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

class_management_rul = "mysql+pymysql://root:123456@localhost:3306/student_manage_system?charset=utf8mb4"

engine = create_engine(class_management_rul)
SessionLocal = sessionmaker(bind=engine,autocommit=False, autoflush=False)
Base = declarative_base()

# 获取数据库会话依赖

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