exception in subqueries

[Access-Dev]

Hi,

I m currently using mysqlpp in a MFC/Windows/C++ project , and I 
experiencing exceptions while calling sub queries:


Here is the error I get if I activate exceptions:

Unhandled exception at 0x75acb760 in UA_OnlineTracking.exe: Microsoft 
C++ exception: mysqlpp::BadQuery at memory location 00012ebc8..


My Code :


ITF::String GetSingleField(mysqlpp::Connection & c,const char *sql){

       ITF::String out = "";

       mysqlpp::Query query = c.query(sql);

       mysqlpp::Row row;

       if (mysqlpp::UseQueryResult res = query.use()) {

             row = res.fetch_row();
             out = MPP_TO_ITF_STRING( row.at(0) );

       }


       return out;


       }




Looks like the if statement is never ( query.use() ) is never excecuted 
, even if I run a very simple query like "SELECT 1;"

If there a specific way to handle subqueries?

Best Regards,

Nicolas