fdc098d0db
- 修复异常处理链，使用from语法保留原始异常 - 格式化代码以符合项目规范 - 优化导入模块的顺序 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
import os
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from pymongo import MongoClient
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from pymongo.database import Database
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_client = None
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_db = None
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def __create_database_instance():
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uri = os.getenv("MONGODB_URI")
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host = os.getenv("MONGODB_HOST", "127.0.0.1")
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port = int(os.getenv("MONGODB_PORT", "27017"))
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# db_name 变量在创建连接时不需要，在获取数据库实例时才使用
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username = os.getenv("MONGODB_USERNAME")
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password = os.getenv("MONGODB_PASSWORD")
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auth_source = os.getenv("MONGODB_AUTH_SOURCE")
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if uri and uri.startswith("mongodb://"):
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# 优先使用URI连接
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return MongoClient(uri)
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if username and password:
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# 如果有用户名和密码，使用认证连接
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return MongoClient(host, port, username=username, password=password, authSource=auth_source)
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# 否则使用无认证连接
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return MongoClient(host, port)
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def get_db():
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"""获取数据库连接实例，延迟初始化。"""
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global _client, _db
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if _client is None:
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_client = __create_database_instance()
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_db = _client[os.getenv("DATABASE_NAME", "MegBot")]
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return _db
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class DBWrapper:
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"""数据库代理类，保持接口兼容性同时实现懒加载。"""
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def __getattr__(self, name):
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return getattr(get_db(), name)
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def __getitem__(self, key):
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return get_db()[key]
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# 全局数据库访问点
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db: Database = DBWrapper()
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