/**
* @return Db
*/
public static function getInstance()
{
// Exemplo de Singleton
if (!self::$instance) {
self::$instance = new self();
}
return self::$instance;
}
/**
* 实例化
* @param string $type
* @param array $config
* @return object eg. Ssdb Redis...
*/
public static function getInstance($type, $config)
{
if (!self::$instance instanceof BaseDb) {
$class = 'Database\\' . ucfirst($type);
if (class_exists($type)) {
self::$instance = new $class((array) $config);
} else {
self::$instance = null;
}
}
return self::$instance;
}