can not write data into an sql table, - php

Question

I am trying to write some information into an SQL database from my website using PHP. I can access the database to login, however I can not write anything to it from my website. Also, I can not view any connection errors.
Form Page:
<?php
$dbh = new PDO('mysql:host='.$hostname.';dbname='.$dbname, $user, $pass);
if (!$dbh) { die('Could not connect: ' . mysql_error()); }else echo 'connected';echo '<br>';
if(isset($_COOKIE['username']))
?>
<div id="imagel">
<img class="imagel" src="../images/logos/logo2.jpg" width="300" height="300" alt="studio table" />
</div>
<div id="textr">
<form name="tableofevents" method="post" action="adminhome.php">
Name of Event(Maximum of 83 characters): <input type="text" name="noe"/>
<br>
Event Description (Maximum of 288 characters): <input type="text" name="eventdescription"/>
<br>
Date of Event: <input type="text" name="date"/>
<br>
Ticket Price: <input type="text" name="price"/>
<br>
<input type="submit" name="submit" text="submit"/>
</form>
Processing Page:
<?php
$hostname = 'localhost';
$user='******';
$pass='***********';
$dbname='sth420';
$handler = new PDO('mysql:host='.$hostname.';dbname='.$dbname,$user,$pass);
$dbh = mysql_connect ($hostname.';dbname='.$dbname, $user, $pass);
if (!$dbh) { die('Could not connect: ' . mysql_error()); }
else echo 'connected';echo '<br>';
if(isset($_COOKIE['username']))
{
$username=$_COOKIE['username'];
$password=$_COOKIE['password'];
$sql='SELECT * FROM Users WHERE ID=:id';
$results = $handler->prepare($sql);
$results->execute([':id' => $username]);
$row = $results->fetch();
if($row!=null)
{
$pword = $row['Password'];
if($pword == $password)
{
if(isset($_POST['submit']))
{
$noe=$_POST['noe'];
$ed=$_POST['eventdescription'];
$date=$_POST['date'];
$price=$_POST['price'];
$sql='INSERT INTO ismievents ( title, evtdesc, dandt, price ) VALUES(0, :noe, :eventdescription, :date, :price)';
mysql_error()
$results = $handler->prepare($sql);
$results->execute([':noe' => $noe, ':eventdescription' => $ed, ':date' => $date, ':price' => $price]);
$handler = null;
header('Location: events.html');
}
}
}
}
if (!mysql_query($sql,$dbh))
{
die('Error: ' . mysql_error());
}
echo "1 record added";
mysql_close($dbh);
require_once('adminhome.html');
?>

Answer 1

You are mixing PDO and mysql_connect(). That is invalid, as they are incompatible APIs. Remove all references to mysql_*() and stick only with your PDO statements. You have basically duplicated every PDO statement with an incorrect call to mysql_query() but you should have none of mysql_connect(), mysql_query(), mysql_error(), mysql_fetch_*().
Refer to the manual on PDO prepared statements to see the many examples.
I see a mismatch between column counts here. You list 4 columns, but the VALUES () list contains 5:
// Prepared statemetn looks ok...
$sql='INSERT INTO ismievents ( title, evtdesc, dandt, price ) VALUES(0, :noe, :eventdescription, :date, :price)';
// But this is meaningless here...
mysql_error()
I note also that you are using PHP 5.4 array literals like:
$results->execute([':noe' => $noe, ':eventdescription' => $ed, ':date' => $date, ':price' => $price]);
Hopefully you are actually running this code in PHP 5.4.
Really, you need to take this code back to the drawing board to purge it of the incompatibilities between PDO and mysql_*(). After that, you will be able to narrow down other problems with it.
A final note here, it is really inadvisable to store a password in $_COOKIE. On a successful login, instead store a logged in state in $_SESSION.