feat:增加知识库数据接口

database.py

@@ -0,0 +1,27 @@
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
+from sqlalchemy.orm import declarative_base, sessionmaker
+from dotenv import load_dotenv
+import os
+
+load_dotenv()
+
+DATABASE_URL = os.getenv("DATABASE_URL")
+
+engine = create_async_engine(
+    DATABASE_URL,
+    echo=True,
+    future=True
+)
+
+AsyncSessionLocal = sessionmaker(
+    bind=engine,
+    class_=AsyncSession,
+    expire_on_commit=False
+)
+
+Base = declarative_base()
+
+
+async def get_db():
+    async with AsyncSessionLocal() as session:
+        yield session