$arr=array(
  "select"=>"username,password,email", //要查询的字段
  "condition"=>"username like '%6'", //查询条件
  "order"=>"id desc",
  "limit"=>5,
  "offset"=>1,
);
$info=$user->findAll($arr);

$criteria=new CDbCriteria();
$criteria->select="username,password,email";
$criteria->condition="username like '%1'";
$criteria->limit=5;
$criteria->order="id desc";
$criteria->offset=1;
$info=$user->findAll($criteria);