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

db_url = "mysql+pymysql://root:123456@127.0.0.1:3306/ai111?charset=utf8mb4"
engine = create_engine(db_url)

Base = declarative_base()

Session = sessionmaker(bind=engine
                       , autoflush=False
                       , autocommit=False
                       )


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