/**
* Return the global unique instance of DBConnector.
*
* @param string $sIncDir The base include path of the system. [optional, default=INC_DIR]
*
* @return DBConnector
*
* @throws Exception
*/
public static function getInstance()
{
if (!isset(self::$aInstances) || !self::$aInstances instanceof DBConnector) {
self::$aInstances = new DBConnector();
}
return self::$aInstances;
}