Question

面对以下错误

错误：注意：第120行的/Applications/XAMPP/xamppfiles/htdocs/mks/opencart-1.5.6.1/upload/admin/controller/catalog/vendhqbridge.php中的未定义索引：id

相关代码：

//check for existing 'VendHQ_id' on  DB's product table

function checkVendHQid($flagChk)
{
$rs = $this->db->query("SELECT vendhq_id as id FROM ".DB_PREFIX."vendhq_product WHERE vendhq_id = '".$flagChk."'");

     $rowRsl=-1;
     if($rs===null)
    {
        $rowRsl = -1;
    }
    else
    {
       if($rs->row["id"] == $flagChk  )
       {
           $rowRsl = 1;
       }
    }

    return $rowRsl;
 }

Answer 1

在FROM

之后加一个空格

$rs = $this->db->query("SELECT vendhq_id as id FROM ".DB_PREFIX."vendhq_product WHERE vendhq_id = '".$flagChk."'");

Answer 2

如Vikas Umrao和shadyyx所述，您应该更改查询和if条件，如下所示：

更改

 $rs = $this->db->query("SELECT vendhq_id as id FROM ".DB_PREFIX."vendhq_product WHERE vendhq_id = '".$flagChk."'");

 $rowRsl=-1;
 if($rs===null)

要

$rs = $this->db->query("SELECT vendhq_id as id FROM ".DB_PREFIX."vendhq_product WHERE vendhq_id = '".$this->db->escape($flagChk)."'"); $rowRsl=-1; if(!$rs->num_rows){

度过美好的一天!!

mysql select查询结果为null所以如何在php中返回默认值

2 个答案: