/**
* Constructor.
* @param null $db
* @param null $config
*/
public function __construct($db = null, $config = null)
{
// Set a name
if ($db !== null) {
$this->db = $db;
} else {
$this->db = 'default';
}
// Initialize a new DB object
$this->db = Database_Init::instance((string) $this->db, $config);
}
/**
* Get sa singleton instance.
* @param string $name
* @param null $config
* @return mixed
* @throws Exception_Exido
*/
public static function &instance($name = 'default', $config = null)
{
if (!isset(self::$instances[$name])) {
// Get the DB settings
if ($config == null) {
$config = @Exido::config('database')->{$name};
}
if (!isset($config['type'])) {
throw new Exception_Exido("DB instance %s doesn't supported by the system", array($name));
}
// Merge a default configuration with user's configuration
self::$_config = array_merge(self::$_config, $config);
if (is_file(SYSPATH . 'database/driver/' . self::$_config['type'] . '/adapter.php')) {
// Initialize a driver
include_once 'database/driver/' . self::$_config['type'] . '/adapter.php';
$driver = 'Database_Driver_' . ucfirst(self::$_config['type']) . '_Adapter';
self::$instances[$name] = new $driver(self::$_config);
} else {
throw new Exception_Exido("Driver :driver doesn't exist", array('database/driver/' . self::$_config['type'] . '/adapter.php'));
}
}
return self::$instances[$name];
}
