Police Station Bureau, Z visa Inquiry

Hi. I just want to ask for help. I have a Chinese boyfriend and we are planning to get married here. I have Z type since I am working here but it will expire after a 2 months. My boyfriend wants to get married this month. My questions are:
1. If my company will renew my Z type, will they know that I'm already married? Will the PSB know it even though I will get marry at other province? Do you think it will reflect on the papers that I'm already married? Because I want to keep mum about it. I don't want to company to know that I'm already married due to personal reasons.
2. If we get a marriage certificate, are they going to stamp/stick something on my passport?
3. For instance I decided not renew my Z type anymore, how am I going to get a residence permit for my L type?

Thanks a lot for the help!