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

db_tea = 'mysql+pymysql://root:123456@127.0.0.1:3306/ai0824?charset=utf8mb4'
engine1 = create_engine(db_tea)

Base = declarative_base()
Session = sessionmaker(bind=engine1
                       ,autoflush = False
                       ,autocommit = False)
def get_db():
    db = Session()
    try:
        yield db
    finally:
        db.close()
Base.metadata.create_all(engine1)