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

db_url = 'mysql+pymysql://root:123456@0.0.0.0:3306/ai0824?charset=utf8mb4'
engine = create_engine(db_url,pool_size=50)

Base = declarative_base()

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