Question

所以我正在重建从mysql到PDO的链接生成功能，我遇到了问题。

    $sth = $resDB->prepare("SELECT count(*) FROM downloads WHERE downloadkey = '{$strKey}' LIMIT 1");
$arrCheck = $sth->fetchAll();
if($arrCheck['count(*)']){
    //key already in use
    return createKey();
}else{
    //key is OK
    return $strKey;
}

在此行之前一切顺利：if($arrCheck['count(*)'])

我收到如下错误：Undefined index: count(*)

我只是不知道如何将该行更改为PDO。你能救我吗？

Answer 1

使用别名来引用列

SELECT count(*) as cnt FROM ...

$arrCheck["cnt"]

Answer 2

使用别名

尝试此操作

$sth = $resDB->prepare("SELECT count(*) as count FROM downloads WHERE downloadkey = '{$strKey}' LIMIT 1");
$arrCheck = $sth->fetchAll();
if($arrCheck['count']){

未定义的索引：count（*）PDO

2 个答案: