Cache With Multiple Queries

How to using cache with this code:

config:




'cache'=>array(

'class'=>'CFileCache',

),



controller:




$table1 = $command -> select('*') -> from("{{table1}}") -> where('id=:wid', array(':wid' => $id)) -> queryRow();

$command -> reset();

$table2 = $command -> select('*') -> from("{{table2}}") -> where('id=:wid', array(':wid' => $id)) -> queryRow();

$command -> reset();