from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker



# 数据库引擎
engine = create_engine("mysql+pymysql://root:123456@localhost/fastapi0914")
# 会话工厂
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base=declarative_base()

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()