Hungarian passport holders transit in Shanghai. Do I need China visa for this?

Hello,
I am holding Hungarian passport. I just read that when you spend less than 48 hours in Shanghai (leaving the airport) you dont need any kind of visa. I will travel from Singapore to Shaghai and in 24 hours I will fly from Shanghai to Budapest. ( My country was on the exemption list). When I board in Singapore do I need to show my flight ticket between Shanghai to Budapest in order to prove that I am going to spend in Shanghai less than 24 hours? Thank you