fix(export): show all dameng databases in export dropdown

apps/desktop/src/composables/__tests__/useDatabaseOptions.spec.ts

@@ -177,16 +177,17 @@ describe("namespace options", () => {
     expect(namespaceOptionsAreSchemas({ db_type: "postgres" })).toBe(false);
   });
 
-  it("does not expand the global database options composable to Dameng schemas", async () => {
+  it("expands Dameng schemas via listSchemas", async () => {
     mocks.getConfig.mockReturnValue({ db_type: "dameng" });
-    mocks.listDatabases.mockResolvedValue([]);
+    mocks.listSchemas.mockResolvedValue(["APP_USER", "REPORTING", "SYS"]);
 
     const { databaseOptions, loadDatabaseOptions } = useDatabaseOptions();
     await loadDatabaseOptions("connection-1");
 
-    expect(databaseOptions.value["connection-1"]).toEqual([]);
-    expect(mocks.listDatabases).toHaveBeenCalledWith("connection-1");
-    expect(mocks.listSchemas).not.toHaveBeenCalled();
+    // 达梦现在通过 listSchemas 获取 schema 列表，SYS 作为系统 schema 被过滤掉
+    expect(databaseOptions.value["connection-1"]).toEqual(["APP_USER", "REPORTING"]);
+    expect(mocks.listSchemas).toHaveBeenCalledWith("connection-1", "", true);
+    expect(mocks.listDatabases).not.toHaveBeenCalled();
   });
 });
 

apps/desktop/src/composables/useDatabaseOptions.ts

@@ -96,6 +96,9 @@ export function useDatabaseOptions() {
         );
       } else if (connection.db_type === "mongodb") {
         databaseOptions.value[connectionId] = filterDatabaseNamesForConnection(await api.mongoListDatabases(connectionId), connection);
+      } else if (connection.db_type === "dameng") {
+        // 达梦的"数据库"概念对应 schema，使用 listSchemas 获取 schema 列表
+        databaseOptions.value[connectionId] = await fetchNamespaceOptionsForConnection(connectionId, connection);
       } else if (catalog && isDorisFamilyCatalogCapable(connection?.db_type, connection?.driver_profile)) {
         const dbs = await api.listDorisCatalogDatabases(connectionId, catalog);
         databaseOptions.value[connectionId] = databaseOptionsForConnection(