Cannot use object of type yiidbConnection as array

$pointLog = $conn->createCommand('select * from table1 where is_deleted = 0 AND id1 = :id1 AND id2 = :Id2',
    [":id1" => $Id1, ":id2" => $Id2])->queryAll();

　　如果少了这个 queryAll 就会报这种错误。因为不是一个结果集，后面的代码又会引用当做行来用，php 报错很奇葩。