Question

这是我的错误消息 致命错误：Call to a member function FetchRow() on a non-object in C:\AppServ\www\hfix\include\care_api_classes\class_mini_dental.php on line 749

这是代码：

if ($cc=='0'){$cc='1';} else{$cc='0';}

        $this->sql='SELECT `encounter_nr`,`article_item_number`,`dosage`,`price`  FROM `care_encounter_prescription` WHERE `bill_status` = "archived" AND `prescribe_date` = "'.$dt.'" ORDER BY encounter_nr ASC ';
        $this->result=$db->Execute($this->sql);
        $this->sql='SELECT DISTINCT(`encounter_nr`)  FROM `care_encounter_prescription` WHERE `bill_status` = "archived" AND `prescribe_date` = "'.$dt.'" ORDER BY encounter_nr ASC ';
        $this->newquery=$db->Execute($this->sql);
        $patients = $this->newquery->RecordCount();
        while($this->zrow = $this->result->FetchRow()){
              $this->sql = 'SELECT `unit_cost` FROM `care_tz_drugsandservices` WHERE `item_id` = '.$this->row[1];
              $this->lastquery=$db->Execute($this->sql);
              if ($vx = $this->lastquery->FetchRow()) $cost = $vx[0];
              else $cost = 0;

              $costs += $this->row[2]  * $cost;         # dosage * cost
              $income += $this->row[2] * $this->row[3]; # dosage * price
        }           }

Answer 1

假设文件C:\AppServ\www\hfix\include\care_api_classes\class_mini_dental.php的第749行在您的示例中引用此行...

    if($this->row=$this->result->FetchRow()){

那你的问题是$this->result不是一个对象。您在前一行分配$this->result，返回值为$db->Execute($this->sql)。因此，如果$db->Execute()返回除object之外的任何内容，则会出现该错误。我的猜测是$db->Execute()因某种原因无法执行查询，并返回boolean false或其他一些非对象值作为失败的指示。在盲目地使用它之前，你应该首先检查错误的返回值。

另见https://stackoverflow.com/a/12769983/1878262 [相关]

致命错误：在非对象上调用成员函数FetchRow（）

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