from sqlalchemy.orm import sessionmaker
from sqlalchemy import create_engine
from config import get_config

Config = get_config()

LocalSession = sessionmaker(autocommit=False, autoflush=False, bind=create_engine(Config.SQLALCHEMY_DATABASE_URI))

#返回一个数据库连接
def get_db(): 
    db = LocalSession()
    try:
        yield db
    finally:
        db.close()