import datetime

class MySQLStore:

  def connect(self):
    print('connect to mysql database')

  def serialize(self, first_name: str , last_name: str, birth: datetime, hourly_rate: int, labor_hours: int):
    print('serialized data to mysql database')

class Employee:

  // ...

  def save(self):
    db = MySQLStore()
    db.connect()
    db.serialize(self._first_name, self._last_name, self.birth, self._hourly_rate, self._labor_hours)