Replace clear global response string

test/test.cpp

@@ -13,7 +13,12 @@ int main() {
 
     auto res = mydb.query("Select * from Tab1");
 
-    cout << endl <<  res["NAME"][0];
+    for (auto i : res) 
+        for (auto j: i.second)
+            cout << i.first << " : " << j << endl;
+    
+
+    // cout << endl <<  res["NAME"][1];
 
     return 0;
 }