How to retrieve data from anther table in one model

I wanna retrieve data from anther table in one model.
case is like this:
in a model,eg:StaticTable,I set $useTable as false;
so in one function,I just wanna get data from some table.how can I manage
it?
Here is my code,but it doese't work.
part of the code in app/Model/StaticTable.php:
class StaticTable extends Model{
public $useTable = false;
protected $_tableName = '';
public function get_some_data(){
$this->_tableName = 'tb_server_info';
$serverInfo = $this->find('all', array(
'conditions' => array('status'=>1),
'order'=>array('created_date'=>'asc')
));
$this->_tableName = 'tb_platform_info';
$platformInfo= $this->find('all', array(
'conditions' => array('status'=>1),
'order'=>array('created_date'=>'asc')
));
return
array('server_info'=>$serverInfo.'platform_info'=>$platformInfo);
}
}



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