Select all records from contacts table.
<?php
  require_once('Class.Database.php');
  $Db = new Database('localhost', 'DATABASE', 'USERNAME', 'PASSWORD');
?>
<?php $contacts = $Db->executeQuery('SELECT * FROM contacts')->asObject(); ?>
  <?php if ($contacts): ?>
    <ul>
      <?php foreach($contacts as $contact): ?>
        <li><?php echo $contact->first_name; ?> <?php echo $contact->last_name; ?></li>
      <?php endforeach; ?>
    </ul>
  <?php else: ?>
  <p>No contacts found.</p>
  <?php endif; ?>
<?php unset($Db); ?>

Insert a record into the contacts table.
<?php
  require_once('Class.Database.php');
  $Db = new Database('localhost', 'DATABASE', 'USERNAME', 'PASSWORD');
?>
<?php $inserted = $Db->executeQuery('INSERT INTO contacts (first_name, last_name, email) VALUES ("Isabella", "Castera", "email@domain.com")')->wasInserted(); ?>
  <?php if ($inserted): ?>
    <p>Contact Isabella inserted with id, <?php echo $inserted; ?></p>
  <?php else: ?>
    <p>No contacts found.</p>
  <?php endif; ?>
<?php unset($Db); ?>

Delete a record from the contacts table.
<?php
  require_once('Class.Database.php');
  $Db = new Database('localhost', 'DATABASE', 'USERNAME', 'PASSWORD');
?>
<?php $deleted = $Db->executeQuery('DELETE FROM contacts WHERE first_name = "Isabella"')->wasDeleted(); ?>
  <?php if ($deleted): ?>
    <p>Contact Isabella deleted.</p>
  <?php else: ?>
    <p>No contacts found.</p>
  <?php endif; ?>
<?php unset($Db); ?>

Update a record in the contacts table.
<?php
  require_once('Class.Database.php');
  $Db = new Database('localhost', 'DATABASE', 'USERNAME', 'PASSWORD');
?>
<?php $updated = $Db->executeQuery('UPDATE contacts SET last_name = "Branson" WHERE first_name = "Richard"')->wasUpdated(); ?>
  <?php if ($updated): ?>
    <p>Contact Richard updated.</p>
  <?php else: ?>
    <p>No contacts found.</p>
  <?php endif; ?>
<?php unset($Db); ?>