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    "### ORM(Object Relational Mapping)\n",
    "- 데이터베이스 테이블을 파이썬의 클래스로 매핑\n",
    "- 컬럼 == 속성\n",
    "- SQLALchemy 라이브러리가 ORM 지원"
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   },
   "source": "!pip install sqlalchemy",
   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "Requirement already satisfied: sqlalchemy in ./.venv/lib/python3.12/site-packages (2.0.51)\n",
      "Requirement already satisfied: greenlet>=1 in ./.venv/lib/python3.12/site-packages (from sqlalchemy) (3.5.1)\n",
      "Requirement already satisfied: typing-extensions>=4.6.0 in ./.venv/lib/python3.12/site-packages (from sqlalchemy) (4.15.0)\n"
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   "source": [
    "# Users 테이블 (id, name, email)\n",
    "# create table users()\n",
    "from sqlalchemy import Column, Integer, String, create_engine\n",
    "from sqlalchemy.orm import declarative_base, sessionmaker\n",
    "\n",
    "# 데이터베이스 연결\n",
    "engine = create_engine('sqlite:///db/users.db')\n",
    "# engine = create_engine('sqlite:///users.db')\n",
    "\n",
    "# 모든 모델 크래스의 부모 클래스가 될 Base 객체 생성\n",
    "Base = declarative_base()\n",
    "class User(Base):\n",
    "    __tablename__ = 'users'\n",
    "\n",
    "    id = Column(Integer, primary_key=True)\n",
    "    name = Column(String)\n",
    "    email = Column(String, unique=True)\n",
    "\n",
    "    def __str__(self):\n",
    "        return f\"<User(name='{self.name}', email='{self.email}')>\"\n",
    "\n",
    "# 테이블 생성\n",
    "Base.metadata.create_all(engine)"
   ],
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   "outputs": [],
   "execution_count": 2
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