Asynchronous protocol or not?

[zhimin chen]

I don't quite understand the "Mysql Internals ClientServer Protocol" (http://forge.mysql.com/wiki/MySQL_Internals_ClientServer_Protocol#Command_Packet) well.

Suppose we have two following cases, I want to know which case is right.
1. request-response, request-response
In a certain connection, we can only send one request (I.E. "select * from users"), then wait for the response, then send another request.
(We can't send another request if the response for previous request was not ready)

2. request,request,request - response, response, response
In a certain connection, we can send multiple requests one by one, and the server will send back the responses one by one in the order of the requests.

Thanks