel">';
         echo "<a href="$PHP_SELF?cat_id=$row[0]">";
         echo "$row[1]</a></td></tr>\n";
     }
    ?>
    </table>
</td>
<td valign="top">
     <table border=1>
     <?php

     if ($cat_id) {
       $sql = "SELECT * FROM businesses b, biz_categories bc where";
       $sql .= " category_id = '$cat_id'";
       $sql .= " and b.business_id = bc.business_id";
       $result = $db->query($sql);
       if (DB::isError($result)) die($result->getMessage());
       while ($row = $result->fetchRow()){
        
if (DB::isError($row)) die($row->getMessage());
        
if ($color == 1) {
           $bg_shade = 'dark';
           $color = 0;
         } else {
           $bg_shade = 'light';
           $color = 1;
        
}
         echo "<tr>\n";
         for($i = 0; $i < count($row); $i++) {
           echo "<td class="$bg_shade">$row[$i]</td>\n";
         }
         echo "</tr>\n";
     
}
    }
   ?>
   </table>
</td></tr>
</table>
</body>
</html>

The business listings page is illustrated in Figure 8-7.


Figure 8-7.  Business Listings page



 
 
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