Question

我正在关注youtube教程，我收到此错误，因为我仍然是php的初学者，因此我不确定如何修复。你们能帮助我吗？我也在使用phpmyadmin。我会发布一些代码。

我的错误：

致命错误：未捕获PDOException：SQLSTATE [23000]：完整性约束违规：1452无法添加或更新子行：外键约束失败（socialnetwork。login_tokens，CONSTRAINT {{1}在D：\ xampp \ htdocs \ test \ classes \ DB.php中的FOREIGN KEY（login_tokens_ibfk_1）参考id（users））：14堆栈跟踪：＃0 D：\ xampp \ htdocs \ test \ classes \ DB.php（14）：PDOStatement-＆gt; execute（Array）＃1 D：\ xampp \ htdocs \ test \ login.php（19）：DB :: query（＆＃39; INSERT INTO log ...＆＃39;，Array）＃14 {main}在第14行的D：\ xampp \ htdocs \ test \ classes \ DB.php中抛出

我的login.php

id

我的DB.php

<?php
include('classes/DB.php');
if(isset($_POST['login'])){
$username = $_POST['username'];
$password = $_POST['password'];

if (DB::query('SELECT username FROM users WHERE username=:username', array(':username'=>$username))){

    if(password_verify($password, DB::query('SELECT password FROM users WHERE username=:username', array(':username'=>$username))[0]['password'])){
        echo 'Logged in!';

        $cstrong = True;
        $token = bin2hex(openssl_random_pseudo_bytes(64, $cstrong)); //generate a hex of random bytes for token

        $user_id = DB::query('SELECT id FROM users WHERE username=:username', array(':username'=>$username))[0]['id'];
        DB::query('INSERT INTO login_tokens VALUES (\'\', :token, :user_id)', array(':token'=>sha1($token), 'user_id'=>$user_id)); // passing token into user_id, uses sha1 to hash token for encryption

        //SNID variable meaning social network id, expires date, current time, seconds, mins, 1 day, 7 valid for 1 week, server / for everywhere, domain for where you are hosting, SSL - set to true if it is using ssl, http only 
        setcookie("SNID", $token, time() + 60 * 60 * 24 * 7, '/', NULL, NULL, TRUE);   

        //second cookie that will expire every 3 days. Ask for server for another cookie. Without them knowing and they dont have to log in/out. 
        setcookie("SNID_", '1', time() + 60 * 60 * 24 * 3, '/', NULL, NULL, TRUE); 


    }else{
        echo 'username or password is incorrect!';  
    }   
}else {
    echo 'User not registered!';    
}
}
?>

我的index.php

class DB{

private static function connect(){

    $pdo = new PDO('mysql:host=127.0.0.1;dbname=socialnetwork;charset=utf8', 'root', '');
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    return $pdo;
}

public static function query($query, $params = array()){
    $statement = self::connect()->prepare($query);
    $statement->execute($params);

    if (explode(' ', $query)[0] == 'SELECT'){

    $data = $statement->fetchAll();
    return $data;

    }

}

}

在我的phpMyAdmin的login_tokens中：

姓名：id 类型：整数（11）整理：属性：UNSIGNED 空：没有默认值：无额外：AUTO_INCREMENT 小学

名称：令牌类型：char（64）整理：latin1_swedish_ci 属性：空：没有默认值：无 Keyname：令牌独特：是的打包：没有列标记基数：0 整理：A 空：没有

名称：user_id 类型：整数（11）整理：属性：UNSIGNED 空：没有默认值：无

致命错误：未捕获PDOException：SQLSTATE [23000]：完整性约束违规：

0 个答案: