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$QueryDef = $CQsession->BuildQuery('ABC');
$QueryDef->BuildField('recname');
...
$operator->BuildFilter("id", $CQ::CQ_COMP_OP_EQ, $rec);
$ResultSet = $CQsession->BuildResultSet($QueryDef);
$ResultSet->Execute();

   if (!$ResultSet) {
   }
...
         ......
   }