student_manage_system/students/databases.py

# databases链接数据库

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

db_url = "mysql+pymysql://root:420821@localhost:3306/student_manage_system?charset=utf8mb4"

engine1 = create_engine(db_url)

Base = declarative_base()

Session = sessionmaker(bind=engine1
                               ,autoflush=False
                               ,autocommit=False)

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