What type of Visa should I get ?

I am a Canadian travelling from Canada to Germany in August 2013 with a stopover in Shanghai and change of planes for a 5 hours. Then I continue to Germany for 1 week and then return to Shanghai. ...
Do I need a multiple entry?
Should I get a multiple entry if I plan to again visit from Canada within the following 6-8 months ?
What Kind should I get ? 2 entry ? Multiple entry ?