diff --git a/Server/Application.cpp b/Server/Application.cpp
index 9b4be81..f9115e3 100644
--- a/Server/Application.cpp
+++ b/Server/Application.cpp
@@ -163,7 +163,7 @@ Application::Application(const std::string &path)
             }
             database->add(std::move(record));
         }
-
+        Wt::Dbo::Transaction transaction(*database);
         boost::json::object reply;
         reply["page_view_count"] =  database->query<int>("SELECT COUNT(*) FROM visitor_record WHERE url = ?").bind(std::string(url));
         reply["unique_visitor_count"] = database->query<int>("SELECT COUNT(DISTINCT visitor_uuid) FROM visitor_record WHERE url = ?").bind(std::string(url));
@@ -195,6 +195,7 @@ Application::Application(const std::string &path)
             }
         }
         auto database = Database::session();
+        Wt::Dbo::Transaction transaction(*database);
         Wt::Dbo::collection<std::tuple<std::string, int>> query = database->query<std::tuple<std::string, int>>("SELECT url, COUNT(*) as count FROM visitor_record GROUP BY url ORDER BY count DESC LIMIT ?").bind(size);
         boost::json::array reply;
         for (auto &[url, count] : query) {
@@ -229,6 +230,7 @@ Application::Application(const std::string &path)
             }
         }
         auto database = Database::session();
+        Wt::Dbo::Transaction transaction(*database);
         using Reslut = std::tuple<std::string, system_clock::time_point>;
         Wt::Dbo::collection<Reslut> query = database->query<Reslut>("SELECT url, MAX(time) FROM visitor_record GROUP BY url ORDER BY MAX(time) DESC LIMIT ?").bind(size);
         boost::json::array reply;