112 lines
3.0 KiB
Python
112 lines
3.0 KiB
Python
"""
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数据库连接和会话管理
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"""
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from sqlalchemy import create_engine, event
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from sqlalchemy.orm import sessionmaker
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from sqlalchemy.pool import QueuePool
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from .config import settings
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# 创建数据库引擎，支持MySQL连接池
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db_settings = settings.database
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if "sqlite" in db_settings.DATABASE_URL:
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# SQLite 配置
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engine = create_engine(
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db_settings.DATABASE_URL,
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echo=False,
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future=True,
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connect_args={"check_same_thread": False} # SQLite 特定配置
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)
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else:
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# MySQL 配置
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engine = create_engine(
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db_settings.DATABASE_URL,
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# 连接池配置
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poolclass=QueuePool,
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pool_size=db_settings.DB_POOL_SIZE,
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max_overflow=db_settings.DB_MAX_OVERFLOW,
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pool_timeout=db_settings.DB_POOL_TIMEOUT,
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pool_recycle=db_settings.DB_POOL_RECYCLE,
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pool_pre_ping=True, # 每次使用连接前检测是否有效，防止使用已断开的连接
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echo=False,
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future=True,
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# 设置连接时使用的字符集
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connect_args={
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"charset": "utf8mb4",
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"collation": "utf8mb4_unicode_ci",
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# 添加连接超时设置
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"connect_timeout": 60,
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"read_timeout": 60,
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"write_timeout": 60
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}
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)
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# 如果是MySQL，启用严格模式
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if "mysql" in db_settings.DATABASE_URL:
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@event.listens_for(engine, "connect")
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def set_sqlite_pragma(dbapi_connection, connection_record):
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"""
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为MySQL连接设置参数（如果使用MySQL）
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"""
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# 设置字符集为utf8mb4
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try:
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cursor = dbapi_connection.cursor()
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cursor.execute("SET NAMES utf8mb4 COLLATE utf8mb4_unicode_ci")
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cursor.close()
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except Exception:
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pass
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# 创建会话
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SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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def get_db():
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"""
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获取数据库会话
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"""
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db = SessionLocal()
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try:
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yield db
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except Exception as e:
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# 如果发生异常，先回滚未提交的事务
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try:
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if db.is_active:
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db.rollback()
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except Exception:
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pass
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raise e
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finally:
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# 安全地关闭数据库连接
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try:
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# 检查会话状态
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if db.is_active:
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db.close()
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else:
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# 如果会话已经不活跃，尝试无效化连接
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try:
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db.close()
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except Exception:
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pass
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except Exception:
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# 忽略关闭时的错误，避免掩盖原始异常
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pass
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def create_tables():
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"""
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创建所有表
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"""
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from ..models.base import Base
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from ..models import user, game
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Base.metadata.create_all(bind=engine)
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def drop_tables():
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"""
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删除所有表（仅用于开发环境）
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"""
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from ..models.base import Base
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from ..models import user, game
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Base.metadata.drop_all(bind=engine)
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