Our framework must have a data abstraction layer to facilitate database operations painlessly. We are going to provide support to three popular databases: SQLite, PostgreSQL, and MySQL. Here is the code of our data abstraction layer in core/main/db.php:
<?
include_once("dbdrivers/abstract.dbdriver.php");
class db
{
private $dbengine;
private $state = "development";
public function __construct()
{
$config = loader::load("config");
$dbengineinfo = $config->db;
if (!$dbengineinfo['usedb']==false)
{
$driver = $dbengineinfo[$this->state]['dbtype'].'driver';
include_once("dbdrivers/{$driver}.php");
$dbengine = new $driver($dbengineinfo[$this->state]);
$this->dbengine = $dbengine;
}
}
public function setDbState($state)
{
//must be 'development'/'production'/'test' or whatever
if (empty($this->dbengine)) return 0;
$config = loader::load("config");
$dbengineinfo = $config->db;...