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Relational Databases - Comparison of approaches
Using MySQL Databases in PHP Pages example from a Well House Consultants training course
More on Using MySQL Databases in PHP Pages [link]

This example is described in the following article(s):
   • MySQL, MySQLi, PDO or something else - how best to talk to databases from PHP - [link]
   • Moving from mysql to mysqli - simple worked example - [link]

If you're searching for a page where you can try this code, select here

This example references the following resources:

Source code: approach.php Module: H113

# Relational Databases - Comparison of approaches

# 1. "mysql" routines - structured programming approach

$q mysql_query("select * from mt_entry order by entry_id desc limit 0,5");
$html1 "";
while (
$row mysql_fetch_assoc($q)) {
$html1 .= "<a href=http://wellho.info/".$row['entry_id'].">[link]</a> ";
$html1 .= $row['entry_title']."<br />\n";

# 2. "mysqli" routines - structured programming approach

$connect mysqli_connect("","wellho","secret","wellho");
$q mysqli_query($connect,"select * from mt_entry order by entry_id desc limit 10,5");
$html2 "";
while (
$row mysqli_fetch_object($q)) {
$html2 .= "<a href=http://wellho.info/".$row->entry_id.">[link]</a> ";
$html2 .= $row->entry_title."<br />\n";

# 3. "mysqli" routines - object oriented approach

$connect = new mysqli("","wellho","secret","wellho");
$q $connect->query("select * from mt_entry order by entry_id desc limit 20,5");
$html3 "";
while (
$row $q->fetch_object()) {
$html3 .= "<a href=http://wellho.info/".$row->entry_id.">[link]</a> ";
$html3 .= $row->entry_title."<br />\n";

# 4. SQLite routines - object oriented approach
# Note - data source is from a different set of tables. Would look like this:

/* $db = new SQLiteDatabase('/home/wellho/include/sqlitedemodata');
$q = $db->query("select * from mt_entry order by entry_id desc");
while ($row = $q->fetch_object()) {
        $html4 .= "<a href=http://wellho.info/".$row->entry_id.">[link]</a> ";
        $html4 .= $row->entry_title."<br />\n";
$db->close(); */

# 5.  PDO

$dsn 'mysql:dbname=wellho;host=';
$user 'wellho'$password 'secret';
$dbh = new PDO($dsn$user$password);

$query $dbh->prepare("select * from mt_entry order by entry_id desc limit 30,5");
$html5 "";
while (
$row $query->fetch()){
$html5 .= "<a href=http://wellho.info/".$row['entry_id'].">[link]</a> ";
$html5 .= $row['entry_title']."<br />\n";

<title>MySQL, MySQLi and PDO - comparative demo</title>
<h1> MySQL, MySQLi and PDO Compared</h1>
<?= $html1 ?>
<h4>MySQLi - structured approach</h4>
<?= $html2 ?>
<h4>MySQLi - Object approach</h4>
<?= $html3 ?>
<h4>PDO (accessing the same MySQL database in this case)</h4>
<?= $html5 ?>
<br />
The four sections above show the outputs from four separate database
connections and data accesses - each does essentially the same thing
but in a very different way (we have selected to look at records
which are current, from last week, and the week before to make it
a bit more interesting).  There will be a "view source" button below
if you're looking at this script on our live training server ...
so you can examine and compare the code.

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in PHP
 * PHP Programming
 * MySQL
 * PHP Programming
 * Learning to program in PHP
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering PHP are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Using MySQL Databases in PHP Pages" training module. You'll find a description of the topic and some other closely related examples on the "Using MySQL Databases in PHP Pages" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

Web site author
This web site is written and maintained by Well House Consultants.

Conditions of use
Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.

This program is copyright Well House Consultants Ltd. You are forbidden from using it for running your own training courses without our prior written permission. See our page on courseware provision for more details.

Any of our images within this code may NOT be reused on a public URL without our prior permission. For Bona Fide personal use, we will often grant you permission provided that you provide a link back. Commercial use on a website will incur a license fee for each image used - details on request.

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