Problem at the time of popular elements in the database

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I was doing a chat project in php, with ajax, but my code does not insert anything into the database, but I have no idea what it is, and before they think I did not search, I already tried to bring the variable from js to php, but I could not, I tried to change the sql command, but neither was it. So I've come to ask for your help, it's not chewed, because I already did, that's just the problem. (The bank does not populate).

Thanks in advance for your attention.

index.php 

<!DOCTYPE html>

<html>

<head>
<meta charset="utf-8">

<title>Sistema de Chat</title>

<link rel="stylesheet" href="style.css"/>

<script src="https://code.jquery.com/jquery-3.3.1.js"integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60="
crossorigin="anonymous">

</script>

</head>

<body>

<?php
    session_start();
    $_SESSION['username'] = "Henrique Nunes";

?>

<div id="tela">
    <h1>Bem vindo ao chat</h1>

    <div class="tela_chat">

        <div id="chat">

        </div>

        <form method="POST">
            <textarea name="mensagem" cols="30" rows="7" class="textarea">

            </textarea>
        </form>

    </div>

</div>

<script>

    /*  -- JQUERY NO TEXTAREA --
        Essa parte o jquery vai pegar o número da tecla digitada
        e se o número for 13(enter) ele vai enviar
    */

    $('.textarea').keyup(function (e) {

        if ( e.which === 13 ){ //Se a tecla for igual a 13(enter)
           $('form').submit(); //Envie pra o formulário o que foi digitado
       }

    });

    $('form').submit(function () {

        var mensagem = $('.textarea').val();

        $.post('manipuladores/mensagens.php?
action=enviarMensagem&mensagem='+ mensagem, function (
            response
        ){

            alert(response);

        });

        return false;

    });

</script>



</body>


</html>

config.php 

<?php

$dbhost = 'localhost';
$dbnome = 'chat';
$dbusuario = 'root';
$dbsenha = '1234';

try{
    $db = new 
PDO("mysql:dbhost=$dbhost;dbname=$dbnome","$dbusuario","$dbsenha");
}catch ( PDOException $e){
    echo ("<label style='color:red;'> Erro: </label> ".$e->getMessage(). "
<br><p style='color:red;'>Recomenda-se buscar na internet o código do erro.
</p>");
}



?>

messages.php (inside the handlers folder) 

<?php

include_once ('../config.php');

switch ( $_REQUEST['action']){
case "enviarMensagem":

    //global $db;

    $comandoSQL = $db->prepare('INSERT INTO mensagens SET mensagem = ?');
    var_dump($comandoSQL);
    $comandoSQL->execute([$_REQUEST['mensagem']]);
    var_dump($comandoSQL);

break;
}

Database information     name: chat;     used table: messages;

Messages is made up of: 

id: PK, AI
usuario: VARCHAR(45)
mensagem: TEXT
data: TIMESTAMP
    
asked by anonymous 26.01.2018 / 05:15

2 answers

1

The error is in the constructor of class PDO . You are passing dbhost to indicate the database server, but the correct one is host . This way: 

$db = new PDO("mysql:dbname=$dbnome;host$dbhost","$dbusuario","$dbsenha");

Another thing, avoid passing the message via GET and then capture with the global variable $_REQUEST .

Use this way: 

$.post("manipuladores/mensagens.php?action=enviarMensagem", {
    mensagem: $('.textarea').val()
}, function(response) {
    alert(Response);
})

And in PHP you can capture it like this: 

$comandoSQL->execute([$_POST['mensagem']]);
    
26.01.2018 / 11:05
1

I think you're not entering the bank so: INSERT INTO mensagens SET mensagem = ? . Instead of SET use: INSERT INTO mensagens (mensagem) VALUES (:MENSAGEM); 

$comandoSQL = $db->prepare('INSERT INTO mensagens (mensagem) values (:MENSAGEM)');
$comandoSQL->bindParam(":MENSAGEM",$_REQUEST['mensagem']);
$comandoSQL->execute();
    
26.01.2018 / 20:17
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