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75 lines
2.8 KiB
Python
75 lines
2.8 KiB
Python
"""
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数据库连接池模块
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"""
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from pathlib import Path
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from databases import Database
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from sqlalchemy import create_engine, MetaData
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# from sqlalchemy.orm import sessionmaker # 不再需要
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from sqlalchemy.ext.declarative import declarative_base
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from app.config.config import settings
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from app.log.logger import get_database_logger
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logger = get_database_logger()
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# 数据库URL
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if settings.DATABASE_TYPE == "sqlite":
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# 确保 data 目录存在
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data_dir = Path("data")
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data_dir.mkdir(exist_ok=True)
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db_path = data_dir / settings.SQLITE_DATABASE
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DATABASE_URL = f"sqlite:///{db_path}"
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elif settings.DATABASE_TYPE == "mysql":
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if settings.MYSQL_SOCKET:
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DATABASE_URL = f"mysql+pymysql://{settings.MYSQL_USER}:{settings.MYSQL_PASSWORD}@/{settings.MYSQL_DATABASE}?unix_socket={settings.MYSQL_SOCKET}"
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else:
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DATABASE_URL = f"mysql+pymysql://{settings.MYSQL_USER}:{settings.MYSQL_PASSWORD}@{settings.MYSQL_HOST}:{settings.MYSQL_PORT}/{settings.MYSQL_DATABASE}"
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else:
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raise ValueError("Unsupported database type. Please set DATABASE_TYPE to 'sqlite' or 'mysql'.")
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# 创建数据库引擎
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# pool_pre_ping=True: 在从连接池获取连接前执行简单的 "ping" 测试，确保连接有效
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engine = create_engine(DATABASE_URL, pool_pre_ping=True)
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# 创建元数据对象
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metadata = MetaData()
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# 创建基类
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Base = declarative_base(metadata=metadata)
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# 创建数据库连接池，并配置连接池参数，在sqlite中不使用连接池
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# min_size/max_size: 连接池的最小/最大连接数
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# pool_recycle=3600: 连接在池中允许存在的最大秒数（生命周期）。
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# 设置为 3600 秒（1小时），确保在 MySQL 默认的 wait_timeout (通常8小时) 或其他网络超时之前回收连接。
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# 如果遇到连接失效问题，可以尝试调低此值，使其小于实际的 wait_timeout 或网络超时时间。
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# databases 库会自动处理连接失效后的重连尝试。
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if settings.DATABASE_TYPE == "sqlite":
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database = Database(DATABASE_URL)
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else:
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database = Database(DATABASE_URL, min_size=5, max_size=20, pool_recycle=1800) # Reduced recycle time to 30 mins
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# 移除了 SessionLocal 和 get_db 函数
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# --- Async connection functions for lifespan/async routes ---
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async def connect_to_db():
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"""
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连接到数据库
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"""
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try:
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await database.connect()
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logger.info(f"Connected to {settings.DATABASE_TYPE}")
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except Exception as e:
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logger.error(f"Failed to connect to database: {str(e)}")
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raise
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async def disconnect_from_db():
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"""
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断开数据库连接
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"""
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try:
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await database.disconnect()
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logger.info(f"Disconnected from {settings.DATABASE_TYPE}")
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except Exception as e:
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logger.error(f"Failed to disconnect from database: {str(e)}")
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