from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base

# 数据库连接字符串
SQLALCHEMY_DATABASE_URL = "mysql+pymysql://root:mypassword12@127.0.0.1:3306/lianai"

# 创建数据库引擎
engine = create_engine(SQLALCHEMY_DATABASE_URL)

# 创建会话本地类
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# 声明基类
Base = declarative_base()