php中的更新表[关闭]

My bad.. had the name wrong.

But it still doesn't update, it says 0 records updated. It should be 1.

This is my input field :

<?php
if($_SESSION['admin'] > 0)
{

echo'<div id="registreer">';
echo'<div id="titel">update</div>';
echo'<form action="done.php" method="post">';
echo'<input type="text" name="regname" placeholder="username"  /> ';
echo'<input type="password" name="regpass" placeholder="password" />';
echo'<input type="text" name="regdbhost" placeholder="host"  /> ';
echo'<input type="text" name="regdbuser" placeholder="user"  /> ';
echo'<input type="text" name="regdbpass" placeholder="dbpass"  /> ';
echo'<input type="text" name="regdbname" placeholder="dbname"  /> ';
echo'<input type="text" name="regdbtable" placeholder="table"  /> ';
echo"<button type='submit' name='regsubmit' value='register'>";
echo'<p>UPDATE</p>'; 
echo'</button>';
echo'</form>     ';   
echo'</div>';
echo'<a href="hetwerkt.php">terug</a>';
}

else if($_SESSION['admin'] < 1)
{
header("Location: hetwerkt.php");
}
?>

When you click on UPDATE, it will send you to done.php

<?php
session_start();
?>

<?php

$servername = "----";
$username = "----";
$password = "----";
$dbname = "----";

$name = mysql_real_escape_string($_POST['regname']); 
$pass = mysql_real_escape_string($_POST['regpass']);
$regdbhost = $_POST['regdbhost'];
$regdbuser = $_POST['regdbuser'];
$regdbpass = $_POST['regdbpass'];
$regdbname = $_POST['regdbname'];
$regdbtable = $_POST['regdbtable'];

$pass = crypt($pass,'$2a$09$anexamplestringforsalt$');
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = "UPDATE info SET regdbname='$regdbname' WHERE id='".$id."'";

// Prepare statement
$stmt = $conn->prepare($sql);

// execute the query
$stmt->execute();

// echo a message to say the UPDATE succeeded
echo $stmt->rowCount() . " records UPDATED successfully";
}
catch(PDOException $e)
{
echo $sql . "<br>" . $e->getMessage();
}

$conn = null;
?>

And it shows this error :

 UPDATE info SET regdbname='test' WHERE id=''
 SQLSTATE[42S22]: Column not found: 1054 Unknown column 'regdbname' in 'field list'

What am I doing wrong? My regdbname table exist in info. Why does is say that regdbname is not found?

My bad it was user and not info

You have two issues:

1) Your table does not have column regdbname. Please check if column name is correct, also, if you are misspelling it.

2) $id is set blank. You are not setting $id anywhere.

The updatted records is 0. this is because you didn't even define the value for $id.

your query is like this

UPDATE user SET regdbname='test' WHERE id=''

so it searches for a empty id, at it have none it didn't update any row and return result as 0.