About visa for Shanghai

Dear Sirs,

Greetings,,,

I would like to enquire s to visa requirements as i am planning a trip to Macao via Shanghai , and as there is no direct flight to/from my country of origin UAE it i am obligated to return via connecting flight from Shanghai .. Therefore .. Does my "single-entry" visa make me eligible ,within certin amount of time, to re-enter Shanghai on my return.

Or must i opt for a multi-entry visa for this return trip ..

Awaiting your kind response ..