text: from sqlalchemy import create_engine
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.orm import sessionmaker, scoped_session
  import config
  
  SQLALCHEMY_DATABASE_URL = 'sqlite:///test.db'
  if config.MYSQL_CONNECTION_URL is not None:
      print("Using MySQL")
      SQLALCHEMY_DATABASE_URL = config.MYSQL_CONNECTION_URL
  elif config.POSTGRES_CONNECTION_URL is not None:
      print("Using postgres")
      SQLALCHEMY_DATABASE_URL = config.POSTGRES_CONNECTION_URL
  else:
      print("Using SQLLITE")
  
  engine = create_engine(SQLALCHEMY_DATABASE_URL, pool_pre_ping=True)
  SessionLocal = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine))
  
  Base = declarative_base()
  
  
  # Dependency
  def get_db():
      try:
          db = SessionLocal()
          yield db
      finally:
          db.close()
  