Thanks, finally i understand. Need to set my local sql with the option 
parameter when starting GAE.

On Sunday, 16 February 2014 05:06:51 UTC+8, Christian Foster Howes wrote:
>
> did you invoke dev_appserver.py with the options to enable mysql?  there's 
> a couple of options that you must pass to dev_appserver to tell it to load 
> and connect to mysql for local emulation of google cloud sql.  i haven't 
> done it for a while so i don't remember the exact magic incantations....
>
> cfh
>
> On Wednesday, February 12, 2014 3:53:56 AM UTC-8, Juslin Guo wrote:
>>
>> Hi,
>>
>> Can anyone point me to any resource that show me how to use CloudSQL+GAE 
>> together with a local mysql development environment on mac..It can't seem 
>> to connect to the local mysql for development purposes.
>>
>> I did this: 
>>
>> if not request.env.web2py_runtime_gae:
>> db = DAL("mysql://root:123@localhost/testing") 
>> else:
>> db = DAL("google:sql://juslintest:data/testgae")
>> session.connect(request, response, db=db)
>>
>>
>> Error:
>>
>> RuntimeError("Failure to connect, tried %d times:\n%s" % (attempts, tb))
>> RuntimeError: Failure to connect, tried 5 times:
>>
>> RuntimeError: no driver available ('MySQLdb', 'pymysql', 'mysqlconnector')
>>
>

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