feat(core): Support multi round conversation operator (#986)

dbgpt/storage/metadata/db_factory.py

@@ -0,0 +1,21 @@
+from dbgpt.component import SystemApp, BaseComponent, ComponentType
+
+from .db_manager import DatabaseManager
+
+
+class UnifiedDBManagerFactory(BaseComponent):
+    name = ComponentType.UNIFIED_METADATA_DB_MANAGER_FACTORY
+
+    def __init__(self, system_app: SystemApp, db_manager: DatabaseManager):
+        super().__init__(system_app)
+        self._db_manager = db_manager
+
+    def init_app(self, system_app: SystemApp):
+        pass
+
+    def create(self) -> DatabaseManager:
+        if not self._db_manager:
+            raise RuntimeError("db_manager is not initialized")
+        if not self._db_manager.is_initialized:
+            raise RuntimeError("db_manager is not initialized")
+        return self._db_manager