Hello Edi,
 Enclosing sql statement inside empty if gives same error:

if(User-Name){
        if("%{sql: UPDATE radacct set AcctStopTime=ADDDATE(AcctStartTime,INTERVAL AcctSessionTime SECOND), AcctTerminateCause='Clear-Stale Session' WHERE UserName='%{User-Name}' and CallingStationId='%{Calling-Station-Id}' and AcctStopTime is NULL}"){
        }
}
Sat Jan 15 07:43:33 2011 : Auth: Login OK: [test] (from client nagios port 0)
Sat Jan 15 07:44:47 2011 : Error: rlm_sql_mysql: MYSQL Error: No Fields
Sat Jan 15 07:44:47 2011 : Error: rlm_sql_mysql: MYSQL error:
Sat Jan 15 07:44:47 2011 : Info: rlm_sql_mysql: Starting connect to MySQL server for #3
Sat Jan 15 07:44:47 2011 : Error: rlm_sql (sql): failed after re-connect


On Fri, Jan 14, 2011 at 6:19 PM, Eddie Stassen <estassen@gmail.com> wrote:
On Fri, Jan 14, 2011 at 1:57 PM, Johan Meiring
<jmeiring@pcservices.co.za> wrote:
> On 2011/01/14 12:50 PM, Bishal Pun wrote:
>>
>> Alan,
>>
>>  While running that command in mysql it clear the session of user. But
>> with
>> radius unlang it is giving error in radius log.
>>
>
> I might be wrong, but as far as I know rlm_mysql expects something to come
> back from the query.
>
> Can't think of a solution though unless rlm_mysql will allow somehting like
>
> "%{sql: SELECT 1; UPDATE radacct set
> AcctStopTime=ADDDATE(AcctStartTime,INTERVAL
> AcctSessionTime SECOND), AcctTerminateCause='Clear-Stale Session' WHERE
> UserName='%{User-Name}' and CallingStationId='%{Calling-Station-Id}' and
> AcctStopTime is null}"
>
> --

Enclosing the UPDATE in an empty 'if' works:

if ("%{sql: UPDATE ...}") {
}

That prevents the rlm_sql_mysql module from looking for returned fields.

Eddie

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