69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
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from sqlalchemy.orm import declarative_base
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from .settings import get_settings
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import os
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settings = get_settings()
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# 检测是否使用测试环境（SQLite）
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IS_TEST = settings.DEBUG or os.getenv("USE_SQLITE", "false").lower() == "true"
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if IS_TEST:
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# 测试环境使用SQLite
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DATABASE_URL = "sqlite+aiosqlite:///:memory:"
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else:
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# 生产环境使用MySQL
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DATABASE_URL = (
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f"mysql+aiomysql://{settings.DB_USER}:{settings.DB_PASSWORD}"
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f"@{settings.DB_HOST}:{settings.DB_PORT}/{settings.DB_NAME}"
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f"?charset={settings.DB_CHARSET}"
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)
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engine = create_async_engine(DATABASE_URL, echo=settings.DEBUG, future=True)
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AsyncSessionLocal = async_sessionmaker(
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engine, class_=AsyncSession, expire_on_commit=False
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)
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Base = declarative_base()
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async def get_db():
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"""获取数据库会话的依赖项函数
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用于FastAPI依赖注入，自动管理数据库会话的生命周期
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成功时自动提交，异常时自动回滚，最后确保关闭会话
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第一次调用时自动创建表结构
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"""
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async with AsyncSessionLocal() as session:
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try:
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# 检查表是否存在，如果不存在则创建
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from sqlalchemy import inspect, text
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from src.models.user import User
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from src.models.project import Project
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inspector = inspect(engine)
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existing_tables = inspector.get_table_names()
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if "users" not in existing_tables:
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async with engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all, tables=[User.__tablename__])
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elif "projects" not in existing_tables:
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async with engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all, tables=[Project.__tablename__])
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yield session
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await session.commit()
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except Exception:
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await session.rollback()
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raise
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finally:
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await session.close()
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async def init_db():
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"""初始化数据库，创建所有表结构"""
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async with engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all)
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