importaiomysql pool =Noneasyncdef_init_db_pool():globalpoolifpoolisNone: pool =awaitaiomysql.create_pool( host='127.0.0.1', port=3306, user='root', password='helloworld', db='mydatabase', charset='utf8mb4', autocommit=True, minsize=1, maxsize=10, pool_recycle=3600, )asyncdefget_con...
其中database.py的内容如下: python 1234567891011 # 第一步,导入SQLAlchemy组件包from sqlalchemy import create_enginefrom sqlalchemy.ext.declarative import declarative_basefrom sqlalchemy.orm import sessionmaker# 第二步,创建数据连接引擎engine = create_engine("root:Mysql%4013@127.0.0.1:3306/cat")# 第...
from sqlalchemy import create_engine from sqlalchemy.orm import sessionmaker SQLALCHEMY_DATABASE_URL = "sqlite:///./todos.db" # SQLite数据库文件路径 engine = create_engine( SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False} ) SessionLocal = sessionmaker(autocommit=False, aut...
This can be very useful for setting upresourcesthat you need to use for the whole app, and that aresharedamong requests, and/or that you need toclean upafterwards. For example, a database connection pool, or loading a shared machine learning model. ...
SQLALCHEMY_DATABASE_URI, echo=False, pool_pre_ping=True ) 现在在 src/api 目录下添加一个 deps.py 文件。如果你还不熟悉 FastAPI 的依赖注入系统,可以查阅 官方文档。在这里,我们设置数据库连接,为每个请求使用一个会话,并确保连接在每次请求时都能正确地打开和关闭。 # deps.py from typing import ...
# database.py DATABASE_URL = "postgresql+asyncpg://user:password@localhost/dbname" engine = create_async_engine(DATABASE_URL, echo=True) SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine, class_=AsyncSession) 步骤3: 创建CRUD工具类 现在,创建一个CRUD工具类,封装基本的数...
engine = create_engine(SQLALCHEMY_DATABASE_URL) 1. create_engine 有个pool_recycle参数 此设置会使池在经过给定的秒数后回收连接。它默认为-1,或者没有超时。例如,设置为3600意味着连接将在一小时后回收。请注意,如果在八个小时的连接中没有检测到任何活动, ...
However, since sqlite by definition is a local database, either on-disk or in memory, the benefits from connection pooling are minimal: there is no network delay to opening a file on disk or allocating memory, and disk bandwidth is much higher (and better managed by the kernel). “Connec...
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Breadcrumbs FastApi_Blog /app /Fast_blog /database / databaseconnection.py Latest commit Cannot retrieve latest commit at this time. HistoryHistory File metadata and controls Code Blame 31 lines (23 loc) · 1009 Bytes Raw import os from asyncio import current_task from urllib import parse f...