I am passing SQL queries as an object in my web app. I wish to do a test bed for testing those objects. Any logical idea or method for it?

I am passing queries in the form of object in my web app. Those objects are created with my own class definition. It will be converted to DB executable query strings. I wish to do a test bed which tests those query object. My present idea is to get the query objects from my old build and my new build and compare. I'm getting those objects by serializing them while application is running. But it makes the application very slow. Is there any method to achieve this?