diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000..fb93c98
--- /dev/null
+++ b/.vscode/c_cpp_properties.json
@@ -0,0 +1,20 @@
+{
+    "configurations": [
+        {
+            "name": "Mac",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [],
+            "macFrameworkPath": [
+                "/System/Library/Frameworks",
+                "/Library/Frameworks"
+            ],
+            "compilerPath": "/usr/bin/clang",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "clang-x64"
+        }
+    ],
+    "version": 4
+}
\ No newline at end of file
diff --git a/src/demo/main.cpp b/src/demo/main.cpp
index 713b665..41ec552 100644
--- a/src/demo/main.cpp
+++ b/src/demo/main.cpp
@@ -1,5 +1,3 @@
-// This is an open source non-commercial project. Dear PVS-Studio, please check it.
-// PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
 #include <influxdb_raw_db_utf8.h>
 #include <influxdb_simple_api.h>
 #include <influxdb_line.h>
@@ -8,50 +6,49 @@
 #include <iostream>
 #include <thread>
 #include <chrono>
+#include <time.h>
+#include <unistd.h>
+#include <sys/time.h>
 
 using namespace influxdb::api;
-
-int main(int argc, char* argv[])
-{
-    try
-    {
-        const char* url = "http://localhost:8086";
-        influxdb::raw::db_utf8 db(url, "demo");
-        influxdb::api::simple_db api(url, "demo");
-        influxdb::async_api::simple_db async_api(url, "demo");
-
-        api.drop();
-        api.create();
-
-        // {"results":[{"series":[{"columns":["name"],"name":"databases","values":[["_internal"],["mydb"]]}]}]}
-        std::cout << db.get("show databases") << std::endl;
-
-        async_api.insert(line("test", key_value_pairs(), key_value_pairs("value", 41)));
-        api.insert(line("test", key_value_pairs(), key_value_pairs("value", 42)));
-
-        std::this_thread::sleep_for(std::chrono::milliseconds(101));
-
-        // {"results":[{"series":[{"columns":["time","value"],"name":"test","values":[["2016-10-28T22:11:22.8110348Z",42]]}]}]}
-        std::cout << db.get("select * from demo..test") << std::endl;
-
-        // or if the async call passes through:
-        // {"results":[{"series":[{"name":"test","columns":["time","value"],
-        //             "values":[["2016-12-09T20:24:18.8239801Z",42],["2016-12-09T20:24:18.9026688Z",41]]}]}]}
-
-        api.drop();
-
-        // multiple lines formatted for one synchronous call:
-        // multiple,v1=1i
-        // multiple,v2=2i
-        std::cout << line
-            ("multiple", key_value_pairs("v1", 1), key_value_pairs())
-            ("multiple", key_value_pairs("v2", 2), key_value_pairs())
-        .get() << std::endl;
-    }
-    catch (std::exception const& e)
-    {
-        std::cerr << e.what() << std::endl;
-    }
-
-    return 0;
+using namespace std;
+
+int main(int argc, char *argv[]) {
+	try {
+		int keyNum = 0;
+
+		influxdb::async_api::simple_db async_api("http://localhost:8086", "bluewhale");
+
+		struct timeval begin;
+		gettimeofday(&begin, NULL);
+
+		while (1) {
+			struct timeval tv,td;
+			gettimeofday(&tv, NULL);
+			long time = (long long) (tv.tv_sec) * 1000000000 + tv.tv_usec * 1000;
+
+			influxdb::api::key_value_pairs tags;
+			influxdb::api::key_value_pairs fields;
+			string g_app_name = "test";
+			string rankID = "1";
+			std::cout << "key num: " << keyNum << std::endl;
+			tags.add("appName", g_app_name);
+			tags.add("svrID", rankID);
+			fields.add("value", keyNum);
+			async_api.insert(line("t_lr_key", tags, fields));
+
+			gettimeofday(&td, NULL);
+			std::cout << "cost time " << (td.tv_sec - tv.tv_sec) * 1000000 + (td.tv_usec - tv.tv_usec) << std::endl;
+
+			std::cout << "current time " << (td.tv_sec - begin.tv_sec) / 60 << std::endl << std::endl;
+			keyNum++;
+			sleep(1);
+		}
+
+	}
+	catch (std::exception const &e) {
+		std::cerr << e.what() << std::endl;
+	}
+
+	return 0;
 }