Question

我对PHP和SQL比较陌生。我正在一个小型PHP网站上工作，该网站应该包含聊天功能。现在，我的数据库中有了一个名为“ friendchat”的表。它具有五列：收件人，发件人，消息，日期，消息ID。日期列来自日期时间类型，消息ID为A_I。因此，现在我写了以下PHP行，以将消息插入数据库。函数“ DB ::”包含在“ classes / DB.php”中。这种获取和插入数据的方法每次都对我有用，但是现在不行了：

    
<?php   
session_start();
include 'classes/DB.php'; 
if (isset($_POST['message-submit'])) { //activation of the send-button
    if(isset($_GET['userchat'])){ //this variable gets the name of the user you want to chat with which you could selected on the previous page
    
    $message = $_POST['message']; //gets the data from the textarea
    
    $receiver_id = DB::query('SELECT id FROM users WHERE username=:username', array(':username'=>$_GET['userchat'])[0]['id']);  //here i get the userid from the person i am chating to in order to be able to insert him in the friendchat table as receiver
    
    DB::query('INSERT INTO friendchat VALUES (:receiver, :sender, :message, \'\', \'\')', array(':receiver'=>$receiver_id, ':sender'=>$_SESSION['myid'], ':message'=>$_POST['message']));  //now the message,receiver, the sender, datetime and message-id will be inserted into the database
    
}else{
  echo "Unothorized access!";  //illegal access
}
}
?>

这是HTML表单代码：

<form action="index.php" method="POST" class="message-form">
      <input class="message" type="text" placeholder="message" name="message">
      <input class="submit" type="submit" name='message-submit' value="Send">
      </form> //form for getting the data from the website

因此，当我运行代码时，没有收到错误消息或任何通知，但数据不在我的数据库中。我不知道可能是什么问题。有人可以帮帮我吗？如果您需要任何其他信息，请询问我。

Answer 1

<?php   
session_start();
include 'classes/DB.php'; 
if (isset($_POST['message-submit'])) { //activation of the send-button
    if(isset($_GET['userchat'])){ //this variable gets the name of the user you want to chat with which you could selected on the previous page

$message = $_POST['message']; //gets the data from the textarea

$receiver_id = DB::query('SELECT id FROM users WHERE username=:username', array(':username'=>$_GET['userchat'])[0]['id']);  //here i get the userid from the person i am chating to in order to be able to insert him in the friendchat table as receiver



var_dump($receiver_id);

打印出$ receiver_id的值以进行调试

您是否获得了$ receiver_id的值，如果没有，请返回步骤var_dump并将'$ _GET ['userchat']）[0] ['id']）'

中包含的值

$returnValue = DB::query('INSERT INTO friendchat VALUES (:receiver, :sender, :message, \'\', \'\')', array(':receiver'=>$receiver_id, ':sender'=>$_SESSION['myid'], ':message'=>$_POST['message']));  //now the message,receiver, the sender, datetime and message-id will be inserted into the database

var_dump($returnValue);

保存查询结果并var_dump它。这样一来，您就可以查看插入后返回的是“ true”还是“ false”

die();

在此处停止代码，以便您可以在网络浏览器的网络标签（Chrome中为F12）中看到var_dump输出

如果到此为止却没有看到任何错误，请尝试使用上述变量中的确切值将插入查询写入phpmyadmin（直接写入数据库），如果出了问题，数据库应该给您一个更具体的错误从

}else{
  echo "Unothorized access!";  //illegal access
}
}
?>

SQL代码没有错误，但不会从数据库中获取数据

1 个答案: