[backend] feat: 添加项目基础配置

backend/config/database.py

@@ -0,0 +1,36 @@
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import declarative_base
+from .settings import get_settings
+
+settings = get_settings()
+
+DATABASE_URL = (
+    f"mysql+aiomysql://{settings.DB_USER}:{settings.DB_PASSWORD}"
+    f"@{settings.DB_HOST}:{settings.DB_PORT}/{settings.DB_NAME}"
+    f"?charset={settings.DB_CHARSET}"
+)
+
+engine = create_async_engine(DATABASE_URL, echo=settings.DEBUG, future=True)
+
+AsyncSessionLocal = async_sessionmaker(
+    engine, class_=AsyncSession, expire_on_commit=False
+)
+
+Base = declarative_base()
+
+
+async def get_db():
+    async with AsyncSessionLocal() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()
+
+
+async def init_db():
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)