evaluates RDBC URL to selects a Driver. no instance. class methods only.
registerDriver(driver)
register a Driver. RDBC user should not call it. Driver#initialize calls.
deregisterDriver(driver)
deregister a Driver. RDBC user should not call it.
getConnection(url, prop)
getDriver and thedriver.createConnection.
getDriver(url)
find a driver with url. returns nil if not found.
getDrivers
returns an array of all registered drivers.