顯示錯誤試圖獲取非對象的屬性

Question

$sensor = Yii::app()->zdb->createCommand("select * from tbl_sensor where stype=2 and nid=$nid order by timestamp desc limit 10")->queryAll(); 

if($sensor) 

{ return $sensor->sdata/10; } 

else 

{ return null; } 

Answer 1

QueryAll是返回數組。使用這樣

foreach($sensor as $key => $row) { 
    $yourvar = $row['sdata']; 
} 

Answer 2

QueryAll會給你的數據數組的數組..

要獲取所有列：

​​

得到公正SDATA：

$sdata_values = Yii::app()->zdb->createCommand("select sdata from tbl_sensor where stype=2 and nid=$nid order by timestamp desc limit 10")->queryColumn(); 
if($sdata_values) { 
    foreach($sdata_values as $sdata_value) { 
     echo $sdata_value/10; 
    } 
} 
else { 
    return null; 
}