115 lines
3.7 KiB
Python
115 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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# @version : 1.0
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# @Update Time : 2023/8/18 9:00
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# @File : database.py
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# @IDE : PyCharm
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# @desc : SQLAlchemy 部分
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"""
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导入 SQLAlchemy 部分
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安装： pip install sqlalchemy[asyncio]
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官方文档：https://docs.sqlalchemy.org/en/20/intro.html#installation
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"""
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from typing import AsyncGenerator
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from aioredis import Redis
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from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker, AsyncAttrs
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from sqlalchemy.orm import DeclarativeBase, declared_attr
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from application.settings import SQLALCHEMY_DATABASE_URL, REDIS_DB_ENABLE, MONGO_DB_ENABLE
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from fastapi import Request
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from core.exception import CustomException
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from motor.motor_asyncio import AsyncIOMotorDatabase
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def create_async_engine_session(database_url: str) -> async_sessionmaker[AsyncSession]:
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"""
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创建数据库会话
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相关配置文档：https://docs.sqlalchemy.org/en/14/core/engines.html#database-urls
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database_url dialect+driver://username:password@host:port/database
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max_overflow 超过连接池大小外最多创建的连接
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pool_size=5, # 连接池大小
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pool_timeout=20, # 池中没有连接最多等待的时间，否则报错
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pool_recycle=-1 # 多久之后对线程池中的线程进行一次连接的回收（重置）
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:param database_url: 数据库地址
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:return:
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"""
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async_engine = create_async_engine(
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database_url,
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echo=False,
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pool_pre_ping=True,
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pool_recycle=3600,
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future=True,
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max_overflow=5,
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connect_args={}
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)
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return async_sessionmaker(
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autocommit=False,
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autoflush=False,
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bind=async_engine,
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expire_on_commit=True,
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class_=AsyncSession
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)
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class Base(AsyncAttrs, DeclarativeBase):
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"""
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创建基本映射类
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稍后，我们将继承该类，创建每个 ORM 模型
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"""
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@declared_attr.directive
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def __tablename__(cls) -> str:
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"""
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将表名改为小写
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如果有自定义表名就取自定义，没有就取小写类名
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"""
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table_name = cls.__tablename__
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if not table_name:
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model_name = cls.__name__
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ls = []
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for index, char in enumerate(model_name):
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if char.isupper() and index != 0:
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ls.append("_")
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ls.append(char)
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table_name = "".join(ls).lower()
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return table_name
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async def db_getter() -> AsyncGenerator[AsyncSession, None]:
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"""
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获取主数据库
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数据库依赖项，它将在单个请求中使用，然后在请求完成后将其关闭。
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函数的返回类型被注解为 AsyncGenerator[int, None]，其中 AsyncSession 是生成的值的类型，而 None 表示异步生成器没有终止条件。
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"""
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async with create_async_engine_session(SQLALCHEMY_DATABASE_URL)() as session:
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# 创建一个新的事务，半自动 commit
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async with session.begin():
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yield session
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def redis_getter(request: Request) -> Redis:
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"""
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获取 redis 数据库对象
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全局挂载，使用一个数据库对象
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"""
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if not REDIS_DB_ENABLE:
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raise CustomException("请先配置Redis数据库链接并启用！", desc="请启用 application/settings.py: REDIS_DB_ENABLE")
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return request.app.state.redis
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def mongo_getter(request: Request) -> AsyncIOMotorDatabase:
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"""
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获取 mongo 数据库对象
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全局挂载，使用一个数据库对象
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"""
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if not MONGO_DB_ENABLE:
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raise CustomException(msg="请先开启 MongoDB 数据库连接！", desc="请启用 application/settings.py: MONGO_DB_ENABLE")
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return request.app.state.mongo
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