项目结构做成

PythonProject/main.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+

PythonProject/util/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.orm import declarative_base,sessionmaker
+
+db_url = 'mysql+pymysql://root:123456@127.0.0.1:3306/ai0824?charset=utf8mb4'
+engine = create_engine(db_url,pool_size=50)
+Base = declarative_base()
+
+Session = sessionmaker(bind=engine,autoflush=False,autocommit=False)
+db = Session()