致命错误:在非对象上调用成员函数rowCount() [英] Fatal error: Call to a member function rowCount() on a non-object

问题描述

我在登录名中使用PDO(如先前在sqli上所指示的那样)，并且我尝试了以下操作，但是却遇到了致命错误，并且无法弄清楚给出什么，因此它满足该错误:

I'm using PDO in my login (as instructed previously over sqli), and I have tried the following, but yet I am getting this Fatal Error, and cannot figure out what to give it, so it satisfies the error:

if($query->rowCount() > 0) 
{
   // session stuff
   // refresh page
}

然后我尝试了这个:

if($query->rowCount() == 1) 
{
   // session stuff
   // refresh page
}

但是我仍然得到这个消息:致命错误:在非对象上调用成员函数rowCount()

Yet I still get this: Fatal error: Call to a member function rowCount() on a non-object

这是我在进行更改之前开始的内容:

Here's is what I started with before the changes:

$count = $query->rowCount();

最后，这是一个更好的代码段，因此您可以了解其中涉及的内容:

Lastly, here's a better snippet so you can get an idea of what's involved:

<?php
include("/scripts/Connections.php");

$email = $_POST['email'];
$username = $_POST['username'];
$password = md5($_POST['password'], "DDerehOjhdfDDf$$##%^)-=_/.#$#dkfsj!`~efjkf(*)/)sD");
$confPassword = md5($_POST['conPassword'], "DDerehOjhdfDDf$$##%^)-=_/.#$#dkfsj!`~efjkf(*)/)sD");

if(isset($email, $username, $password, $confPassword)) {
    if(strstr($email, "@")) {
        if($password == $confPassword) {
            $query = $dbc->prepare("SELECT * FROM members WHERE username = ? OR email = ?");
            $query = $query->execute(array(
            $username,
            $email
        ));

        $count = $query->rowCount();

        if($count == 0) {
            $query = $dbc->prepare("INSERT INTO memebers SET username = ?, email = ?, password = ?");
            $query = $query->execute(array(
                $username,
                $email,
                $password
            )); 
            if($query) {
                echo "Your account has been registered, you may login!";                
        }           
        }
        else {
            echo "A user already exists with that username/password.";
        }
    }
    else {
            echo "Your passwords do not match!";
        }
}
else {
            echo "Invalid email address!";
        }
    }           
?>

任何人都可以指出我在哪里出问题了.这是我抛出的唯一错误.

Can anyone point where I'm going wrong here. This is my only error this is being thrown.

推荐答案

您似乎正在用execute()中的布尔返回值覆盖$query，而给您留下了一个非对象值(布尔)尝试在其上调用方法.

You appear to be overwriting $query with the boolean return value from execute(), leaving you with a non-object value (boolean) which you're trying to call a method on.

尝试这样的事情:

if($password == $confPassword) {
    $query = $dbc->prepare("SELECT * FROM members WHERE username = ? OR email = ?");

    $result = $query->execute(array(
        $username,
        $email
    ));

    // check the value of $result is true here - if not,
    // your query has failed to execute and handle the error
    // appropriately.

    $count = $query->rowCount();

    // ...
}

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