Sample code from this class

RWW Class

$config = array('db'=>'rhamilton', 'host'=>'localhost', 'password'=>'q:4PYFRVuzV:htNP', 'username'=>'rhamilton');


class ReadWriteWeb {

	var $hdb;

	function __construct()
	{
		global $config;
	
		$this->hdb = mysql_connect($config['host'], $config['username'], $config['password']);
		mysql_select_db('rhamilton')or die('Failed');
	}

	function ReadWriteWeb()
	{
		$this->__construct();
	}

	function getStudents($id=null)
	{
		$student_array = array();
		if($id)
		{
			$query = 'SELECT * FROM `students` WHERE id="'.addslashes($id).'" ORDER BY name ASC';
		} else {
			$query = 'SELECT * FROM `students` ORDER BY name ASC';
		}
		$students = mysql_query($query);
		
		while($associated = mysql_fetch_assoc($students))
		{
			$student_array[] = $associated;
		}
		
		return $student_array;
	}
	
	function saveStudent($data)
	{
		if(isset($data['active']) && $data['active']=='on') {
			$active = 1;
		} else {
			$active = 0;
		}
		
		if(strlen($data['name'])>3)
		{
			$name = addslashes($data['name']);
		} else {
			return false;
			exit();
		}
		
		$bio = addslashes($data['bio']);
		$url = addslashes($data['url']);
		
		if(!isset($data['id']))
		{
			mysql_query('INSERT INTO `students` VALUES(NULL, "'.$active.'", "'.$name.'", "'.$bio.'", "'.$url.'")');
		} else {
			$id = addslashes($data['id']);
			$query = 'UPDATE `students` SET(id="'.$id.'", active="'.$active.'", name="'.$name.'", bio="'.$bio.'", url="'.$url.'")';
			mysql_query($query);
			var_dump(mysql_error());
		}
		return true;
	}
	
	function deleteStudent($id)
	{
		
	}
}

Edit Page

require_once('libraries/config.php');

require_once('libraries/class.ReadWriteWeb.php');


$rww = new ReadWriteweb();

if(!empty($_POST))
{
	$result = $rww->saveStudent($_POST);
	
	if(!$result)
	{
		$error = true;
	}
	$student = $rww->getStudents($_POST['id']);
	
} else {
	$student = $rww->getStudents($_GET['id']);
}
?>
<form action="edit.php?id=<?php echo $_GET['id']; ?>" method="post">
	 
	 <?php if(isset($error)) { ?>
	 <div class="error_msg">
	 	Whoops, there was a problem with the form below.
	 </div>
	 <?php } ?>
	<input type="hidden" name="id" id="id" value="<?php echo $student[0]['id']; ?>" />
	 
	<div class="input">
		<label for="name">Name</label>
		<input type="text" name="name" id="name" value="<?php echo $student[0]['name']; ?>" />
	</div>
	
	<div>
		<label for="active">Active?</label>
		<input type="checkbox" id="active" name="active" <?php if($student[0]['active']==1) { echo 'checked'; } ?> />
	</div>
	
	<div class="input">
		<label for="url">URL</label>
		<input type="text" id="url" name="url" value="<?php echo $student[0]['url']?>" />
	</div>
	
	<div>
		<label for="bio">Bio</label>
		<textarea name="bio" id="bio"><?php echo $student[0]['bio']?></textarea>
	</div>
	
	<div>
		<input type="submit" value="submit" />
	</div>

New Page

<?php

require_once('libraries/config.php');

require_once('libraries/class.ReadWriteWeb.php');


$rww = new ReadWriteweb();

if(!empty($_POST))
{
	$result = $rww->saveStudent($_POST);
	
	if(!$result)
	{
		$error = true;
	}
	
}
?>
<form action="demo2.php" method="post">
	 
	 <?php if(isset($error)) { ?>
	 <div class="error_msg">
	 	Whoops, there was a problem with the form below.
	 </div>
	 <?php } ?>
	 
	<div class="input">
		<label for="name">Name</label>
		<input type="text" name="name" id="name" />
	</div>
	
	<div>
		<label for="active">Active?</label>
		<input type="checkbox" id="active" name="active" />
	</div>
	
	<div class="input">
		<label for="url">URL</label>
		<input type="text" id="url" name="url" />
	</div>
	
	<div>
		<label for="bio">Bio</label>
		<textarea name="bio" id="bio"></textarea>
	</div>
	
	<div>
		<input type="submit" value="submit" />
	</div>

</form>