php - 试图获取非对象代码点火器的属性

Question

我从两个不同的函数调用一个函数两次，但是对于其中一个函数，它说“试图获取非对象的属性”第一个功能是

$sql=$this->db->query("select * from gl_events where entry_id='$entry_id'");
if($sql->num_rows() > 0)
{
    $row3=$sql->row();
    $event_respond[] = 
        array(
            'entry_id'=>$row3->entry_id,
            'event_title'=>$row3->event_title,
            'location'=>$row3->event_loc_add_ln1,
            'location1'=>$row3->event_loc_add_ln2,
            'start'=>$row3->event_start_date,
            'start1'=>$row3->event_start_time,
            'created'=>$row3->user_id,
            'about'=>$row3->event_descr,
            'end'=>$row3->event_end_time,
            'end1' => $row3->event_end_time,
            'userid'=>$row3->user_id,
             //here the function goes to gl_get_att function and  
             //calls gl_getusername function,
            'attend'=>$this->gl_get_att($row3->entry_id),
             // here it calls gl_getusername function directly
            'username'=>$this->gl_getusername($row3->user_id)
       );
}

gl_get_att定义:

public function gl_get_att($entry_id)
{
    $query=$this->db->query("select * from gl_event_participants where event_id='$entry_id'");
    //echo "select * from gl_event_participants where event_id='$entry_id'";
    $row1=$query->row();
    foreach($query->result() as $row)
    {
        $data[]= array(
            'user_id'=>$row->user_id,
            'username'=>$this->gl_getusername($row->user_id)// here it calls get username function
        );
    }
    //print_r($data[1]);
    //print_r($data[0]);
    return $data;
}

gl_getusername定义:

public function  gl_getusername($user_id)
{
    $query=$this->db->query("select user_name from gl_user where user_id = '$user_id'");
    $row1=$query->row();
    //print_r($row1->user_name);
    return $row1->user_name; //This is line 396
}

现在对于 gl_get_att 它返回正确的值但是对于我直接调用它的第一个函数它不工作

error message: A PHP Error was encountered
Severity: Notice
Message: Trying to get property of non-object
Filename: events/gl_event_model.php
Line Number: 396

第396行标记在上面

这在周末不起作用后的周六工作正常!!!奇怪

Answer 1

您不是在检查 $query 是否有效，或者 $query->row() 是否返回一个对象。如果在数据库中找不到传入的 $entity_id，则会生成此错误。