public void printDB() {
		ArrayList<Test>tests = queryTests();
		for(Test test : tests) { 
			Gson gson = new Gson(); 
			String json = gson.toJson(test);
			System.out.println(json); 
		 }
		
		 ArrayList<TestDistance> tdistances = queryTestDistances();
		 for(TestDistance distances : tdistances) { 
			Gson gson = new Gson(); 
			String json = gson.toJson(distances);
			System.out.println(json); 
		 }
		 
		 ArrayList<TestReaction> treactions = queryTestReactions();
		 for(TestReaction reaction : treactions) { 
			Gson gson = new Gson(); 
			String json = gson.toJson(reaction);
			System.out.println(json); 
		 }
	}