Problem "expand: %{Acct-Input-Gigawords} ->" always get nothing!

[snan4love]

Hello Everybody:
Thanks for opening this topic.
Right now,I have set up the FreeRadius+Mysql+Wifi system, I could get into
the internet via this system on my laptop.
But my problem is :
No matter how long i stay in the connection, the AcctInputOctets and
AcctOutPutOctets are always 0;
the debug information from radiusd -X mode regarding this issue is :

[sql] 	expand: %{User-Name} -> snan4love
[sql] sql_set_user escaped user --> 'snan4love'
[sql] 	expand: %{Acct-Input-Gigawords} -> 
[sql] 	... expanding second conditional
[sql] 	expand: %{Acct-Input-Octets} -> 
[sql] 	... expanding second conditional
[sql] 	expand: %{Acct-Output-Gigawords} -> 
[sql] 	... expanding second conditional
[sql] 	expand: %{Acct-Output-Octets} -> 
[sql] 	... expanding second conditional
[sql] 	expand: %{Acct-Delay-Time} -> 
[sql] 	... expanding second conditional
[sql] 	expand:            UPDATE radacct SET              acctstoptime      
= '%S',              acctsessiontime    = '%{Acct-Session-Time}',             
acctinputoctets    = '%{%{Acct-Input-Gigawords}:-0}' << 32 |                                  
'%{%{Acct-Input-Octets}:-0}',              acctoutputoctets   =
'%{%{Acct-Output-Gigawords}:-0}' << 32 |                                  
'%{%{Acct-Output-Octets}:-0}',              acctterminatecause =
'%{Acct-Terminate-Cause}',              acctstopdelay      =
'%{%{Acct-Delay-Time}:-0}',              connectinfo_stop   =
'%{Connect-Info}'           WHERE acctsessionid   = '%{Acct-Session-Id}'          
AND username          = '%{SQL-User-Name}'           AND nasipaddress      =
'%{NAS-IP-Address}' ->            UPDATE radacct SET             
acctstoptime       = '2011-09-27 15:45:35',              acctsessiontime   
= '1317',              acctinputoctets    = '0' << 32 |                                  
'0',              acctoutputoctets   = '0' << 32 |   

Every expand:%{Acct-Input-...} will get nothing.
I know,there must be misconfiguration I made, but I dont know where to fix
it.
Please help me, 
Thank you very much.

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